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  25 </div>
  26 <div class="section">
  27 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  28 <a name="chrono.reference"></a><a class="link" href="reference.html" title="Reference">Reference </a>
  29 </h2></div></div></div>
  30 <div class="toc"><dl class="toc">
  31 <dt><span class="section"><a href="reference.html#chrono.reference.chrono_include_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">include</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  32 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x">Included on the C++11 Recommendation</a></span></dt>
  33 <dt><span class="section"><a href="reference.html#chrono.reference.io_v1">Chrono I/O V1</a></span></dt>
  34 <dt><span class="section"><a href="reference.html#chrono.reference.io">Chrono I/O V2</a></span></dt>
  35 <dt><span class="section"><a href="reference.html#chrono.reference.round">Chrono Rounding Utilities</a></span></dt>
  36 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks">Other Clocks</a></span></dt>
  37 </dl></div>
  38 <p>
  39       As <code class="computeroutput"><span class="keyword">constexpr</span></code> will not be supported
  40       by some compilers, it is replaced in the code by <code class="computeroutput"><span class="identifier">BOOST_CONSTEXPR</span></code>
  41       for <code class="computeroutput"><span class="keyword">constexpr</span></code> functions and <code class="computeroutput"><span class="identifier">BOOST_STATIC_CONSTEXPR</span></code> for struct/class static
  42       fields. The same applies to <code class="computeroutput"><span class="identifier">noexecpt</span></code>
  43       which is replaced by <code class="computeroutput"><span class="keyword">noexcept</span></code>
  44       in the code.
  45     </p>
  46 <p>
  47       The documentation doesn't use these macros.
  48     </p>
  49 <div class="section">
  50 <div class="titlepage"><div><div><h3 class="title">
  51 <a name="chrono.reference.chrono_include_hpp"></a><a class="link" href="reference.html#chrono.reference.chrono_include_hpp" title="Header &lt;boost/chrono/include.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">include</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
  52 </h3></div></div></div>
  53 <p>
  54         Include all the chrono header files.
  55       </p>
  56 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  57 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  58 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">process_cpu_clocks</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  59 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">thread_clocks</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  60 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">ceil</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  61 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">floor</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  62 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">round</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  63 </pre>
  64 </div>
  65 <div class="section">
  66 <div class="titlepage"><div><div><h3 class="title">
  67 <a name="chrono.reference.cpp0x"></a><a class="link" href="reference.html#chrono.reference.cpp0x" title="Included on the C++11 Recommendation">Included on the C++11 Recommendation</a>
  68 </h3></div></div></div>
  69 <div class="toc"><dl class="toc">
  70 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.chrono_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  71 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  72 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">duration</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  73 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.clock"><code class="computeroutput"><span class="identifier">Clock</span></code>
  74         Requirements</a></span></dt>
  75 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.trivial_clock"><code class="computeroutput"><span class="identifier">TrivialClock</span></code> Requirements</a></span></dt>
  76 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.ecclock"><code class="computeroutput"><span class="identifier">EcClock</span></code>
  77         Requirements</a></span></dt>
  78 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.time_point_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">time_point</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  79 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.system_clocks_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">system_clocks</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  80 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.clock_strings_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">clock_strings</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  81 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.chrono_typeof_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">typeof</span><span class="special">/</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
  82 </dl></div>
  83 <div class="section">
  84 <div class="titlepage"><div><div><h4 class="title">
  85 <a name="chrono.reference.cpp0x.chrono_hpp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_hpp" title="Header &lt;boost/chrono.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
  86 </h4></div></div></div>
  87 <p>
  88           Include only the standard files.
  89         </p>
  90 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  91 </pre>
  92 </div>
  93 <div class="section">
  94 <div class="titlepage"><div><div><h4 class="title">
  95 <a name="chrono.reference.cpp0x.chrono_chrono_hpp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp" title="Header &lt;boost/chrono/chrono.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
  96 </h4></div></div></div>
  97 <div class="toc"><dl class="toc">
  98 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.limitations">Limitations
  99           and Extensions</a></span></dt>
 100 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf">Configuration
 101           Macros</a></span></dt>
 102 </dl></div>
 103 <p>
 104           Include only the standard files.
 105         </p>
 106 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">duration</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 107 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">time_point</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 108 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">system_clocks</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 109 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">typeof</span><span class="special">/</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 110 </pre>
 111 <div class="section">
 112 <div class="titlepage"><div><div><h5 class="title">
 113 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.limitations"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.limitations" title="Limitations and Extensions">Limitations
 114           and Extensions</a>
 115 </h5></div></div></div>
 116 <p>
 117             At present, there is no know limitation respect to the C++11 standard.
 118           </p>
 119 <p>
 120             The current implementation provides in addition:
 121           </p>
 122 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 123 <li class="listitem">
 124                 clock error handling as specified in <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3135.html#935" target="_top">clock
 125                 error handling needs to be specified</a>.
 126               </li>
 127 <li class="listitem">
 128                 process and thread clocks.
 129               </li>
 130 </ul></div>
 131 </div>
 132 <div class="section">
 133 <div class="titlepage"><div><div><h5 class="title">
 134 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.conf"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf" title="Configuration Macros">Configuration
 135           Macros</a>
 136 </h5></div></div></div>
 137 <div class="section">
 138 <div class="titlepage"><div><div><h6 class="title">
 139 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.conf.assert"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf.assert" title="How Assert Behaves?">How
 140             Assert Behaves?</a>
 141 </h6></div></div></div>
 142 <p>
 143               When <code class="computeroutput"><span class="identifier">BOOST_NO_CXX11_STATIC_ASSERT</span></code>
 144               is defined, the user can select the way static assertions are reported.
 145               Define
 146             </p>
 147 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 148 <li class="listitem">
 149                   <code class="computeroutput"><span class="identifier">BOOST_CHRONO_USES_STATIC_ASSERT</span></code>:
 150                   define it if you want to use Boost.StaticAssert.
 151                 </li>
 152 <li class="listitem">
 153                   <code class="computeroutput"><span class="identifier">BOOST_CHRONO_USES_MPL_ASSERT</span></code>:
 154                   define it if you want to use Boost.MPL static assertions.
 155                 </li>
 156 <li class="listitem">
 157                   <code class="computeroutput"><span class="identifier">BOOST_CHRONO_USES_ARRAY_ASSERT</span></code>:
 158                   define it if you want to use internal static assertions.
 159                 </li>
 160 </ul></div>
 161 <p>
 162               The default behavior is as <code class="computeroutput"><span class="identifier">BOOST_CHRONO_USES_ARRAY_ASSERT</span></code>
 163               was defined.
 164             </p>
 165 <p>
 166               When <code class="computeroutput"><span class="identifier">BOOST_CHRONO_USES_MPL_ASSERT</span></code>
 167               is not defined the following symbols are defined as
 168             </p>
 169 <pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_CHRONO_A_DURATION_REPRESENTATION_CAN_NOT_BE_A_DURATION</span> <span class="special">\</span>
 170     <span class="string">"A duration representation can not be a duration"</span>
 171 <span class="preprocessor">#define</span> <span class="identifier">BOOST_CHRONO_SECOND_TEMPLATE_PARAMETER_OF_DURATION_MUST_BE_A_STD_RATIO</span> <span class="special">\</span>
 172     <span class="string">"Second template parameter of duration must be a boost::ratio"</span>
 173 <span class="preprocessor">#define</span> <span class="identifier">BOOST_CHRONO_DURATION_PERIOD_MUST_BE_POSITIVE</span> <span class="special">\</span>
 174     <span class="string">"duration period must be positive"</span>
 175 <span class="preprocessor">#define</span> <span class="identifier">BOOST_CHRONO_SECOND_TEMPLATE_PARAMETER_OF_TIME_POINT_MUST_BE_A_BOOST_CHRONO_DURATION</span> <span class="special">\</span>
 176     <span class="string">"Second template parameter of time_point must be a boost::chrono::duration"</span>
 177 </pre>
 178 <p>
 179               Depending on the static assertion used system you will have an hint
 180               of the failing assertion either through the symbol or through the text.
 181             </p>
 182 </div>
 183 <div class="section">
 184 <div class="titlepage"><div><div><h6 class="title">
 185 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.conf.no_hybrid"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf.no_hybrid" title="Don't provide Hybrid Error Handling">Don't
 186             provide Hybrid Error Handling</a>
 187 </h6></div></div></div>
 188 <p>
 189               When <code class="computeroutput"><span class="identifier">BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING</span></code>
 190               is defined the lib don't provides the hybrid error handling prototypes:
 191             </p>
 192 <pre class="programlisting"><span class="identifier">Clock</span><span class="special">::</span><span class="identifier">time_point</span> <span class="identifier">Clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">(</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span><span class="identifier">ec</span><span class="special">=</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">throws</span><span class="special">());</span>
 193 </pre>
 194 <p>
 195               This allow to be closer to the standard and to avoid the Boost.System
 196               dependency, making possible to have Boost.Chrono as a header-only library.
 197             </p>
 198 <p>
 199               By default <code class="computeroutput"><span class="identifier">BOOST_CHRONO_PROVIDE_HYBRID_ERROR_HANDLING</span></code>
 200               is defined.
 201             </p>
 202 </div>
 203 <div class="section">
 204 <div class="titlepage"><div><div><h6 class="title">
 205 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.conf.header_only"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf.header_only" title="How to Build Boost.Chrono as a Header Only Library?">How
 206             to Build Boost.Chrono as a Header Only Library?</a>
 207 </h6></div></div></div>
 208 <p>
 209               When <code class="computeroutput"><span class="identifier">BOOST_CHRONO_HEADER_ONLY</span></code>
 210               is defined the lib is header-only.
 211             </p>
 212 <p>
 213               If in addition <code class="computeroutput"><span class="identifier">BOOST_USE_WINDOWS_H</span></code>
 214               is defined <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">windows</span><span class="special">.</span><span class="identifier">h</span><span class="special">&gt;</span></code> is included, otherwise files in
 215               <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">detail</span><span class="special">/</span><span class="identifier">win</span></code> are used to reduce the impact
 216               of including <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">windows</span><span class="special">.</span><span class="identifier">h</span><span class="special">&gt;</span></code>.
 217             </p>
 218 <p>
 219               However, you will either need to define <code class="computeroutput"><span class="identifier">BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING</span></code>
 220               or link with Boost.System.
 221             </p>
 222 </div>
 223 <div class="section">
 224 <div class="titlepage"><div><div><h6 class="title">
 225 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.conf.deprecated_io"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf.deprecated_io" title="Deprecated IO">Deprecated
 226             IO</a>
 227 </h6></div></div></div>
 228 <p>
 229               Version 2.0.0 deprecates the preceding IO features.
 230             </p>
 231 <p>
 232               However the default version is always version 1. If you don't want
 233               to include the deprecated features you could define <code class="computeroutput"><span class="identifier">BOOST_CHRONO_DONT_PROVIDES_DEPRECATED_IO_SINCE_V2_0_0</span></code>.
 234             </p>
 235 </div>
 236 <div class="section"><div class="titlepage"><div><div><h6 class="title">
 237 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.conf.system_clock_time_point"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf.system_clock_time_point" title="time_point&lt;system_clock,D&gt; specialization limitation">time_point&lt;system_clock,D&gt;
 238             specialization limitation</a>
 239 </h6></div></div></div></div>
 240 <div class="section">
 241 <div class="titlepage"><div><div><h6 class="title">
 242 <a name="chrono.reference.cpp0x.chrono_chrono_hpp.conf.version"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_chrono_hpp.conf.version" title="Version">Version</a>
 243 </h6></div></div></div>
 244 <p>
 245               <code class="computeroutput"><span class="identifier">BOOST_CHRONO_VERSION</span></code>
 246               defines the Boost.Chrono version. The default version is 1. In this
 247               case the following breaking or extending macros are defined if the
 248               opposite is not requested:
 249             </p>
 250 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
 251                   <code class="computeroutput"><span class="identifier">BOOST_CHRONO_PROVIDES_DEPRECATED_IO_SINCE_V2_0_0</span></code>
 252                 </li></ul></div>
 253 <p>
 254               The user can request the version 2 by defining <code class="computeroutput"><span class="identifier">BOOST_CHRONO_VERSION</span></code>
 255               to 2. In this case the following breaking or extending macros are defined
 256               if the opposite is not requested:
 257             </p>
 258 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
 259                   Breaking change <code class="computeroutput"><span class="identifier">BOOST_CHRONO_DONT_PROVIDES_DEPRECATED_IO_SINCE_V2_0_0</span>
 260                   </code>
 261                 </li></ul></div>
 262 <p>
 263               The default value for <code class="computeroutput"><span class="identifier">BOOST_CHRONO_VERSION</span></code>
 264               will be changed to 2 since Boost 1.55.
 265             </p>
 266 </div>
 267 </div>
 268 </div>
 269 <div class="section">
 270 <div class="titlepage"><div><div><h4 class="title">
 271 <a name="chrono.reference.cpp0x.duration_hpp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp" title="Header &lt;boost/chrono/duration.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">duration</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
 272 </h4></div></div></div>
 273 <div class="toc"><dl class="toc">
 274 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp.traits">Time-related
 275           Traits</a></span></dt>
 276 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp.common_type_spe"><code class="computeroutput"><span class="identifier">common_type</span></code> Specialization</a></span></dt>
 277 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp.duration">Class
 278           Template <code class="computeroutput"><span class="identifier">duration</span><span class="special">&lt;&gt;</span></code></a></span></dt>
 279 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp.arith"><code class="computeroutput"><span class="identifier">duration</span></code> Non-Member Arithmetic</a></span></dt>
 280 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp"><code class="computeroutput"><span class="identifier">duration</span></code> Non-Member Comparaisons</a></span></dt>
 281 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_cast">Non-Member
 282           Function <code class="computeroutput"><span class="identifier">duration_cast</span><span class="special">(</span><span class="identifier">duration</span><span class="special">)</span></code></a></span></dt>
 283 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs"><code class="computeroutput"><span class="identifier">duration</span></code> typedefs</a></span></dt>
 284 </dl></div>
 285 <p>
 286           This file contains duration specific classes and non-member functions.
 287         </p>
 288 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 289   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
 290
 291     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span> <span class="special">=</span> <code class="computeroutput"><span class="identifier">ratio</span></code><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;</span> <span class="special">&gt;</span>  <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">;</span>
 292
 293   <span class="special">}</span>
 294   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 295   <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.common_type_spe" title="common_type Specialization"><code class="computeroutput"><span class="identifier">common_type</span></code></a><span class="special">&lt;</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span>
 296                      <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
 297
 298   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
 299
 300     <span class="comment">// customization traits</span>
 301     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.treat_as_floating_point" title="Metafunction treat_as_floating_point&lt;&gt;"><code class="computeroutput"><span class="identifier">treat_as_floating_point</span></code></a><span class="special">;</span>
 302     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code></a><span class="special">;</span>
 303
 304     <span class="comment">// duration arithmetic</span>
 305     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 306     <span class="keyword">constexpr</span>
 307     <span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
 308     <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_plus_1" title="Non-Member Function operator+(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">+</span></code></a><span class="special">(</span>
 309         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 310         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 311
 312     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 313     <span class="keyword">constexpr</span>
 314     <span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
 315     <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_minus_1" title="Non-Member Function operator-(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">-</span></code></a><span class="special">(</span>
 316         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 317         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 318
 319     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
 320     <span class="keyword">constexpr</span>
 321     <span class="identifier">duration</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 322     <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_mult_1" title="Non-Member Function operator*(duration,Rep1)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">*</span></code></a><span class="special">(</span>
 323         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">,</span>
 324         <span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">);</span>
 325
 326     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
 327     <span class="keyword">constexpr</span>
 328     <span class="identifier">duration</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 329     <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_mult_2" title="Non-Member Function operator*(Rep1,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">*</span></code></a><span class="special">(</span>
 330         <span class="keyword">const</span> <span class="identifier">Rep1</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span>
 331         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 332
 333     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
 334     <span class="keyword">constexpr</span>
 335     <span class="identifier">duration</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 336     <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_2" title="Non-Member Function operator/(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">/</span></code></a><span class="special">(</span>
 337         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">,</span>
 338         <span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">);</span>
 339
 340     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 341     <span class="keyword">constexpr</span>
 342     <span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span>
 343     <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_3" title="Non-Member Function operator/(Rep1,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">/</span></code></a><span class="special">(</span>
 344         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 345         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 346
 347     <span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CHRONO_EXTENSIONS</span>
 348     <span class="comment">// Used to get frequency of events</span>
 349     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 350     <span class="keyword">constexpr</span>
 351     <span class="keyword">double</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_1" title="Non-Member Function operator/(duration,Rep2)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">/</span></code></a><span class="special">(</span>
 352         <span class="keyword">const</span> <span class="identifier">Rep1</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span>
 353         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 354     <span class="preprocessor">#endif</span>
 355
 356     <span class="comment">// duration comparisons</span>
 357     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 358     <span class="keyword">constexpr</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_eq_1" title="Non-Member Function operator==(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">==</span></code></a><span class="special">(</span>
 359         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 360         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 361
 362     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 363     <span class="keyword">constexpr</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_neq_1" title="Non-Member Function operator!=(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">!=</span></code></a><span class="special">(</span>
 364         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 365         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 366
 367     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 368     <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">__duration__op_le_1</span><span class="special">(</span>
 369         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 370         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 371     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 372     <span class="keyword">constexpr</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_leq_1" title="Non-Member Function operator&lt;=(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;=</span></code></a><span class="special">(</span>
 373         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 374         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 375
 376     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 377     <span class="keyword">constexpr</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_gt_1" title="Non-Member Function operator&gt;(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;</span></code></a><span class="special">(</span>
 378         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 379         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 380     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 381     <span class="keyword">constexpr</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_geq_1" title="Non-Member Function operator&gt;=(duration,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;=</span></code></a><span class="special">(</span>
 382         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
 383         <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 384
 385     <span class="comment">// duration_cast</span>
 386
 387     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">ToDuration</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 388     <span class="keyword">constexpr</span>
 389     <span class="identifier">ToDuration</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_cast" title="Non-Member Function duration_cast(duration)"><code class="computeroutput"><span class="identifier">duration_cast</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 390
 391     <span class="comment">// convenience typedefs</span>
 392     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">,</span> <span class="identifier">nano</span><span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">nanoseconds</span></code></a><span class="special">;</span>    <span class="comment">// at least 64 bits needed</span>
 393     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">,</span> <span class="identifier">micro</span><span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">microseconds</span></code></a><span class="special">;</span>  <span class="comment">// at least 55 bits needed</span>
 394     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">,</span> <span class="identifier">milli</span><span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">milliseconds</span></code></a><span class="special">;</span>  <span class="comment">// at least 45 bits needed</span>
 395     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">seconds</span></code></a><span class="special">;</span>              <span class="comment">// at least 35 bits needed</span>
 396     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least32_t</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span> <span class="number">60</span><span class="special">&gt;</span> <span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">minutes</span></code></a><span class="special">;</span> <span class="comment">// at least 29 bits needed</span>
 397     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least32_t</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">3600</span><span class="special">&gt;</span> <span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">hours</span></code></a><span class="special">;</span>  <span class="comment">// at least 23 bits needed</span>
 398
 399   <span class="special">}</span>
 400 <span class="special">}</span>
 401 </pre>
 402 <div class="section">
 403 <div class="titlepage"><div><div><h5 class="title">
 404 <a name="chrono.reference.cpp0x.duration_hpp.traits"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits" title="Time-related Traits">Time-related
 405           Traits</a>
 406 </h5></div></div></div>
 407 <div class="section">
 408 <div class="titlepage"><div><div><h6 class="title">
 409 <a name="chrono.reference.cpp0x.duration_hpp.traits.treat_as_floating_point"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.treat_as_floating_point" title="Metafunction treat_as_floating_point&lt;&gt;">Metafunction
 410             <code class="computeroutput"><span class="identifier">treat_as_floating_point</span><span class="special">&lt;&gt;</span></code></a>
 411 </h6></div></div></div>
 412 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">treat_as_floating_point</span>
 413     <span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_floating_point</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="special">{};</span>
 414 </pre>
 415 <p>
 416               The <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> template uses the
 417               <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.treat_as_floating_point" title="Metafunction treat_as_floating_point&lt;&gt;"><code class="computeroutput"><span class="identifier">treat_as_floating_point</span></code></a> trait
 418               to help determine if a <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> with one tick period
 419               can be converted to another <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> with a different
 420               tick period. If <code class="computeroutput"><span class="identifier">treat_as_floating_point</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;::</span><span class="identifier">value</span></code>
 421               is <code class="computeroutput"><span class="keyword">true</span></code>, then <code class="computeroutput"><span class="identifier">Rep</span></code> is a floating-point type and
 422               implicit conversions are allowed among <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>s. Otherwise, the
 423               implicit convertibility depends on the tick periods of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>s. If <code class="computeroutput"><span class="identifier">Rep</span></code> is a class type which emulates
 424               a floating-point type, the author of <code class="computeroutput"><span class="identifier">Rep</span></code>
 425               can specialize <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.treat_as_floating_point" title="Metafunction treat_as_floating_point&lt;&gt;"><code class="computeroutput"><span class="identifier">treat_as_floating_point</span></code></a> so
 426               that <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> will treat this
 427               <code class="computeroutput"><span class="identifier">Rep</span></code> as if it were a
 428               floating-point type. Otherwise <code class="computeroutput"><span class="identifier">Rep</span></code>
 429               is assumed to be an integral type, or a class emulating an integral
 430               type.
 431             </p>
 432 </div>
 433 <div class="section">
 434 <div class="titlepage"><div><div><h6 class="title">
 435 <a name="chrono.reference.cpp0x.duration_hpp.traits.duration_values"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values">Class
 436             Template <code class="computeroutput"><span class="identifier">duration_values</span></code></a>
 437 </h6></div></div></div>
 438 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
 439 <span class="keyword">struct</span> <span class="identifier">duration_values</span>
 440 <span class="special">{</span>
 441 <span class="keyword">public</span><span class="special">:</span>
 442     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">Rep</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values.zero" title="Static Member Function zero()"><code class="computeroutput"><span class="identifier">zero</span></code></a><span class="special">();</span>
 443     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">Rep</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values.max" title="Static Member Function max()"><code class="computeroutput"><span class="identifier">max</span></code></a><span class="special">();</span>
 444     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">Rep</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values.min" title="Static Member Function min()"><code class="computeroutput"><span class="identifier">min</span></code></a><span class="special">();</span>
 445 <span class="special">};</span>
 446 </pre>
 447 <p>
 448               The <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> template uses the
 449               <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code></a> trait to construct
 450               special values of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>'s representation
 451               (<code class="computeroutput"><span class="identifier">Rep</span></code>). This is done
 452               because the representation might be a class type with behavior which
 453               requires some other implementation to return these special values.
 454               In that case, the author of that class type should specialize <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code></a> to return
 455               the indicated values.
 456             </p>
 457 <div class="section">
 458 <div class="titlepage"><div><div><h6 class="title">
 459 <a name="chrono.reference.cpp0x.duration_hpp.traits.duration_values.zero"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values.zero" title="Static Member Function zero()">Static
 460               Member Function <code class="computeroutput"><span class="identifier">zero</span><span class="special">()</span></code></a>
 461 </h6></div></div></div>
 462 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">Rep</span> <span class="identifier">zero</span><span class="special">();</span>
 463 </pre>
 464 <p>
 465                 <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">Rep</span><span class="special">(</span><span class="number">0</span><span class="special">)</span></code>. <span class="bold"><strong>Note:</strong></span>
 466                 <code class="computeroutput"><span class="identifier">Rep</span><span class="special">(</span><span class="number">0</span><span class="special">)</span></code>
 467                 is specified instead of <code class="computeroutput"><span class="identifier">Rep</span><span class="special">()</span></code> since <code class="computeroutput"><span class="identifier">Rep</span><span class="special">()</span></code> may have some other meaning, such
 468                 as an uninitialized value.
 469               </p>
 470 <p>
 471                 <span class="bold"><strong>Remarks:</strong></span> The value returned corresponds
 472                 to the additive identity.
 473               </p>
 474 </div>
 475 <div class="section">
 476 <div class="titlepage"><div><div><h6 class="title">
 477 <a name="chrono.reference.cpp0x.duration_hpp.traits.duration_values.max"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values.max" title="Static Member Function max()">Static
 478               Member Function <code class="computeroutput"><span class="identifier">max</span><span class="special">()</span></code></a>
 479 </h6></div></div></div>
 480 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">Rep</span> <span class="identifier">max</span><span class="special">();</span>
 481 </pre>
 482 <p>
 483                 <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;::</span><span class="identifier">max</span><span class="special">()</span></code>.
 484               </p>
 485 <p>
 486                 <span class="bold"><strong>Remarks:</strong></span> The value returned compares
 487                 greater than zero().
 488               </p>
 489 </div>
 490 <div class="section">
 491 <div class="titlepage"><div><div><h6 class="title">
 492 <a name="chrono.reference.cpp0x.duration_hpp.traits.duration_values.min"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values.min" title="Static Member Function min()">Static
 493               Member Function <code class="computeroutput"><span class="identifier">min</span><span class="special">()</span></code></a>
 494 </h6></div></div></div>
 495 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">Rep</span> <span class="identifier">min</span><span class="special">();</span>
 496 </pre>
 497 <p>
 498                 <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;::</span><span class="identifier">lowest</span><span class="special">()</span></code>.
 499               </p>
 500 <p>
 501                 <span class="bold"><strong>Remarks:</strong></span> The value returned compares
 502                 less than or equal to <code class="computeroutput"><span class="identifier">zero</span><span class="special">()</span></code>.
 503               </p>
 504 </div>
 505 </div>
 506 </div>
 507 <div class="section">
 508 <div class="titlepage"><div><div><h5 class="title">
 509 <a name="chrono.reference.cpp0x.duration_hpp.common_type_spe"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.common_type_spe" title="common_type Specialization"><code class="computeroutput"><span class="identifier">common_type</span></code> Specialization</a>
 510 </h5></div></div></div>
 511 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 512 <span class="keyword">struct</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;</span>
 513 <span class="special">{</span>
 514     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="emphasis"><em>see bellow</em></span><span class="special">&gt;</span> <span class="identifier">type</span><span class="special">;</span>
 515 <span class="special">};</span>
 516 </pre>
 517 <p>
 518             The period of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> indicated by this specialization
 519             of <code class="computeroutput"><span class="identifier">common_type</span></code> is the
 520             greatest common divisor of <code class="computeroutput"><span class="identifier">Period1</span></code>
 521             and <code class="computeroutput"><span class="identifier">Period2</span></code>. This can
 522             be computed by forming a <code class="computeroutput"><span class="identifier">ratio</span></code>
 523             of the greatest common divisor of <code class="computeroutput"><span class="identifier">Period1</span><span class="special">::</span><span class="identifier">num</span></code>
 524             and <code class="computeroutput"><span class="identifier">Period2</span><span class="special">::</span><span class="identifier">num</span></code>, and the least common multiple
 525             of <code class="computeroutput"><span class="identifier">Period1</span><span class="special">::</span><span class="identifier">den</span></code> and <code class="computeroutput"><span class="identifier">Period2</span><span class="special">::</span><span class="identifier">den</span></code>.
 526           </p>
 527 <p>
 528             <span class="bold"><strong>Note:</strong></span> The typedef type is the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> with the largest tick
 529             period possible where both <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> arguments will convert
 530             to it without requiring a division operation. The representation of this
 531             type is intended to be able to hold any value resulting from this conversion,
 532             with the possible exception of round-off error when floating-point <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>s are involved (but
 533             not truncation error).
 534           </p>
 535 </div>
 536 <div class="section">
 537 <div class="titlepage"><div><div><h5 class="title">
 538 <a name="chrono.reference.cpp0x.duration_hpp.duration"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;">Class
 539           Template <code class="computeroutput"><span class="identifier">duration</span><span class="special">&lt;&gt;</span></code></a>
 540 </h5></div></div></div>
 541 <p>
 542             A <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> measures time between
 543             two points in time (<a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>). A <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> has a representation
 544             which holds a count of ticks, and a tick period. The tick period is the
 545             amount of time which occurs from one tick to another in units of a second.
 546             It is expressed as a rational constant using <code class="computeroutput"><span class="identifier">ratio</span></code>.
 547           </p>
 548 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
 549
 550     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 551     <span class="keyword">class</span> <span class="identifier">duration</span> <span class="special">{</span>
 552     <span class="keyword">public</span><span class="special">:</span>
 553         <span class="keyword">typedef</span> <span class="identifier">Rep</span> <span class="identifier">rep</span><span class="special">;</span>
 554         <span class="keyword">typedef</span> <span class="identifier">Period</span> <span class="identifier">period</span><span class="special">;</span>
 555     <span class="keyword">private</span><span class="special">:</span>
 556         <span class="identifier">rep</span> <span class="identifier">rep_</span><span class="special">;</span> <span class="comment">// exposition only</span>
 557     <span class="keyword">public</span><span class="special">:</span>
 558         <span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.duration_c_0" title="Constructor duration()"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">();</span>
 559         <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
 560         <span class="keyword">constexpr</span> <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.duration_c_1" title="Constructor duration(const Rep2&amp;)"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">);</span>
 561
 562         <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 563         <span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.duration_c_2" title="Constructor duration(const duration&amp;)"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 564
 565         <span class="identifier">duration</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
 566
 567         <span class="keyword">constexpr</span> <span class="identifier">rep</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.count" title="Member Function count() const"><code class="computeroutput"><span class="identifier">count</span></code></a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
 568
 569         <span class="keyword">constexpr</span> <span class="identifier">duration</span>  <span class="identifier">__duration__op_plus</span><span class="special">();</span>
 570         <span class="keyword">constexpr</span> <span class="identifier">duration</span>  <span class="identifier">__duration__op_minus</span><span class="special">();</span>
 571         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_pre_inc" title="Member Function operator++()"><code class="computeroutput"><span class="keyword">operator</span><span class="special">++</span></code></a><span class="special">();</span>
 572         <span class="identifier">duration</span>  <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_post_inc" title="Member Function operator++(int)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">++</span></code></a><span class="special">(</span><span class="keyword">int</span><span class="special">);</span>
 573         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_pre_dec" title="Member Function operator--()"><code class="computeroutput"><span class="keyword">operator</span><span class="special">--</span></code></a><span class="special">();</span>
 574         <span class="identifier">duration</span>  <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_post_dec" title="Member Function operator--(int)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">--</span></code></a><span class="special">(</span><span class="keyword">int</span><span class="special">);</span>
 575
 576         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_plus_eq" title="Member Function operator+=(const duration&amp;)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">+=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 577         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_minus_eq" title="Member Function operator-=(const duration&amp;)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">-=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 578
 579         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_mult_eq" title="Member Function operator*=(const rep&amp;)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">*=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 580         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_div_eq" title="Member Function operator/=(const rep&amp;)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">/=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 581         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_mod_eq" title="Member Function operator%=(const duration&amp;)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">%=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 582         <span class="identifier">duration</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_mod_eq2" title="Member Function operator%=(const rep&amp;)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">%=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 583
 584         <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">duration</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.zero" title="Static Member Function zero()"><code class="computeroutput"><span class="identifier">zero</span></code></a><span class="special">();</span>
 585         <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">duration</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.min" title="Static Member Function min()"><code class="computeroutput"><span class="identifier">min</span></code></a><span class="special">();</span>
 586         <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">duration</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.max" title="Static Member Function max()"><code class="computeroutput"><span class="identifier">max</span></code></a><span class="special">();</span>
 587     <span class="special">};</span>
 588
 589 <span class="special">}}</span>
 590 </pre>
 591 <p>
 592             <code class="computeroutput"><span class="identifier">Rep</span></code> must be an arithmetic
 593             type, or a class emulating an arithmetic type, compile diagnostic otherwise.
 594             If <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> is instantiated with
 595             the type of <code class="computeroutput"><span class="identifier">Rep</span></code> being
 596             a <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>, compile diagnostic
 597             is issued.
 598           </p>
 599 <p>
 600             <code class="computeroutput"><span class="identifier">Period</span></code> must be an instantiation
 601             of <code class="computeroutput"><span class="identifier">ratio</span></code>, compile diagnostic
 602             otherwise.
 603           </p>
 604 <p>
 605             <code class="computeroutput"><span class="identifier">Period</span><span class="special">::</span><span class="identifier">num</span></code> must be positive, compile diagnostic
 606             otherwise.
 607           </p>
 608 <p>
 609             Examples:
 610           </p>
 611 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 612 <li class="listitem">
 613                 <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">long</span><span class="special">,</span> <code class="computeroutput"><span class="identifier">ratio</span></code><span class="special">&lt;</span><span class="number">60</span><span class="special">&gt;</span> <span class="special">&gt;</span></code> holds a count of minutes using
 614                 a long.
 615               </li>
 616 <li class="listitem">
 617                 <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">long</span> <span class="keyword">long</span><span class="special">,</span> <span class="identifier">milli</span><span class="special">&gt;</span></code> holds a count of milliseconds
 618                 using a long long.
 619               </li>
 620 <li class="listitem">
 621                 <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span>
 622                 <code class="computeroutput"><span class="identifier">ratio</span></code><span class="special">&lt;</span><span class="number">1</span><span class="special">,</span> <span class="number">30</span><span class="special">&gt;</span> <span class="special">&gt;</span></code> holds a count using a double
 623                 with a tick period of 1/30 second (a tick frequency of 30 Hz).
 624               </li>
 625 </ul></div>
 626 <p>
 627             The following members of <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> do not throw an exception
 628             unless the indicated operations on the representations throw an exception.
 629           </p>
 630 <div class="section">
 631 <div class="titlepage"><div><div><h6 class="title">
 632 <a name="chrono.reference.cpp0x.duration_hpp.duration.duration_c_0"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.duration_c_0" title="Constructor duration()">Constructor
 633             <code class="computeroutput"><span class="identifier">duration</span><span class="special">()</span></code></a>
 634 </h6></div></div></div>
 635 <pre class="programlisting"><span class="keyword">constexpr</span> <span class="identifier">duration</span><span class="special">();</span>
 636 </pre>
 637 <p>
 638               <span class="bold"><strong>Effects:</strong></span> Constructs an object of type
 639               <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> initialized from
 640               <code class="computeroutput"><span class="identifier">duration_values</span><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;::</span><span class="identifier">zero</span><span class="special">()</span></code>
 641               in C++98 or <code class="computeroutput"><span class="identifier">BOOST_CHRONO_DURATION_DEFAULTS_TO_ZERO</span></code>
 642               is defined, otherwise the duration is uninitialized.
 643             </p>
 644 </div>
 645 <div class="section">
 646 <div class="titlepage"><div><div><h6 class="title">
 647 <a name="chrono.reference.cpp0x.duration_hpp.duration.duration_c_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.duration_c_1" title="Constructor duration(const Rep2&amp;)">Constructor
 648             <code class="computeroutput"><span class="identifier">duration</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;)</span></code></a>
 649 </h6></div></div></div>
 650 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
 651 <span class="keyword">constexpr</span> <span class="keyword">explicit</span> <span class="identifier">duration</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">);</span>
 652 </pre>
 653 <p>
 654               <span class="bold"><strong>Remarks:</strong></span> <code class="computeroutput"><span class="identifier">Rep2</span></code>
 655               is implicitly convertible to <code class="computeroutput"><span class="identifier">rep</span></code>,
 656               and
 657             </p>
 658 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 659 <li class="listitem">
 660                   <code class="computeroutput"><span class="identifier">treat_as_floating_point</span><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;::</span><span class="identifier">value</span></code>
 661                   is <code class="computeroutput"><span class="keyword">true</span></code>, or
 662                 </li>
 663 <li class="listitem">
 664                   <code class="computeroutput"><span class="special">!</span><span class="identifier">treat_as_floating_point</span><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;::</span><span class="identifier">value</span>
 665                   <span class="special">&amp;&amp;</span> <span class="special">!</span><span class="identifier">treat_as_floating_point</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">value</span></code> is <code class="computeroutput"><span class="keyword">true</span></code>.
 666                 </li>
 667 </ul></div>
 668 <p>
 669               If these constraints are not met, this constructor will not participate
 670               in overload resolution. <span class="bold"><strong>Note:</strong></span> This
 671               requirement prevents construction of an integral-based <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> with a floating-point
 672               representation. Such a construction could easily lead to confusion
 673               about the value of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
 674             </p>
 675 <p>
 676               <span class="bold"><strong>Example:</strong></span>
 677             </p>
 678 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">milli</span><span class="special">&gt;</span> <span class="identifier">d</span><span class="special">(</span><span class="number">3.5</span><span class="special">);</span>  <span class="comment">// do not compile</span>
 679 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">milli</span><span class="special">&gt;</span> <span class="identifier">d</span><span class="special">(</span><span class="number">3</span><span class="special">);</span>    <span class="comment">// ok</span>
 680 </pre>
 681 <p>
 682               <span class="bold"><strong>Effects:</strong></span> Constructs an object of type
 683               <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
 684             </p>
 685 <p>
 686               <span class="bold"><strong>Post Conditions:</strong></span> <code class="computeroutput"><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;(</span><span class="identifier">r</span><span class="special">)</span></code>.
 687             </p>
 688 </div>
 689 <div class="section">
 690 <div class="titlepage"><div><div><h6 class="title">
 691 <a name="chrono.reference.cpp0x.duration_hpp.duration.duration_c_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.duration_c_2" title="Constructor duration(const duration&amp;)">Constructor
 692             <code class="computeroutput"><span class="identifier">duration</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;)</span></code></a>
 693 </h6></div></div></div>
 694 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 695 <span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 696 </pre>
 697 <p>
 698               <span class="bold"><strong>Remarks:</strong></span> <code class="computeroutput"><span class="identifier">treat_as_floating_point</span><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;::</span><span class="identifier">value</span></code>,
 699               or <code class="computeroutput"><span class="identifier">ratio_divide</span><span class="special">&lt;</span><span class="identifier">Period2</span><span class="special">,</span>
 700               <span class="identifier">period</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">::</span><span class="identifier">den</span> <span class="special">==</span>
 701               <span class="number">1</span></code>, else this constructor will
 702               not participate in overload resolution. <span class="bold"><strong>note</strong></span>
 703               This requirement prevents implicit truncation error when converting
 704               between integral-based <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>s. Such a construction
 705               could easily lead to confusion about the value of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
 706             </p>
 707 <p>
 708               <span class="bold"><strong>Example:</strong></span>
 709             </p>
 710 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">milli</span><span class="special">&gt;</span> <span class="identifier">ms</span><span class="special">(</span><span class="number">3</span><span class="special">);</span>
 711 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">micro</span><span class="special">&gt;</span> <span class="identifier">us</span> <span class="special">=</span> <span class="identifier">ms</span><span class="special">;</span>  <span class="comment">// ok</span>
 712 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">milli</span><span class="special">&gt;</span> <span class="identifier">ms2</span> <span class="special">=</span> <span class="identifier">us</span><span class="special">;</span> <span class="comment">// do not compile</span>
 713 </pre>
 714 <p>
 715               <span class="bold"><strong>Effects:</strong></span> Constructs an object of type
 716               <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>, constructing <code class="computeroutput"><span class="identifier">rep_</span></code> from <code class="computeroutput"><span class="identifier">duration_cast</span><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&gt;(</span><span class="identifier">d</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span></code>.
 717             </p>
 718 </div>
 719 <div class="section">
 720 <div class="titlepage"><div><div><h6 class="title">
 721 <a name="chrono.reference.cpp0x.duration_hpp.duration.count"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.count" title="Member Function count() const">Member
 722             Function <code class="computeroutput"><span class="identifier">count</span><span class="special">()</span>
 723             <span class="keyword">const</span></code></a>
 724 </h6></div></div></div>
 725 <pre class="programlisting"><span class="keyword">constexpr</span> <span class="identifier">rep</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
 726 </pre>
 727 <p>
 728               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">rep_</span></code>.
 729             </p>
 730 </div>
 731 <div class="section">
 732 <div class="titlepage"><div><div><h6 class="title">
 733 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_unary_plus"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_unary_plus" title="Member Function operator+() const">Member
 734             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+()</span>
 735             <span class="keyword">const</span></code></a>
 736 </h6></div></div></div>
 737 <pre class="programlisting"><span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> <span class="keyword">operator</span><span class="special">+()</span> <span class="keyword">const</span><span class="special">;</span>
 738 </pre>
 739 <p>
 740               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 741             </p>
 742 </div>
 743 <div class="section">
 744 <div class="titlepage"><div><div><h6 class="title">
 745 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_unary_minus"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_unary_minus" title="Member Function operator-() const">Member
 746             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-()</span>
 747             <span class="keyword">const</span></code></a>
 748 </h6></div></div></div>
 749 <pre class="programlisting"><span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> <span class="keyword">operator</span><span class="special">-()</span> <span class="keyword">const</span><span class="special">;</span>
 750 </pre>
 751 <p>
 752               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(-</span><span class="identifier">rep_</span><span class="special">)</span></code>.
 753             </p>
 754 </div>
 755 <div class="section">
 756 <div class="titlepage"><div><div><h6 class="title">
 757 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_pre_inc"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_pre_inc" title="Member Function operator++()">Member
 758             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">++()</span></code></a>
 759 </h6></div></div></div>
 760 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">++();</span>
 761 </pre>
 762 <p>
 763               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="special">++</span><span class="identifier">rep_</span></code>.
 764             </p>
 765 <p>
 766               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 767             </p>
 768 </div>
 769 <div class="section">
 770 <div class="titlepage"><div><div><h6 class="title">
 771 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_post_inc"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_post_inc" title="Member Function operator++(int)">Member
 772             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">++(</span><span class="keyword">int</span><span class="special">)</span></code></a>
 773 </h6></div></div></div>
 774 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> <span class="keyword">operator</span><span class="special">++(</span><span class="keyword">int</span><span class="special">);</span>
 775 </pre>
 776 <p>
 777               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><span class="identifier">rep_</span><span class="special">++)</span></code>.
 778             </p>
 779 </div>
 780 <div class="section">
 781 <div class="titlepage"><div><div><h6 class="title">
 782 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_pre_dec"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_pre_dec" title="Member Function operator--()">Member
 783             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">--()</span></code></a>
 784 </h6></div></div></div>
 785 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">--();</span>
 786 </pre>
 787 <p>
 788               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="special">--</span><span class="identifier">rep_</span></code>.
 789             </p>
 790 <p>
 791               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 792             </p>
 793 </div>
 794 <div class="section">
 795 <div class="titlepage"><div><div><h6 class="title">
 796 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_post_dec"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_post_dec" title="Member Function operator--(int)">Member
 797             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">--(</span><span class="keyword">int</span><span class="special">)</span></code></a>
 798 </h6></div></div></div>
 799 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> <span class="keyword">operator</span><span class="special">--(</span><span class="keyword">int</span><span class="special">);</span>
 800 </pre>
 801 <p>
 802               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><span class="identifier">rep_</span><span class="special">--)</span></code>.
 803             </p>
 804 </div>
 805 <div class="section">
 806 <div class="titlepage"><div><div><h6 class="title">
 807 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_plus_eq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_plus_eq" title="Member Function operator+=(const duration&amp;)">Member
 808             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+=(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;)</span></code></a>
 809 </h6></div></div></div>
 810 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">+=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 811 </pre>
 812 <p>
 813               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rep_</span>
 814               <span class="special">+=</span> <span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span></code>.
 815             </p>
 816 <p>
 817               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 818             </p>
 819 </div>
 820 <div class="section">
 821 <div class="titlepage"><div><div><h6 class="title">
 822 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_minus_eq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_minus_eq" title="Member Function operator-=(const duration&amp;)">Member
 823             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-=(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;)</span></code></a>
 824 </h6></div></div></div>
 825 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">-=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 826 </pre>
 827 <p>
 828               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rep_</span>
 829               <span class="special">-=</span> <span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span></code>.
 830             </p>
 831 <p>
 832               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 833             </p>
 834 </div>
 835 <div class="section">
 836 <div class="titlepage"><div><div><h6 class="title">
 837 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_mod_eq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_mod_eq" title="Member Function operator%=(const duration&amp;)">Member
 838             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">%=(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;)</span></code></a>
 839 </h6></div></div></div>
 840 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">%=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 841 </pre>
 842 <p>
 843               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rep_</span>
 844               <span class="special">%=</span> <span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span></code>.
 845             </p>
 846 <p>
 847               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 848             </p>
 849 </div>
 850 <div class="section">
 851 <div class="titlepage"><div><div><h6 class="title">
 852 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_mult_eq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_mult_eq" title="Member Function operator*=(const rep&amp;)">Member
 853             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">*=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;)</span></code></a>
 854 </h6></div></div></div>
 855 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">*=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 856 </pre>
 857 <p>
 858               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rep_</span>
 859               <span class="special">*=</span> <span class="identifier">rhs</span></code>.
 860             </p>
 861 <p>
 862               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 863             </p>
 864 </div>
 865 <div class="section">
 866 <div class="titlepage"><div><div><h6 class="title">
 867 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_div_eq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_div_eq" title="Member Function operator/=(const rep&amp;)">Member
 868             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">/=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;)</span></code></a>
 869 </h6></div></div></div>
 870 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">/=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 871 </pre>
 872 <p>
 873               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rep_</span>
 874               <span class="special">/=</span> <span class="identifier">rhs</span></code>.
 875             </p>
 876 <p>
 877               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 878             </p>
 879 </div>
 880 <div class="section">
 881 <div class="titlepage"><div><div><h6 class="title">
 882 <a name="chrono.reference.cpp0x.duration_hpp.duration.op_mod_eq2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.op_mod_eq2" title="Member Function operator%=(const rep&amp;)">Member
 883             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">%=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;)</span></code></a>
 884 </h6></div></div></div>
 885 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">%=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 886 </pre>
 887 <p>
 888               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rep_</span>
 889               <span class="special">%=</span> <span class="identifier">rhs</span></code>.
 890             </p>
 891 <p>
 892               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 893             </p>
 894 </div>
 895 <div class="section">
 896 <div class="titlepage"><div><div><h6 class="title">
 897 <a name="chrono.reference.cpp0x.duration_hpp.duration.zero"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.zero" title="Static Member Function zero()">Static
 898             Member Function <code class="computeroutput"><span class="identifier">zero</span><span class="special">()</span></code></a>
 899 </h6></div></div></div>
 900 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> <span class="identifier">zero</span><span class="special">();</span>
 901 </pre>
 902 <p>
 903               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code></a><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;::</span><span class="identifier">zero</span><span class="special">())</span></code>.
 904             </p>
 905 </div>
 906 <div class="section">
 907 <div class="titlepage"><div><div><h6 class="title">
 908 <a name="chrono.reference.cpp0x.duration_hpp.duration.min"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.min" title="Static Member Function min()">Static
 909             Member Function <code class="computeroutput"><span class="identifier">min</span><span class="special">()</span></code></a>
 910 </h6></div></div></div>
 911 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> <span class="identifier">min</span><span class="special">();</span>
 912 </pre>
 913 <p>
 914               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code></a><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;::</span><span class="identifier">min</span><span class="special">()).</span></code>
 915             </p>
 916 </div>
 917 <div class="section">
 918 <div class="titlepage"><div><div><h6 class="title">
 919 <a name="chrono.reference.cpp0x.duration_hpp.duration.max"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration.max" title="Static Member Function max()">Static
 920             Member Function <code class="computeroutput"><span class="identifier">max</span><span class="special">()</span></code></a>
 921 </h6></div></div></div>
 922 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> <span class="identifier">max</span><span class="special">();</span>
 923 </pre>
 924 <p>
 925               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">(</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code></a><span class="special">&lt;</span><span class="identifier">rep</span><span class="special">&gt;::</span><span class="identifier">max</span><span class="special">())</span></code>.
 926             </p>
 927 </div>
 928 </div>
 929 <div class="section">
 930 <div class="titlepage"><div><div><h5 class="title">
 931 <a name="chrono.reference.cpp0x.duration_hpp.arith"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith" title="duration Non-Member Arithmetic"><code class="computeroutput"><span class="identifier">duration</span></code> Non-Member Arithmetic</a>
 932 </h5></div></div></div>
 933 <div class="section">
 934 <div class="titlepage"><div><div><h6 class="title">
 935 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_plus_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_plus_1" title="Non-Member Function operator+(duration,duration)">Non-Member
 936             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
 937 </h6></div></div></div>
 938 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 939 <span class="keyword">constexpr</span>
 940 <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
 941 <span class="keyword">operator</span><span class="special">+(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 942 </pre>
 943 <p>
 944               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">CD</span><span class="special">(</span><span class="identifier">CD</span><span class="special">(</span><span class="identifier">lhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">CD</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">())</span></code>
 945               where <code class="computeroutput"><span class="identifier">CD</span></code> is the type
 946               of the return value.
 947             </p>
 948 </div>
 949 <div class="section">
 950 <div class="titlepage"><div><div><h6 class="title">
 951 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_minus_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_minus_1" title="Non-Member Function operator-(duration,duration)">Non-Member
 952             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
 953 </h6></div></div></div>
 954 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
 955 <span class="keyword">constexpr</span>
 956 <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
 957 <span class="keyword">operator</span><span class="special">-(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
 958 </pre>
 959 <p>
 960               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">CD</span><span class="special">(</span><span class="identifier">CD</span><span class="special">(</span><span class="identifier">lhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span> <span class="special">-</span> <span class="identifier">CD</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">())</span></code>
 961               where <code class="computeroutput"><span class="identifier">CD</span></code> is the type
 962               of the return value.
 963             </p>
 964 </div>
 965 <div class="section">
 966 <div class="titlepage"><div><div><h6 class="title">
 967 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_mult_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_mult_1" title="Non-Member Function operator*(duration,Rep1)">Non-Member
 968             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">*(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">Rep1</span><span class="special">)</span></code></a>
 969 </h6></div></div></div>
 970 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
 971 <span class="keyword">constexpr</span>
 972 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 973 <span class="keyword">operator</span><span class="special">*(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">);</span>
 974 </pre>
 975 <p>
 976               <span class="bold"><strong>Requires:</strong></span> Let <code class="computeroutput"><span class="identifier">CR</span></code>
 977               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
 978               of <code class="computeroutput"><span class="identifier">Rep1</span></code> and <code class="computeroutput"><span class="identifier">Rep2</span></code>. This function will not participate
 979               in overload resolution unless both <code class="computeroutput"><span class="identifier">Rep1</span></code>
 980               and <code class="computeroutput"><span class="identifier">Rep2</span></code> are implicitly
 981               convertible to <code class="computeroutput"><span class="identifier">CR</span></code>.
 982             </p>
 983 <p>
 984               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">CD</span><span class="special">(</span><span class="identifier">CD</span><span class="special">(</span><span class="identifier">d</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span> <span class="special">*</span> <span class="identifier">s</span><span class="special">)</span></code>
 985               where <code class="computeroutput"><span class="identifier">CD</span></code> is the type
 986               of the return value.
 987             </p>
 988 </div>
 989 <div class="section">
 990 <div class="titlepage"><div><div><h6 class="title">
 991 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_mult_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_mult_2" title="Non-Member Function operator*(Rep1,duration)">Non-Member
 992             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">*(</span><span class="identifier">Rep1</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
 993 </h6></div></div></div>
 994 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
 995 <span class="keyword">constexpr</span>
 996 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
 997 <span class="keyword">operator</span><span class="special">*(</span><span class="keyword">const</span> <span class="identifier">Rep1</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
 998 </pre>
 999 <p>
1000               <span class="bold"><strong>Requires:</strong></span> Let <code class="computeroutput"><span class="identifier">CR</span></code>
1001               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
1002               of <code class="computeroutput"><span class="identifier">Rep1</span></code> and <code class="computeroutput"><span class="identifier">Rep2</span></code>. This function will not participate
1003               in overload resolution unless both <code class="computeroutput"><span class="identifier">Rep1</span></code>
1004               and <code class="computeroutput"><span class="identifier">Rep2</span></code> are implicitly
1005               convertible to <code class="computeroutput"><span class="identifier">CR</span></code>.
1006             </p>
1007 <p>
1008               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">d</span>
1009               <span class="special">*</span> <span class="identifier">s</span></code>.
1010             </p>
1011 </div>
1012 <div class="section">
1013 <div class="titlepage"><div><div><h6 class="title">
1014 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_1" title="Non-Member Function operator/(duration,Rep2)">Non-Member
1015             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">/(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">Rep2</span><span class="special">)</span></code></a>
1016 </h6></div></div></div>
1017 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
1018 <span class="keyword">constexpr</span>
1019 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
1020 <span class="keyword">operator</span><span class="special">/(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">);</span>
1021 </pre>
1022 <p>
1023               <span class="bold"><strong>Requires:</strong></span> Let <code class="computeroutput"><span class="identifier">CR</span></code>
1024               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
1025               of <code class="computeroutput"><span class="identifier">Rep1</span></code> and <code class="computeroutput"><span class="identifier">Rep2</span></code>. This function will not participate
1026               in overload resolution unless both <code class="computeroutput"><span class="identifier">Rep1</span></code>
1027               and <code class="computeroutput"><span class="identifier">Rep2</span></code> are implicitly
1028               convertible to <code class="computeroutput"><span class="identifier">CR</span></code>,
1029               and <code class="computeroutput"><span class="identifier">Rep2</span></code> is not an
1030               instantiation of <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
1031             </p>
1032 <p>
1033               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">CD</span><span class="special">(</span><span class="identifier">CD</span><span class="special">(</span><span class="identifier">d</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span> <span class="special">/</span> <span class="identifier">s</span><span class="special">)</span></code>
1034               where <code class="computeroutput"><span class="identifier">CD</span></code> is the type
1035               of the return value.
1036             </p>
1037 </div>
1038 <div class="section">
1039 <div class="titlepage"><div><div><h6 class="title">
1040 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_2" title="Non-Member Function operator/(duration,duration)">Non-Member
1041             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">/(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1042 </h6></div></div></div>
1043 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1044 <span class="keyword">constexpr</span>
1045 <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span>
1046 <span class="keyword">operator</span><span class="special">/(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1047 </pre>
1048 <p>
1049               <span class="bold"><strong>Remarks:</strong></span> Let <code class="computeroutput"><span class="identifier">CD</span></code>
1050               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
1051               of the two <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> arguments. <span class="bold"><strong>Returns:</strong></span> Returns <code class="computeroutput"><span class="identifier">CD</span><span class="special">(</span><span class="identifier">lhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span> <span class="special">/</span> <span class="identifier">CD</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span></code>.
1052             </p>
1053 </div>
1054 <div class="section">
1055 <div class="titlepage"><div><div><h6 class="title">
1056 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_3"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_div_3" title="Non-Member Function operator/(Rep1,duration)">Non-Member
1057             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">/(</span><span class="identifier">Rep1</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1058 </h6></div></div></div>
1059 <p>
1060               Included only if BOOST_CHRONO_EXTENSIONS is defined.
1061             </p>
1062 <p>
1063               This overloading could be used to get the frequency of an event counted
1064               by <code class="computeroutput"><span class="identifier">Rep1</span></code>.
1065             </p>
1066 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
1067 <span class="keyword">constexpr</span>
1068 <span class="keyword">double</span> <span class="keyword">operator</span><span class="special">/(</span><span class="keyword">const</span> <span class="identifier">Rep1</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1069 </pre>
1070 <p>
1071               <span class="bold"><strong>Remarks:</strong></span> Let <code class="computeroutput"><span class="identifier">CR</span></code>
1072               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
1073               of <code class="computeroutput"><span class="identifier">Rep1</span></code> and <code class="computeroutput"><span class="identifier">Rep2</span></code>. This function will not participate
1074               in overload resolution unless both <code class="computeroutput"><span class="identifier">Rep1</span></code>
1075               and <code class="computeroutput"><span class="identifier">Rep2</span></code> are implicitly
1076               convertible to <code class="computeroutput"><span class="identifier">CR</span></code>,
1077               and <code class="computeroutput"><span class="identifier">Rep1</span></code> is not an
1078               instantiation of <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>. Let <code class="computeroutput"><span class="identifier">CD</span></code> represent <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>&lt;CR,Period&gt;.
1079             </p>
1080 <p>
1081               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">CR</span><span class="special">(</span><span class="identifier">s</span><span class="special">)/</span><span class="identifier">CD</span><span class="special">(</span><span class="identifier">d</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span></code> where <code class="computeroutput"><span class="identifier">CD</span></code>
1082               is the type of the return value.
1083             </p>
1084 </div>
1085 <div class="section">
1086 <div class="titlepage"><div><div><h6 class="title">
1087 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_mod_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_mod_1" title="Non-Member Function operator%(duration,Rep2)">Non-Member
1088             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">%(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">Rep2</span><span class="special">)</span></code></a>
1089 </h6></div></div></div>
1090 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
1091 <span class="keyword">constexpr</span>
1092 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Rep2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
1093 <span class="keyword">operator</span><span class="special">%(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Rep2</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">);</span>
1094 </pre>
1095 <p>
1096               <span class="bold"><strong>Remarks:</strong></span> Let <code class="computeroutput"><span class="identifier">CR</span></code>
1097               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
1098               of <code class="computeroutput"><span class="identifier">Rep1</span></code> and <code class="computeroutput"><span class="identifier">Rep2</span></code>. This function will not participate
1099               in overload resolution unless Rep2 must be implicitly convertible to
1100               CR and Rep2 must not be an instantiation of <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
1101             </p>
1102 <p>
1103               <span class="bold"><strong>Returns:</strong></span> CD(CD(d).count() % s) where
1104               <code class="computeroutput"><span class="identifier">CD</span></code> is the type of the
1105               return value.
1106             </p>
1107 </div>
1108 <div class="section">
1109 <div class="titlepage"><div><div><h6 class="title">
1110 <a name="chrono.reference.cpp0x.duration_hpp.arith.duration__op_mod_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.arith.duration__op_mod_2" title="Non-Member Function operator%(duration,duration)">Non-Member
1111             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">%(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1112 </h6></div></div></div>
1113 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1114 <span class="keyword">constexpr</span>
1115 <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span>
1116 <span class="keyword">operator</span><span class="special">%(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1117           <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1118 </pre>
1119 <p>
1120               <span class="bold"><strong>Remarks:</strong></span> This function will not participate
1121               in overload resolution unless
1122             </p>
1123 <p>
1124               <span class="bold"><strong>Returns:</strong></span> CD(CD(lhs).count() % CD(rhs).count())
1125               where <code class="computeroutput"><span class="identifier">CD</span></code> is the type
1126               of the return value.
1127             </p>
1128 </div>
1129 </div>
1130 <div class="section">
1131 <div class="titlepage"><div><div><h5 class="title">
1132 <a name="chrono.reference.cpp0x.duration_hpp.cmp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp" title="duration Non-Member Comparaisons"><code class="computeroutput"><span class="identifier">duration</span></code> Non-Member Comparaisons</a>
1133 </h5></div></div></div>
1134 <div class="section">
1135 <div class="titlepage"><div><div><h6 class="title">
1136 <a name="chrono.reference.cpp0x.duration_hpp.cmp.duration__op_eq_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_eq_1" title="Non-Member Function operator==(duration,duration)">Non-Member
1137             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">==(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1138 </h6></div></div></div>
1139 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1140 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1141                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1142 </pre>
1143 <p>
1144               <span class="bold"><strong>Returns:</strong></span> Let <code class="computeroutput"><span class="identifier">CD</span></code>
1145               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
1146               of the two <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> arguments.
1147             </p>
1148 <p>
1149               <span class="bold"><strong>Returns:</strong></span> Returns <code class="computeroutput"><span class="identifier">CD</span><span class="special">(</span><span class="identifier">lhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">CD</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span></code>
1150             </p>
1151 </div>
1152 <div class="section">
1153 <div class="titlepage"><div><div><h6 class="title">
1154 <a name="chrono.reference.cpp0x.duration_hpp.cmp.duration__op_neq_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_neq_1" title="Non-Member Function operator!=(duration,duration)">Non-Member
1155             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">!=(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1156 </h6></div></div></div>
1157 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1158 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1159                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1160 </pre>
1161 <p>
1162               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special">==</span>
1163               <span class="identifier">rhs</span><span class="special">)</span></code>.
1164             </p>
1165 </div>
1166 <div class="section">
1167 <div class="titlepage"><div><div><h6 class="title">
1168 <a name="chrono.reference.cpp0x.duration_hpp.cmp.duration__op_lt_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_lt_1" title="Non-Member Function operator&lt;(duration,duration)">Non-Member
1169             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1170 </h6></div></div></div>
1171 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1172 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;</span> <span class="special">(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1173                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1174 </pre>
1175 <p>
1176               <span class="bold"><strong>Returns:</strong></span> Let <code class="computeroutput"><span class="identifier">CD</span></code>
1177               represent the <code class="computeroutput"><span class="identifier">common_type</span></code>
1178               of the two <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> arguments. Returns
1179               <code class="computeroutput"><span class="identifier">CD</span><span class="special">(</span><span class="identifier">lhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span>
1180               <span class="special">&lt;</span> <span class="identifier">CD</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">).</span><span class="identifier">count</span><span class="special">()</span></code>
1181             </p>
1182 </div>
1183 <div class="section">
1184 <div class="titlepage"><div><div><h6 class="title">
1185 <a name="chrono.reference.cpp0x.duration_hpp.cmp.duration__op_leq_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_leq_1" title="Non-Member Function operator&lt;=(duration,duration)">Non-Member
1186             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;=(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1187 </h6></div></div></div>
1188 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1189 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1190                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1191 </pre>
1192 <p>
1193               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">!(</span><span class="identifier">rhs</span> <span class="special">&lt;</span>
1194               <span class="identifier">lhs</span><span class="special">)</span></code>.
1195             </p>
1196 </div>
1197 <div class="section">
1198 <div class="titlepage"><div><div><h6 class="title">
1199 <a name="chrono.reference.cpp0x.duration_hpp.cmp.duration__op_gt_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_gt_1" title="Non-Member Function operator&gt;(duration,duration)">Non-Member
1200             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1201 </h6></div></div></div>
1202 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1203 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;</span> <span class="special">(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1204                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1205 </pre>
1206 <p>
1207               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">rhs</span>
1208               <span class="special">&lt;</span> <span class="identifier">lhs</span></code>.
1209             </p>
1210 </div>
1211 <div class="section">
1212 <div class="titlepage"><div><div><h6 class="title">
1213 <a name="chrono.reference.cpp0x.duration_hpp.cmp.duration__op_geq_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.cmp.duration__op_geq_1" title="Non-Member Function operator&gt;=(duration,duration)">Non-Member
1214             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;=(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1215 </h6></div></div></div>
1216 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1217 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1218                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1219 </pre>
1220 <p>
1221               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special">&lt;</span>
1222               <span class="identifier">rhs</span><span class="special">)</span></code>.
1223             </p>
1224 </div>
1225 </div>
1226 <div class="section">
1227 <div class="titlepage"><div><div><h5 class="title">
1228 <a name="chrono.reference.cpp0x.duration_hpp.duration_cast"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_cast" title="Non-Member Function duration_cast(duration)">Non-Member
1229           Function <code class="computeroutput"><span class="identifier">duration_cast</span><span class="special">(</span><span class="identifier">duration</span><span class="special">)</span></code></a>
1230 </h5></div></div></div>
1231 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">ToDuration</span></code></a><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
1232 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">ToDuration</span></code></a> <span class="identifier">duration_cast</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1233 </pre>
1234 <p>
1235             <span class="bold"><strong>Requires:</strong></span> This function will not participate
1236             in overload resolution unless <code class="computeroutput"><span class="identifier">ToDuration</span></code>
1237             is an instantiation of <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
1238           </p>
1239 <p>
1240             <span class="bold"><strong>Returns:</strong></span> Forms <code class="computeroutput"><span class="identifier">CF</span></code>
1241             which is a <code class="computeroutput"><span class="identifier">ratio</span></code> resulting
1242             from <code class="computeroutput"><span class="identifier">ratio_divide</span><span class="special">&lt;</span><span class="identifier">Period</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">ToDuration</span><span class="special">::</span><span class="identifier">period</span><span class="special">&gt;::</span><span class="identifier">type</span></code>.
1243             Let <code class="computeroutput"><span class="identifier">CR</span></code> be the <code class="computeroutput"><span class="identifier">common_type</span></code> of <code class="computeroutput"><span class="identifier">ToDuration</span><span class="special">::</span><span class="identifier">rep</span></code>,
1244             <code class="computeroutput"><span class="identifier">Rep</span></code>, and <code class="computeroutput"><span class="identifier">intmax_t</span></code>.
1245           </p>
1246 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
1247 <li class="listitem">
1248                 If <code class="computeroutput"><span class="identifier">CF</span><span class="special">::</span><span class="identifier">num</span> <span class="special">==</span>
1249                 <span class="number">1</span></code> and <code class="computeroutput"><span class="identifier">CF</span><span class="special">::</span><span class="identifier">den</span>
1250                 <span class="special">==</span> <span class="number">1</span></code>,
1251                 then returns <code class="computeroutput"><span class="identifier">ToDuration</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">typename</span>
1252                 <span class="identifier">ToDuration</span><span class="special">::</span><span class="identifier">rep</span><span class="special">&gt;(</span><span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">()))</span>
1253                 </code>
1254               </li>
1255 <li class="listitem">
1256                 else if <code class="computeroutput"><span class="identifier">CF</span><span class="special">::</span><span class="identifier">num</span> <span class="special">!=</span>
1257                 <span class="number">1</span></code> and <code class="computeroutput"><span class="identifier">CF</span><span class="special">::</span><span class="identifier">den</span>
1258                 <span class="special">==</span> <span class="number">1</span></code>,
1259                 then returns <code class="computeroutput"><span class="identifier">ToDuration</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">typename</span>
1260                 <span class="identifier">ToDuration</span><span class="special">::</span><span class="identifier">rep</span><span class="special">&gt;(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">CR</span><span class="special">&gt;(</span><span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">())</span>
1261                 <span class="special">*</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">CR</span><span class="special">&gt;(</span><span class="identifier">CF</span><span class="special">::</span><span class="identifier">num</span><span class="special">)))</span></code>
1262               </li>
1263 <li class="listitem">
1264                 else if <code class="computeroutput"><span class="identifier">CF</span><span class="special">::</span><span class="identifier">num</span> <span class="special">==</span>
1265                 <span class="number">1</span></code> and <code class="computeroutput"><span class="identifier">CF</span><span class="special">::</span><span class="identifier">den</span>
1266                 <span class="special">!=</span> <span class="number">1</span></code>,
1267                 then returns <code class="computeroutput"><span class="identifier">ToDuration</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">typename</span>
1268                 <span class="identifier">ToDuration</span><span class="special">::</span><span class="identifier">rep</span><span class="special">&gt;(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">CR</span><span class="special">&gt;(</span><span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">())</span>
1269                 <span class="special">/</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">CR</span><span class="special">&gt;(</span><span class="identifier">CF</span><span class="special">::</span><span class="identifier">den</span><span class="special">)))</span></code>
1270               </li>
1271 <li class="listitem">
1272                 else returns <code class="computeroutput"><span class="identifier">ToDuration</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">typename</span>
1273                 <span class="identifier">ToDuration</span><span class="special">::</span><span class="identifier">rep</span><span class="special">&gt;(</span><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">CR</span><span class="special">&gt;(</span><span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">())</span>
1274                 <span class="special">*</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">CR</span><span class="special">&gt;(</span><span class="identifier">CF</span><span class="special">::</span><span class="identifier">num</span><span class="special">)</span> <span class="special">/</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">CR</span><span class="special">&gt;(</span><span class="identifier">CF</span><span class="special">::</span><span class="identifier">den</span><span class="special">)))</span></code>
1275               </li>
1276 </ul></div>
1277 <p>
1278             <span class="bold"><strong>Remarks:</strong></span> This function does not rely
1279             on any implicit conversions. All conversions must be accomplished through
1280             <code class="computeroutput"><span class="keyword">static_cast</span></code>. The implementation
1281             avoids all multiplications or divisions when it is known at compile-time
1282             that it can be avoided because one or more arguments are <code class="computeroutput"><span class="number">1</span></code>. All intermediate computations are carried
1283             out in the widest possible representation and only converted to the destination
1284             representation at the final step.
1285           </p>
1286 </div>
1287 <div class="section">
1288 <div class="titlepage"><div><div><h5 class="title">
1289 <a name="chrono.reference.cpp0x.duration_hpp.duration_typedefs"></a><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">duration</span></code> typedefs</a>
1290 </h5></div></div></div>
1291 <pre class="programlisting"><span class="comment">// convenience typedefs</span>
1292 <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">,</span> <span class="identifier">nano</span><span class="special">&gt;</span> <span class="identifier">nanoseconds</span><span class="special">;</span>    <span class="comment">// at least 64 bits needed</span>
1293 <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">,</span> <span class="identifier">micro</span><span class="special">&gt;</span> <span class="identifier">microseconds</span><span class="special">;</span>  <span class="comment">// at least 55 bits needed</span>
1294 <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">,</span> <span class="identifier">milli</span><span class="special">&gt;</span> <span class="identifier">milliseconds</span><span class="special">;</span>  <span class="comment">// at least 45 bits needed</span>
1295 <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least64_t</span><span class="special">&gt;</span> <span class="identifier">seconds</span><span class="special">;</span>              <span class="comment">// at least 35 bits needed</span>
1296 <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least32_t</span><span class="special">,</span> <code class="computeroutput"><span class="identifier">ratio</span></code><span class="special">&lt;</span> <span class="number">60</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">minutes</span><span class="special">;</span> <span class="comment">// at least 29 bits needed</span>
1297 <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">int_least32_t</span><span class="special">,</span> <code class="computeroutput"><span class="identifier">ratio</span></code><span class="special">&lt;</span><span class="number">3600</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">hours</span><span class="special">;</span>  <span class="comment">// at least 23 bits needed</span>
1298 </pre>
1299 </div>
1300 </div>
1301 <div class="section">
1302 <div class="titlepage"><div><div><h4 class="title">
1303 <a name="chrono.reference.cpp0x.clock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code>
1304         Requirements</a>
1305 </h4></div></div></div>
1306 <p>
1307           A clock represents a bundle consisting of a <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>, a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>, and a function <code class="computeroutput"><span class="identifier">now</span><span class="special">()</span></code>
1308           to get the current <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>. A clock must meet
1309           the requirements in the following Table.
1310         </p>
1311 <p>
1312           In this table <code class="computeroutput"><span class="identifier">C1</span></code> and <code class="computeroutput"><span class="identifier">C2</span></code> denote <code class="computeroutput"><span class="identifier">Clock</span></code>
1313           types. <code class="computeroutput"><span class="identifier">t1</span></code> and <code class="computeroutput"><span class="identifier">t2</span></code> are values returned from <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>
1314           where the call returning <code class="computeroutput"><span class="identifier">t1</span></code>
1315           happens before the call returning <code class="computeroutput"><span class="identifier">t2</span></code>
1316           and both of these calls occur before <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">::</span><span class="identifier">max</span><span class="special">()</span></code>. (note This means C1 did not wrap around
1317           between t1 and t2.).
1318         </p>
1319 <div class="table">
1320 <a name="chrono.reference.cpp0x.clock.clock_requirements"></a><p class="title"><b>Table&#160;8.1.&#160;Clock Requirements</b></p>
1321 <div class="table-contents"><table class="table" summary="Clock Requirements">
1322 <colgroup>
1323 <col>
1324 <col>
1325 <col>
1326 </colgroup>
1327 <thead><tr>
1328 <th>
1329                   <p>
1330                     expression
1331                   </p>
1332                 </th>
1333 <th>
1334                   <p>
1335                     return type
1336                   </p>
1337                 </th>
1338 <th>
1339                   <p>
1340                     operational semantics
1341                   </p>
1342                 </th>
1343 </tr></thead>
1344 <tbody>
1345 <tr>
1346 <td>
1347                   <p>
1348                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">rep</span></code>
1349                   </p>
1350                 </td>
1351 <td>
1352                   <p>
1353                     An arithmetic type or class emulating an arithmetic type.
1354                   </p>
1355                 </td>
1356 <td>
1357                   <p>
1358                     The representation type of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> and <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>.
1359                   </p>
1360                 </td>
1361 </tr>
1362 <tr>
1363 <td>
1364                   <p>
1365                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">period</span></code>
1366                   </p>
1367                 </td>
1368 <td>
1369                   <p>
1370                     <code class="computeroutput"><span class="identifier">ratio</span></code>
1371                   </p>
1372                 </td>
1373 <td>
1374                   <p>
1375                     The tick period of the clock in seconds.
1376                   </p>
1377                 </td>
1378 </tr>
1379 <tr>
1380 <td>
1381                   <p>
1382                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">duration</span></code>
1383                   </p>
1384                 </td>
1385 <td>
1386                   <p>
1387                     <code class="computeroutput"><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">C1</span><span class="special">::</span><span class="identifier">rep</span><span class="special">,</span>
1388                     <span class="identifier">C1</span><span class="special">::</span><span class="identifier">period</span><span class="special">&gt;</span></code>
1389                   </p>
1390                 </td>
1391 <td>
1392                   <p>
1393                     The <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> type of the
1394                     <code class="computeroutput"><span class="identifier">clock</span></code>.
1395                   </p>
1396                 </td>
1397 </tr>
1398 <tr>
1399 <td>
1400                   <p>
1401                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">time_point</span></code>
1402                   </p>
1403                 </td>
1404 <td>
1405                   <p>
1406                     <code class="computeroutput"><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">C1</span><span class="special">&gt;</span>
1407                     <span class="keyword">or</span> <span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">C2</span><span class="special">,</span> <span class="identifier">C1</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&gt;</span></code>
1408                   </p>
1409                 </td>
1410 <td>
1411                   <p>
1412                     The <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> type of the
1413                     <code class="computeroutput"><span class="identifier">clock</span></code>. Different
1414                     clocks are permitted to share a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> definition
1415                     if it is valid to compare their time_points by comparing their
1416                     respective <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>s. <code class="computeroutput"><span class="identifier">C1</span></code> and <code class="computeroutput"><span class="identifier">C2</span></code>
1417                     must refer to the same epoch.
1418                   </p>
1419                 </td>
1420 </tr>
1421 <tr>
1422 <td>
1423                   <p>
1424                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">is_steady</span></code>
1425                   </p>
1426                 </td>
1427 <td>
1428                   <p>
1429                     <code class="computeroutput"><span class="keyword">constexpr</span> <span class="keyword">bool</span></code>
1430                   </p>
1431                 </td>
1432 <td>
1433                   <p>
1434                     <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="identifier">t1</span> <span class="special">&lt;=</span>
1435                     <span class="identifier">t2</span></code> is always <code class="computeroutput"><span class="keyword">true</span></code>, else <code class="computeroutput"><span class="keyword">false</span></code>.
1436                     <span class="bold"><strong>Note</strong></span>: A <code class="computeroutput"><span class="identifier">clock</span></code>
1437                     that can be adjusted backwards is not steady
1438                   </p>
1439                 </td>
1440 </tr>
1441 <tr>
1442 <td>
1443                   <p>
1444                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>
1445                   </p>
1446                 </td>
1447 <td>
1448                   <p>
1449                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">time_point</span></code>
1450                   </p>
1451                 </td>
1452 <td>
1453                   <p>
1454                     Returns a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> representing
1455                     the current point in time.
1456                   </p>
1457                 </td>
1458 </tr>
1459 </tbody>
1460 </table></div>
1461 </div>
1462 <br class="table-break"><p>
1463           Models of <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>:
1464         </p>
1465 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
1466 <li class="listitem">
1467               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a>
1468             </li>
1469 <li class="listitem">
1470               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a>
1471             </li>
1472 <li class="listitem">
1473               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock" title="Class high_resolution_clock"><code class="computeroutput"><span class="identifier">high_resolution_clock</span></code></a>
1474             </li>
1475 <li class="listitem">
1476               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>
1477             </li>
1478 <li class="listitem">
1479               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock"><code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a>
1480             </li>
1481 <li class="listitem">
1482               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a>
1483             </li>
1484 <li class="listitem">
1485               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock" title="Class process_cpu_clock"><code class="computeroutput"><span class="identifier">process_cpu_clock</span></code></a>
1486             </li>
1487 <li class="listitem">
1488               <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a>
1489             </li>
1490 </ul></div>
1491 </div>
1492 <div class="section">
1493 <div class="titlepage"><div><div><h4 class="title">
1494 <a name="chrono.reference.cpp0x.trivial_clock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.trivial_clock" title="TrivialClock Requirements"><code class="computeroutput"><span class="identifier">TrivialClock</span></code> Requirements</a>
1495 </h4></div></div></div>
1496 <p>
1497           A type <code class="computeroutput"><span class="identifier">TC</span></code> meets the <code class="computeroutput"><span class="identifier">TrivialClock</span></code> requirements if:
1498         </p>
1499 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
1500 <li class="listitem">
1501               <code class="computeroutput"><span class="identifier">TC</span></code> satisfies the <code class="computeroutput"><span class="identifier">Clock</span></code> requirements,
1502             </li>
1503 <li class="listitem">
1504               the types <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">rep</span></code>, <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">duration</span></code>,
1505               and <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">time_point</span></code> satisfy the requirements
1506               of <code class="computeroutput"><span class="identifier">EqualityComparable</span></code>,
1507               <code class="computeroutput"><span class="identifier">LessThanComparable</span></code>,
1508               <code class="computeroutput"><span class="identifier">DefaultConstructible</span></code>,
1509               <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>,
1510               <code class="computeroutput"><span class="identifier">CopyAssignable</span></code>, <code class="computeroutput"><span class="identifier">Destructible</span></code>, and the requirements
1511               of numeric types.
1512             </li>
1513 </ul></div>
1514 <div class="note"><table border="0" summary="Note">
1515 <tr>
1516 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../doc/src/images/note.png"></td>
1517 <th align="left">Note</th>
1518 </tr>
1519 <tr><td align="left" valign="top"><p>
1520             This means, in particular, that operations on these types will not throw
1521             exceptions.
1522           </p></td></tr>
1523 </table></div>
1524 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
1525 <li class="listitem">
1526               lvalues of the types <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">rep</span></code>,
1527               <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">duration</span></code>, and <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">time_point</span></code>
1528               are swappable,
1529             </li>
1530 <li class="listitem">
1531               the function <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>
1532               does not throw exceptions and it is thread-safe, and
1533             </li>
1534 <li class="listitem">
1535               the type <code class="computeroutput"><span class="identifier">TC</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">::</span><span class="identifier">clock</span></code> meets the <code class="computeroutput"><span class="identifier">TrivialClock</span></code>
1536               requirements, recursively.
1537             </li>
1538 </ul></div>
1539 <p>
1540           Models of <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">TrivialClock</span></code></a>:
1541         </p>
1542 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
1543 <li class="listitem">
1544               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a>
1545             </li>
1546 <li class="listitem">
1547               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a>
1548             </li>
1549 <li class="listitem">
1550               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock" title="Class high_resolution_clock"><code class="computeroutput"><span class="identifier">high_resolution_clock</span></code></a>
1551             </li>
1552 <li class="listitem">
1553               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>
1554             </li>
1555 <li class="listitem">
1556               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock"><code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a>
1557             </li>
1558 <li class="listitem">
1559               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a>
1560             </li>
1561 <li class="listitem">
1562               <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a>
1563             </li>
1564 </ul></div>
1565 </div>
1566 <div class="section">
1567 <div class="titlepage"><div><div><h4 class="title">
1568 <a name="chrono.reference.cpp0x.ecclock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.ecclock" title="EcClock Requirements"><code class="computeroutput"><span class="identifier">EcClock</span></code>
1569         Requirements</a>
1570 </h4></div></div></div>
1571 <p>
1572           A type <code class="computeroutput"><span class="identifier">EcC</span></code> meets the <code class="computeroutput"><span class="identifier">EcClock</span></code> requirements if
1573         </p>
1574 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
1575 <li class="listitem">
1576               <code class="computeroutput"><span class="identifier">TC</span></code> satisfies the <code class="computeroutput"><span class="identifier">TrivialClock</span> </code> requirements, and
1577             </li>
1578 <li class="listitem">
1579               it adds <code class="computeroutput"><span class="identifier">now</span><span class="special">()</span></code>
1580               interfaces allowing to recover internal error codes as described in
1581               the following table.
1582             </li>
1583 <li class="listitem">
1584               the added now() function is thread-safe.
1585             </li>
1586 </ul></div>
1587 <p>
1588           In this table <code class="computeroutput"><span class="identifier">C1</span></code> denotes
1589           a <code class="computeroutput"><span class="identifier">EcClock</span></code> type and <code class="computeroutput"><span class="identifier">ec</span></code> is an instance of a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span></code>.
1590         </p>
1591 <div class="table">
1592 <a name="chrono.reference.cpp0x.ecclock.clock_requirements"></a><p class="title"><b>Table&#160;8.2.&#160;Clock Requirements</b></p>
1593 <div class="table-contents"><table class="table" summary="Clock Requirements">
1594 <colgroup>
1595 <col>
1596 <col>
1597 <col>
1598 </colgroup>
1599 <thead><tr>
1600 <th>
1601                   <p>
1602                     expression
1603                   </p>
1604                 </th>
1605 <th>
1606                   <p>
1607                     return type
1608                   </p>
1609                 </th>
1610 <th>
1611                   <p>
1612                     operational semantics
1613                   </p>
1614                 </th>
1615 </tr></thead>
1616 <tbody>
1617 <tr>
1618 <td>
1619                   <p>
1620                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">now</span><span class="special">(</span><span class="identifier">ec</span><span class="special">)</span></code>
1621                   </p>
1622                 </td>
1623 <td>
1624                   <p>
1625                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">time_point</span></code>
1626                   </p>
1627                 </td>
1628 <td>
1629                   <p>
1630                     Returns a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> representing
1631                     the current point in time. <code class="computeroutput"><span class="identifier">ec</span></code>
1632                     will stores the error-code in case something was wrong internally.
1633                   </p>
1634                 </td>
1635 </tr>
1636 <tr>
1637 <td>
1638                   <p>
1639                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">now</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">throws</span><span class="special">())</span></code>
1640                   </p>
1641                 </td>
1642 <td>
1643                   <p>
1644                     <code class="computeroutput"><span class="identifier">C1</span><span class="special">::</span><span class="identifier">time_point</span></code>
1645                   </p>
1646                 </td>
1647 <td>
1648                   <p>
1649                     Returns a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> representing
1650                     the current point in time. Throws a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">system_error</span></code>
1651                     exception in case something was wrong internally.
1652                   </p>
1653                 </td>
1654 </tr>
1655 </tbody>
1656 </table></div>
1657 </div>
1658 <br class="table-break"><p>
1659           Models of <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>:
1660         </p>
1661 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
1662 <li class="listitem">
1663               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a>
1664             </li>
1665 <li class="listitem">
1666               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a>
1667             </li>
1668 <li class="listitem">
1669               <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock" title="Class high_resolution_clock"><code class="computeroutput"><span class="identifier">high_resolution_clock</span></code></a>
1670             </li>
1671 <li class="listitem">
1672               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>
1673             </li>
1674 <li class="listitem">
1675               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock"><code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a>
1676             </li>
1677 <li class="listitem">
1678               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a>
1679             </li>
1680 <li class="listitem">
1681               <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock" title="Class process_cpu_clock"><code class="computeroutput"><span class="identifier">process_cpu_clock</span></code></a>
1682             </li>
1683 <li class="listitem">
1684               <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a>
1685             </li>
1686 </ul></div>
1687 </div>
1688 <div class="section">
1689 <div class="titlepage"><div><div><h4 class="title">
1690 <a name="chrono.reference.cpp0x.time_point_hpp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp" title="Header &lt;boost/chrono/time_point.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">time_point</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
1691 </h4></div></div></div>
1692 <div class="toc"><dl class="toc">
1693 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.time_point_hpp.common_type_spe2"><code class="computeroutput"><span class="identifier">common_type</span></code> specialization</a></span></dt>
1694 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point">Class
1695           template <code class="computeroutput"><span class="identifier">time_point</span><span class="special">&lt;&gt;</span></code></a></span></dt>
1696 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith"><code class="computeroutput"><span class="identifier">time_point</span></code> non-member arithmetic</a></span></dt>
1697 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp"><code class="computeroutput"><span class="identifier">time_point</span></code> non-member comparisons</a></span></dt>
1698 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point_cast">Non-Member
1699           Function <code class="computeroutput"><span class="identifier">time_point_cast</span><span class="special">(</span><span class="identifier">time_point</span><span class="special">)</span></code></a></span></dt>
1700 </dl></div>
1701 <p>
1702           This file contains <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> specific classes and
1703           non-member functions.
1704         </p>
1705 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
1706   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
1707
1708     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&gt;</span>
1709     <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">;</span>
1710
1711   <span class="special">}</span>
1712   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1713   <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.common_type_spe" title="common_type Specialization"><code class="computeroutput"><span class="identifier">common_type</span></code></a><span class="special">&lt;</span><span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;,</span>
1714                      <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
1715
1716   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
1717
1718     <span class="comment">// time_point arithmetic</span>
1719     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1720     <span class="keyword">constexpr</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">Duration1</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span>
1721     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_plus_1" title="Non-Member Function operator+(time_point,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">+</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1722               <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1723
1724     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1725     <span class="keyword">constexpr</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <span class="identifier">Duration2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span>
1726     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_plus_2" title="Non-Member Function operator+(duration,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">+</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1727               <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1728
1729     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
1730     <span class="keyword">constexpr</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">Duration1</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span>
1731     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_minus_1" title="Non-Member Function operator-(time_point,duration)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">-</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1732               <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1733
1734     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1735     <span class="keyword">constexpr</span> <span class="keyword">typename</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">Duration1</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;::</span><span class="identifier">type</span>
1736     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_minus_2" title="Non-Member Function operator-(time_point,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">-</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1737               <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1738
1739     <span class="comment">// time_point comparisons</span>
1740     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1741     <span class="keyword">constexpr</span> <span class="keyword">bool</span>
1742     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_eq" title="Non-Member Function operator==(time_point,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">==</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1743                <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1744     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1745     <span class="keyword">constexpr</span> <span class="keyword">bool</span>
1746     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_neq" title="Non-Member Function operator!=(time_point,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">!=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1747                <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1748     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1749     <span class="keyword">constexpr</span> <span class="keyword">bool</span>
1750     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_lt" title="Non-Member Function operator&lt;(time_point,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1751               <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1752     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1753     <span class="keyword">constexpr</span> <span class="keyword">bool</span>
1754     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_leq" title="Non-Member Function operator&lt;=(time_point,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1755                <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1756     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1757     <span class="keyword">constexpr</span> <span class="keyword">bool</span>
1758     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_gt" title="Non-Member Function operator&gt;(time_point,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1759               <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1760     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1761     <span class="keyword">constexpr</span> <span class="keyword">bool</span>
1762     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_geq" title="Non-Member Function operator&gt;=(time_point,time_point)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
1763                <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
1764
1765     <span class="comment">// time_point_cast</span>
1766     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">ToDuration</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
1767     <span class="keyword">constexpr</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">ToDuration</span><span class="special">&gt;</span>
1768     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point_cast" title="Non-Member Function time_point_cast(time_point)"><code class="computeroutput"><span class="identifier">time_point_cast</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;&amp;</span> <span class="identifier">t</span><span class="special">);</span>
1769
1770   <span class="special">}</span>
1771 <span class="special">}</span>
1772 </pre>
1773 <div class="section">
1774 <div class="titlepage"><div><div><h5 class="title">
1775 <a name="chrono.reference.cpp0x.time_point_hpp.common_type_spe2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.common_type_spe2" title="common_type specialization"><code class="computeroutput"><span class="identifier">common_type</span></code> specialization</a>
1776 </h5></div></div></div>
1777 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1778 <span class="keyword">struct</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;,</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span> <span class="special">&gt;</span>
1779 <span class="special">{</span>
1780     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Duration1</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span> <span class="identifier">type</span><span class="special">;</span>
1781 <span class="special">};</span>
1782 </pre>
1783 <p>
1784             The <code class="computeroutput"><span class="identifier">common_type</span></code> of two
1785             <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>s is a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> with the same <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
1786             (both have the same <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>), and the <code class="computeroutput"><span class="identifier">common_type</span></code> of the two <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>s.
1787           </p>
1788 </div>
1789 <div class="section">
1790 <div class="titlepage"><div><div><h5 class="title">
1791 <a name="chrono.reference.cpp0x.time_point_hpp.time_point"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;">Class
1792           template <code class="computeroutput"><span class="identifier">time_point</span><span class="special">&lt;&gt;</span></code></a>
1793 </h5></div></div></div>
1794 <p>
1795             A <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> represents a point
1796             in time with respect to a specific clock.
1797           </p>
1798 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
1799 <span class="keyword">class</span> <span class="identifier">time_point</span> <span class="special">{</span>
1800 <span class="keyword">public</span><span class="special">:</span>
1801     <span class="keyword">typedef</span> <span class="identifier">Clock</span>                     <span class="identifier">clock</span><span class="special">;</span>
1802     <span class="keyword">typedef</span> <span class="identifier">Duration</span>                  <span class="identifier">duration</span><span class="special">;</span>
1803     <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>    <span class="identifier">rep</span><span class="special">;</span>
1804     <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span> <span class="identifier">period</span><span class="special">;</span>
1805 <span class="keyword">private</span><span class="special">:</span>
1806     <span class="identifier">duration</span> <span class="identifier">d_</span><span class="special">;</span> <span class="comment">// exposition only</span>
1807 <span class="keyword">public</span><span class="special">:</span>
1808     <span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_1" title="Constructor time_point()"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">();</span>
1809
1810     <span class="keyword">constexpr</span> <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_2" title="Constructor time_point(const duration&amp;)"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1811
1812     <span class="comment">// conversions</span>
1813     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1814     <span class="keyword">constexpr</span>
1815     <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_3" title="Copy Constructor time_point(const time_point&amp;)"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">clock</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">t</span><span class="special">);</span>
1816
1817     <span class="comment">// observer</span>
1818     <span class="keyword">constexpr</span> <span class="identifier">duration</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_since_epoch" title="Member Function time_since_epoch() const"><code class="computeroutput"><span class="identifier">time_since_epoch</span></code></a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
1819
1820     <span class="comment">// arithmetic</span>
1821
1822     <span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CHRONO_EXTENSIONS</span>
1823     <span class="keyword">constexpr</span> <span class="identifier">time_point</span>  <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_unary_plus" title="Member Function operator+() const"><code class="computeroutput"><span class="keyword">operator</span><span class="special">+</span></code></a><span class="special">();</span>
1824     <span class="keyword">constexpr</span> <span class="identifier">time_point</span>  <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_unary_minus" title="Member Function operator-() const"><code class="computeroutput"><span class="keyword">operator</span><span class="special">-</span></code></a><span class="special">();</span>
1825     <span class="identifier">time_point</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_pre_inc" title="Member Function operator++()"><code class="computeroutput"><span class="keyword">operator</span><span class="special">++</span></code></a><span class="special">();</span>
1826     <span class="identifier">time_point</span>  <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_post_inc" title="Member Function operator++(int)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">++</span></code></a><span class="special">(</span><span class="keyword">int</span><span class="special">);</span>
1827     <span class="identifier">time_point</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_pre_dec" title="Member Function operator--()"><code class="computeroutput"><span class="keyword">operator</span><span class="special">--</span></code></a><span class="special">();</span>
1828     <span class="identifier">time_point</span>  <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_post_dec" title="Member Function operator--(int)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">--</span></code></a><span class="special">(</span><span class="keyword">int</span><span class="special">);</span>
1829
1830     <span class="identifier">time_point</span><span class="special">&amp;</span> <span class="identifier">__time_point__op_plus_eq_1</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1831     <span class="identifier">time_point</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_minus_eq_1" title="Member Function operator-=(const rep&amp;)"><code class="computeroutput"><span class="keyword">operator</span><span class="special">-=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1832     <span class="preprocessor">#endif</span>
1833
1834     <span class="identifier">time_point</span><span class="special">&amp;</span> <span class="identifier">__time_point__op_plus_eq_2</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1835     <span class="identifier">time_point</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_minus_eq_2" title="Member Function operator-="><code class="computeroutput"><span class="keyword">operator</span><span class="special">-=</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1836
1837     <span class="comment">// special values</span>
1838
1839     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">time_point</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.min" title="Static Member Function min"><code class="computeroutput"><span class="identifier">min</span></code></a><span class="special">();</span>
1840     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">time_point</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.max" title="Static Member Function max"><code class="computeroutput"><span class="identifier">max</span></code></a><span class="special">();</span>
1841 <span class="special">};</span>
1842 </pre>
1843 <p>
1844             Clock must meet the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a> requirements.
1845           </p>
1846 <p>
1847             Duration must be an instantiation of <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>, compile diagnostic
1848             otherwise.
1849           </p>
1850 <div class="section">
1851 <div class="titlepage"><div><div><h6 class="title">
1852 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_1" title="Constructor time_point()">Constructor
1853             <code class="computeroutput"><span class="identifier">time_point</span><span class="special">()</span></code></a>
1854 </h6></div></div></div>
1855 <pre class="programlisting"><span class="keyword">constexpr</span> <span class="identifier">time_point</span><span class="special">();</span>
1856 </pre>
1857 <p>
1858               <span class="bold"><strong>Effects:</strong></span> Constructs an object of
1859               <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>, initializing
1860               <code class="computeroutput"><span class="identifier">d_</span></code> with <code class="computeroutput"><span class="identifier">duration</span><span class="special">::</span><span class="identifier">zero</span><span class="special">()</span></code>.
1861               This <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> represents the
1862               epoch.
1863             </p>
1864 </div>
1865 <div class="section">
1866 <div class="titlepage"><div><div><h6 class="title">
1867 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_2" title="Constructor time_point(const duration&amp;)">Constructor
1868             <code class="computeroutput"><span class="identifier">time_point</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;)</span></code></a>
1869 </h6></div></div></div>
1870 <pre class="programlisting"><span class="keyword">constexpr</span> <span class="identifier">time_point</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
1871 </pre>
1872 <p>
1873               <span class="bold"><strong>Effects:</strong></span> Constructs an object of
1874               <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>, initializing
1875               <code class="computeroutput"><span class="identifier">d_</span></code> with <code class="computeroutput"><span class="identifier">d</span></code>. This <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> represents the
1876               epoch <code class="computeroutput"><span class="special">+</span> <span class="identifier">d</span></code>.
1877             </p>
1878 </div>
1879 <div class="section">
1880 <div class="titlepage"><div><div><h6 class="title">
1881 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_3"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_point_c_3" title="Copy Constructor time_point(const time_point&amp;)">Copy
1882             Constructor <code class="computeroutput"><span class="identifier">time_point</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&amp;)</span></code></a>
1883 </h6></div></div></div>
1884 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
1885 <span class="keyword">constexpr</span>
1886 <span class="identifier">time_point</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">clock</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">t</span><span class="special">);</span>
1887 </pre>
1888 <p>
1889               <span class="bold"><strong>Requires:</strong></span> This function will not participate
1890               in overload resolution unless <code class="computeroutput"><span class="identifier">Duration2</span></code>
1891               is implicitly convertible to <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
1892             </p>
1893 <p>
1894               <span class="bold"><strong>Effects:</strong></span> Constructs an object of
1895               <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>, initializing
1896               <code class="computeroutput"><span class="identifier">d_</span></code> with <code class="computeroutput"><span class="identifier">t</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">()</span></code>.
1897             </p>
1898 </div>
1899 <div class="section">
1900 <div class="titlepage"><div><div><h6 class="title">
1901 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.time_since_epoch"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.time_since_epoch" title="Member Function time_since_epoch() const">Member
1902             Function <code class="computeroutput"><span class="identifier">time_since_epoch</span><span class="special">()</span> <span class="keyword">const</span></code></a>
1903 </h6></div></div></div>
1904 <pre class="programlisting"><span class="keyword">constexpr</span> <span class="identifier">duration</span> <span class="identifier">time_since_epoch</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
1905 </pre>
1906 <p>
1907               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">d_</span></code>.
1908             </p>
1909 </div>
1910 <div class="section">
1911 <div class="titlepage"><div><div><h6 class="title">
1912 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_unary_plus"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_unary_plus" title="Member Function operator+() const">Member
1913             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+()</span>
1914             <span class="keyword">const</span></code></a>
1915 </h6></div></div></div>
1916 <pre class="programlisting"><span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> <span class="keyword">operator</span><span class="special">+()</span> <span class="keyword">const</span><span class="special">;</span>
1917 </pre>
1918 <p>
1919               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
1920             </p>
1921 </div>
1922 <div class="section">
1923 <div class="titlepage"><div><div><h6 class="title">
1924 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_unary_minus"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_unary_minus" title="Member Function operator-() const">Member
1925             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-()</span>
1926             <span class="keyword">const</span></code></a>
1927 </h6></div></div></div>
1928 <pre class="programlisting"><span class="keyword">constexpr</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> <span class="keyword">operator</span><span class="special">-()</span> <span class="keyword">const</span><span class="special">;</span>
1929 </pre>
1930 <p>
1931               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">(-</span><span class="identifier">d_</span><span class="special">)</span></code>.
1932             </p>
1933 </div>
1934 <div class="section">
1935 <div class="titlepage"><div><div><h6 class="title">
1936 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_pre_inc"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_pre_inc" title="Member Function operator++()">Member
1937             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">++()</span></code></a>
1938 </h6></div></div></div>
1939 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">++();</span>
1940 </pre>
1941 <p>
1942               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="special">++</span><span class="identifier">d_</span></code>.
1943             </p>
1944 <p>
1945               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
1946             </p>
1947 </div>
1948 <div class="section">
1949 <div class="titlepage"><div><div><h6 class="title">
1950 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_post_inc"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_post_inc" title="Member Function operator++(int)">Member
1951             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">++(</span><span class="keyword">int</span><span class="special">)</span></code></a>
1952 </h6></div></div></div>
1953 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> <span class="keyword">operator</span><span class="special">++(</span><span class="keyword">int</span><span class="special">);</span>
1954 </pre>
1955 <p>
1956               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">(</span><span class="identifier">d_</span><span class="special">++)</span></code>.
1957             </p>
1958 </div>
1959 <div class="section">
1960 <div class="titlepage"><div><div><h6 class="title">
1961 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_pre_dec"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_pre_dec" title="Member Function operator--()">Member
1962             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">--()</span></code></a>
1963 </h6></div></div></div>
1964 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">--();</span>
1965 </pre>
1966 <p>
1967               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="special">--</span><span class="identifier">d_</span></code>.
1968             </p>
1969 <p>
1970               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
1971             </p>
1972 </div>
1973 <div class="section">
1974 <div class="titlepage"><div><div><h6 class="title">
1975 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_post_dec"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_post_dec" title="Member Function operator--(int)">Member
1976             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">--(</span><span class="keyword">int</span><span class="special">)</span></code></a>
1977 </h6></div></div></div>
1978 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> <span class="keyword">operator</span><span class="special">--(</span><span class="keyword">int</span><span class="special">);</span>
1979 </pre>
1980 <p>
1981               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">(</span><span class="identifier">d_</span><span class="special">--)</span></code>.
1982             </p>
1983 </div>
1984 <div class="section">
1985 <div class="titlepage"><div><div><h6 class="title">
1986 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_plus_eq_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_plus_eq_1" title="Member Function operator+=(const rep&amp;)">Member
1987             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;)</span></code></a>
1988 </h6></div></div></div>
1989 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">+=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">);</span>
1990 </pre>
1991 <p>
1992               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">d_</span>
1993               <span class="special">+=</span> <span class="identifier">duration</span><span class="special">(</span><span class="identifier">r</span><span class="special">)</span></code>.
1994             </p>
1995 <p>
1996               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
1997             </p>
1998 </div>
1999 <div class="section">
2000 <div class="titlepage"><div><div><h6 class="title">
2001 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_minus_eq_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_minus_eq_1" title="Member Function operator-=(const rep&amp;)">Member
2002             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;)</span></code></a>
2003 </h6></div></div></div>
2004 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">-=(</span><span class="keyword">const</span> <span class="identifier">rep</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">);</span>
2005 </pre>
2006 <p>
2007               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">d_</span>
2008               <span class="special">-=</span> <span class="identifier">duration</span><span class="special">(</span><span class="identifier">r</span><span class="special">)</span></code>
2009             </p>
2010 <p>
2011               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
2012             </p>
2013 </div>
2014 <div class="section">
2015 <div class="titlepage"><div><div><h6 class="title">
2016 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_plus_eq_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_plus_eq_2" title="Member Function operator+=">Member
2017             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+=</span></code></a>
2018 </h6></div></div></div>
2019 <pre class="programlisting"><span class="identifier">time_point</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">+=(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
2020 </pre>
2021 <p>
2022               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">d_</span>
2023               <span class="special">+=</span> <span class="identifier">d</span></code>.
2024             </p>
2025 <p>
2026               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
2027             </p>
2028 </div>
2029 <div class="section">
2030 <div class="titlepage"><div><div><h6 class="title">
2031 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.op_minus_eq_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.op_minus_eq_2" title="Member Function operator-=">Member
2032             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-=</span></code></a>
2033 </h6></div></div></div>
2034 <pre class="programlisting"><span class="identifier">time_point</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">-=(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
2035 </pre>
2036 <p>
2037               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">d_</span>
2038               <span class="special">-=</span> <span class="identifier">d</span></code>
2039             </p>
2040 <p>
2041               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
2042             </p>
2043 </div>
2044 <div class="section">
2045 <div class="titlepage"><div><div><h6 class="title">
2046 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.min"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.min" title="Static Member Function min">Static
2047             Member Function <code class="computeroutput"><span class="identifier">min</span></code></a>
2048 </h6></div></div></div>
2049 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">time_point</span> <span class="identifier">min</span><span class="special">();</span>
2050 </pre>
2051 <p>
2052               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">time_point</span><span class="special">(</span><span class="identifier">duration</span><span class="special">::</span><span class="identifier">min</span><span class="special">())</span></code>.
2053             </p>
2054 </div>
2055 <div class="section">
2056 <div class="titlepage"><div><div><h6 class="title">
2057 <a name="chrono.reference.cpp0x.time_point_hpp.time_point.max"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point.max" title="Static Member Function max">Static
2058             Member Function <code class="computeroutput"><span class="identifier">max</span></code></a>
2059 </h6></div></div></div>
2060 <pre class="programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">time_point</span> <span class="identifier">max</span><span class="special">();</span>
2061 </pre>
2062 <p>
2063               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">time_point</span><span class="special">(</span><span class="identifier">duration</span><span class="special">::</span><span class="identifier">max</span><span class="special">())</span></code>.
2064             </p>
2065 </div>
2066 </div>
2067 <div class="section">
2068 <div class="titlepage"><div><div><h5 class="title">
2069 <a name="chrono.reference.cpp0x.time_point_hpp.arith"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith" title="time_point non-member arithmetic"><code class="computeroutput"><span class="identifier">time_point</span></code> non-member arithmetic</a>
2070 </h5></div></div></div>
2071 <div class="section">
2072 <div class="titlepage"><div><div><h6 class="title">
2073 <a name="chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_plus_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_plus_1" title="Non-Member Function operator+(time_point,duration)">Non-Member
2074             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
2075 </h6></div></div></div>
2076 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
2077 <span class="keyword">constexpr</span>
2078 <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Duration1</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span>
2079 <span class="keyword">operator</span><span class="special">+(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2080           <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2081 </pre>
2082 <p>
2083               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">CT</span><span class="special">(</span><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">rhs</span><span class="special">)</span></code>
2084               where <code class="computeroutput"><span class="identifier">CT</span></code> is the type
2085               of the return value.
2086             </p>
2087 </div>
2088 <div class="section">
2089 <div class="titlepage"><div><div><h6 class="title">
2090 <a name="chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_plus_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_plus_2" title="Non-Member Function operator+(duration,time_point)">Non-Member
2091             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">+(</span><span class="identifier">duration</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2092 </h6></div></div></div>
2093 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep1</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period1</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2094 <span class="keyword">constexpr</span>
2095 <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span>
2096 <span class="keyword">operator</span><span class="special">+(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep1</span><span class="special">,</span> <span class="identifier">Period1</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2097           <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2098 </pre>
2099 <p>
2100               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">rhs</span>
2101               <span class="special">+</span> <span class="identifier">lhs</span></code>.
2102             </p>
2103 </div>
2104 <div class="section">
2105 <div class="titlepage"><div><div><h6 class="title">
2106 <a name="chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_minus_1"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_minus_1" title="Non-Member Function operator-(time_point,duration)">Non-Member
2107             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">duration</span><span class="special">)</span></code></a>
2108 </h6></div></div></div>
2109 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep2</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period2</span><span class="special">&gt;</span>
2110 <span class="keyword">constexpr</span>
2111 <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Duration1</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span>
2112 <span class="keyword">operator</span><span class="special">-(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2113           <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">,</span> <span class="identifier">Period2</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2114 </pre>
2115 <p>
2116               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">lhs</span>
2117               <span class="special">+</span> <span class="special">(-</span><span class="identifier">rhs</span><span class="special">)</span></code>.
2118             </p>
2119 </div>
2120 <div class="section">
2121 <div class="titlepage"><div><div><h6 class="title">
2122 <a name="chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_minus_2"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.arith.time_point__op_minus_2" title="Non-Member Function operator-(time_point,time_point)">Non-Member
2123             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">-(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2124 </h6></div></div></div>
2125 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2126 <span class="keyword">constexpr</span>
2127 <span class="keyword">typename</span> <code class="computeroutput"><span class="identifier">common_type</span></code><span class="special">&lt;</span><span class="identifier">Duration1</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;::</span><span class="identifier">type</span>
2128 <span class="keyword">operator</span><span class="special">-(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2129           <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2130 </pre>
2131 <p>
2132               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">()</span> <span class="special">-</span> <span class="identifier">rhs</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">()</span></code>.
2133             </p>
2134 </div>
2135 </div>
2136 <div class="section">
2137 <div class="titlepage"><div><div><h5 class="title">
2138 <a name="chrono.reference.cpp0x.time_point_hpp.cmp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp" title="time_point non-member comparisons"><code class="computeroutput"><span class="identifier">time_point</span></code> non-member comparisons</a>
2139 </h5></div></div></div>
2140 <div class="section">
2141 <div class="titlepage"><div><div><h6 class="title">
2142 <a name="chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_eq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_eq" title="Non-Member Function operator==(time_point,time_point)">Non-Member
2143             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">==(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2144 </h6></div></div></div>
2145 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2146 <span class="keyword">constexpr</span>
2147 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2148                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2149 </pre>
2150 <p>
2151               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">rhs</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">()</span></code>.
2152             </p>
2153 </div>
2154 <div class="section">
2155 <div class="titlepage"><div><div><h6 class="title">
2156 <a name="chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_neq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_neq" title="Non-Member Function operator!=(time_point,time_point)">Non-Member
2157             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">!=(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2158 </h6></div></div></div>
2159 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2160 <span class="keyword">constexpr</span>
2161 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2162                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2163 </pre>
2164 <p>
2165               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special">==</span>
2166               <span class="identifier">rhs</span><span class="special">)</span></code>.
2167             </p>
2168 </div>
2169 <div class="section">
2170 <div class="titlepage"><div><div><h6 class="title">
2171 <a name="chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_lt"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_lt" title="Non-Member Function operator&lt;(time_point,time_point)">Non-Member
2172             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2173 </h6></div></div></div>
2174 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2175 <span class="keyword">constexpr</span>
2176 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;</span> <span class="special">(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2177                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2178 </pre>
2179 <p>
2180               <span class="bold"><strong>Returns:</strong></span> lhs.time_since_epoch() &lt;
2181               rhs.time_since_epoch().
2182             </p>
2183 </div>
2184 <div class="section">
2185 <div class="titlepage"><div><div><h6 class="title">
2186 <a name="chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_leq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_leq" title="Non-Member Function operator&lt;=(time_point,time_point)">Non-Member
2187             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;=(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2188 </h6></div></div></div>
2189 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2190 <span class="keyword">constexpr</span>
2191 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2192                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2193 </pre>
2194 <p>
2195               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">!(</span><span class="identifier">rhs</span> <span class="special">&lt;</span>
2196               <span class="identifier">lhs</span><span class="special">)</span></code>.
2197             </p>
2198 </div>
2199 <div class="section">
2200 <div class="titlepage"><div><div><h6 class="title">
2201 <a name="chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_gt"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_gt" title="Non-Member Function operator&gt;(time_point,time_point)">Non-Member
2202             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2203 </h6></div></div></div>
2204 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2205 <span class="keyword">constexpr</span>
2206 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2207                <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2208 </pre>
2209 <p>
2210               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">rhs</span>
2211               <span class="special">&lt;</span> <span class="identifier">lhs</span></code>.
2212             </p>
2213 </div>
2214 <div class="section">
2215 <div class="titlepage"><div><div><h6 class="title">
2216 <a name="chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_geq"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.cmp.time_point__op_geq" title="Non-Member Function operator&gt;=(time_point,time_point)">Non-Member
2217             Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;=(</span><span class="identifier">time_point</span><span class="special">,</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2218 </h6></div></div></div>
2219 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;</span>
2220 <span class="keyword">constexpr</span>
2221 <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;=(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration1</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
2222                 <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration2</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
2223 </pre>
2224 <p>
2225               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span> <span class="special">&lt;</span>
2226               <span class="identifier">rhs</span><span class="special">)</span></code>.
2227             </p>
2228 </div>
2229 </div>
2230 <div class="section">
2231 <div class="titlepage"><div><div><h5 class="title">
2232 <a name="chrono.reference.cpp0x.time_point_hpp.time_point_cast"></a><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point_cast" title="Non-Member Function time_point_cast(time_point)">Non-Member
2233           Function <code class="computeroutput"><span class="identifier">time_point_cast</span><span class="special">(</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2234 </h5></div></div></div>
2235 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">ToDuration</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
2236 <span class="keyword">constexpr</span>
2237 <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="identifier">ToDuration</span><span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point_cast" title="Non-Member Function time_point_cast(time_point)"><code class="computeroutput"><span class="identifier">time_point_cast</span></code></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">t</span><span class="special">);</span>
2238 </pre>
2239 <p>
2240             <span class="bold"><strong>Requires:</strong></span> This function will not participate
2241             in overload resolution unless <code class="computeroutput"><span class="identifier">ToDuration</span></code>
2242             is an instantiation of <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>.
2243           </p>
2244 <p>
2245             <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="identifier">ToDuration</span><span class="special">&gt;(</span><a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_cast" title="Non-Member Function duration_cast(duration)"><code class="computeroutput"><span class="identifier">duration_cast</span></code></a><span class="special">&lt;</span><span class="identifier">ToDuration</span><span class="special">&gt;(</span><span class="identifier">t</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">()))</span></code>.
2246           </p>
2247 </div>
2248 </div>
2249 <div class="section">
2250 <div class="titlepage"><div><div><h4 class="title">
2251 <a name="chrono.reference.cpp0x.system_clocks_hpp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp" title="Header &lt;boost/chrono/system_clocks.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">system_clocks</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2252 </h4></div></div></div>
2253 <div class="toc"><dl class="toc">
2254 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock">Class
2255           <code class="computeroutput"><span class="identifier">system_clock</span></code></a></span></dt>
2256 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.BOOST_CHRONO_HAS_CLOCK_STEADY">Macro
2257           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_HAS_CLOCK_STEADY</span></code></a></span></dt>
2258 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock">Class
2259           <code class="computeroutput"><span class="identifier">steady_clock</span></code></a></span></dt>
2260 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock">Class
2261           <code class="computeroutput"><span class="identifier">high_resolution_clock</span></code></a></span></dt>
2262 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.clock_string_system_clock"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">&gt;</span></code>
2263           Specialization</a></span></dt>
2264 <dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.clock_string_steady_clock"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">steady_clock</span><span class="special">&gt;</span></code>
2265           Specialization</a></span></dt>
2266 </dl></div>
2267 <p>
2268           This file contains the standard clock classes. The types defined in this
2269           section satisfy the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">TrivialClock</span></code></a> requirements
2270         </p>
2271 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
2272   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
2273
2274     <span class="comment">// Clocks</span>
2275     <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a><span class="special">;</span>
2276     <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a><span class="special">;</span>
2277     <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock" title="Class high_resolution_clock"><code class="computeroutput"><span class="identifier">high_resolution_clock</span></code></a><span class="special">;</span>
2278
2279     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2280     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;;</span>
2281     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2282     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">steady_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;;</span>
2283
2284   <span class="special">}</span>
2285 <span class="special">}</span>
2286 </pre>
2287 <div class="section">
2288 <div class="titlepage"><div><div><h5 class="title">
2289 <a name="chrono.reference.cpp0x.system_clocks_hpp.system_clock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock">Class
2290           <code class="computeroutput"><span class="identifier">system_clock</span></code></a>
2291 </h5></div></div></div>
2292 <p>
2293             The <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a> class provides
2294             a means of obtaining the current wall-clock time from the system-wide
2295             real-time clock. The current time can be obtained by calling <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>.
2296             Instances of <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">time_point</span></code>
2297             can be converted to and from time_t with the <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">to_time_t</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">from_time_t</span><span class="special">()</span></code> functions. If system clock is not steady,
2298             a subsequent call to <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code> may return an earlier time than a previous
2299             call (e.g. if the operating system clock is manually adjusted, or synchronized
2300             with an external clock).
2301           </p>
2302 <p>
2303             The current implementation of <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a> is related an epoch
2304             (midnight UTC of January 1, 1970), but this is not in the contract. You
2305             need to use the static function static
2306           </p>
2307 <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">time_t</span> <span class="identifier">to_time_t</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
2308 </pre>
2309 <p>
2310             which returns a <code class="computeroutput"><span class="identifier">time_t</span></code>
2311             type that is based on midnight UTC of January 1, 1970.
2312           </p>
2313 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">system_clock</span> <span class="special">{</span>
2314 <span class="keyword">public</span><span class="special">:</span>
2315     <span class="keyword">typedef</span> <span class="emphasis"><em>see bellow</em></span>          <span class="identifier">duration</span><span class="special">;</span>
2316     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>                        <span class="identifier">rep</span><span class="special">;</span>
2317     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span>                     <span class="identifier">period</span><span class="special">;</span>
2318     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">&gt;</span>     <span class="identifier">time_point</span><span class="special">;</span>
2319     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_steady</span> <span class="special">=</span>            <span class="keyword">false</span><span class="special">;</span>
2320
2321
2322     <span class="keyword">static</span> <span class="identifier">time_point</span>  <span class="identifier">now</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
2323     <span class="keyword">static</span> <span class="identifier">time_point</span>  <span class="identifier">now</span><span class="special">(</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">);</span>
2324
2325     <span class="comment">// Map to C API</span>
2326     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">time_t</span> <span class="identifier">to_time_t</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
2327     <span class="keyword">static</span> <span class="identifier">time_point</span>  <span class="identifier">from_time_t</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">time_t</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
2328 <span class="special">};</span>
2329 </pre>
2330 <p>
2331             <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a> satisfy the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
2332             requirements:
2333           </p>
2334 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
2335 <li class="listitem">
2336                 <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">duration</span><span class="special">::</span><span class="identifier">min</span><span class="special">()</span>
2337                 <span class="special">&lt;</span> <span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">duration</span><span class="special">::</span><span class="identifier">zero</span><span class="special">()</span></code> is <code class="computeroutput"><span class="keyword">true</span></code>.
2338               </li>
2339 <li class="listitem">
2340                 The nested <code class="computeroutput"><span class="identifier">duration</span></code>
2341                 typedef has a resolution that depends on the one provided by the
2342                 platform.
2343               </li>
2344 </ul></div>
2345 <div class="section">
2346 <div class="titlepage"><div><div><h6 class="title">
2347 <a name="chrono.reference.cpp0x.system_clocks_hpp.system_clock.to_time_t"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock.to_time_t" title="Static Member Function to_time_t(time_point)">Static
2348             Member Function <code class="computeroutput"><span class="identifier">to_time_t</span><span class="special">(</span><span class="identifier">time_point</span><span class="special">)</span></code></a>
2349 </h6></div></div></div>
2350 <pre class="programlisting"><span class="identifier">time_t</span> <span class="identifier">to_time_t</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
2351 </pre>
2352 <p>
2353               <span class="bold"><strong>Returns:</strong></span> A <code class="computeroutput"><span class="identifier">time_t</span></code>
2354               such that the <code class="computeroutput"><span class="identifier">time_t</span></code>
2355               and <code class="computeroutput"><span class="identifier">t</span></code> represent the
2356               same point in time, truncated to the coarser of the precisions among
2357               <code class="computeroutput"><span class="identifier">time_t</span></code> and <code class="computeroutput"><span class="identifier">time_point</span></code>.
2358             </p>
2359 </div>
2360 <div class="section">
2361 <div class="titlepage"><div><div><h6 class="title">
2362 <a name="chrono.reference.cpp0x.system_clocks_hpp.system_clock.from_time_t"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock.from_time_t" title="Static Member Function from_time_t(time_t)">Static
2363             Member Function <code class="computeroutput"><span class="identifier">from_time_t</span><span class="special">(</span><span class="identifier">time_t</span><span class="special">)</span></code></a>
2364 </h6></div></div></div>
2365 <pre class="programlisting"><span class="identifier">time_point</span> <span class="identifier">from_time_t</span><span class="special">(</span><span class="identifier">time_t</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
2366 </pre>
2367 <p>
2368               <span class="bold"><strong>Returns:</strong></span> A <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> such that the
2369               <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> and <code class="computeroutput"><span class="identifier">t</span></code> represent the same point in time,
2370               truncated to the coarser of the precisions among <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> and <code class="computeroutput"><span class="identifier">time_t</span></code>.
2371             </p>
2372 </div>
2373 </div>
2374 <div class="section">
2375 <div class="titlepage"><div><div><h5 class="title">
2376 <a name="chrono.reference.cpp0x.system_clocks_hpp.BOOST_CHRONO_HAS_CLOCK_STEADY"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.BOOST_CHRONO_HAS_CLOCK_STEADY" title="Macro BOOST_CHRONO_HAS_CLOCK_STEADY">Macro
2377           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_HAS_CLOCK_STEADY</span></code></a>
2378 </h5></div></div></div>
2379 <p>
2380             Defined if the platform support steady clocks.
2381           </p>
2382 </div>
2383 <div class="section">
2384 <div class="titlepage"><div><div><h5 class="title">
2385 <a name="chrono.reference.cpp0x.system_clocks_hpp.steady_clock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock">Class
2386           <code class="computeroutput"><span class="identifier">steady_clock</span></code></a>
2387 </h5></div></div></div>
2388 <p>
2389             <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a> satisfy the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
2390             requirements.
2391           </p>
2392 <p>
2393             <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a> class provides
2394             access to the system-wide steady clock. The current time can be obtained
2395             by calling <code class="computeroutput"><span class="identifier">steady_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>. There is no fixed relationship between
2396             values returned by <code class="computeroutput"><span class="identifier">steady_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code> and wall-clock time.
2397           </p>
2398 <pre class="programlisting"><span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_HAS_CLOCK_STEADY</span>
2399     <span class="keyword">class</span> <span class="identifier">steady_clock</span> <span class="special">{</span>
2400     <span class="keyword">public</span><span class="special">:</span>
2401         <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">nanoseconds</span></code></a>                          <span class="identifier">duration</span><span class="special">;</span>
2402         <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>                        <span class="identifier">rep</span><span class="special">;</span>
2403         <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span>                     <span class="identifier">period</span><span class="special">;</span>
2404         <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">steady_clock</span><span class="special">&gt;</span>     <span class="identifier">time_point</span><span class="special">;</span>
2405         <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_steady</span> <span class="special">=</span>            <span class="keyword">true</span><span class="special">;</span>
2406
2407         <span class="keyword">static</span> <span class="identifier">time_point</span>  <span class="identifier">now</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
2408         <span class="keyword">static</span> <span class="identifier">time_point</span>  <span class="identifier">now</span><span class="special">(</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">);</span>
2409     <span class="special">};</span>
2410 <span class="preprocessor">#endif</span>
2411 </pre>
2412 </div>
2413 <div class="section">
2414 <div class="titlepage"><div><div><h5 class="title">
2415 <a name="chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock" title="Class high_resolution_clock">Class
2416           <code class="computeroutput"><span class="identifier">high_resolution_clock</span></code></a>
2417 </h5></div></div></div>
2418 <p>
2419             <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.high_resolution_clock" title="Class high_resolution_clock"><code class="computeroutput"><span class="identifier">high_resolution_clock</span></code></a> satisfy
2420             the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
2421             requirements.
2422           </p>
2423 <pre class="programlisting"><span class="preprocessor">#ifdef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.BOOST_CHRONO_HAS_CLOCK_STEADY" title="Macro BOOST_CHRONO_HAS_CLOCK_STEADY"><code class="computeroutput"><span class="identifier">BOOST_CHRONO_HAS_CLOCK_STEADY</span></code></a>
2424   <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a> <span class="identifier">high_resolution_clock</span><span class="special">;</span>  <span class="comment">// as permitted by [time.clock.hires]</span>
2425 <span class="preprocessor">#else</span>
2426   <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a> <span class="identifier">high_resolution_clock</span><span class="special">;</span>  <span class="comment">// as permitted by [time.clock.hires]</span>
2427 <span class="preprocessor">#endif</span>
2428 </pre>
2429 </div>
2430 <div class="section">
2431 <div class="titlepage"><div><div><h5 class="title">
2432 <a name="chrono.reference.cpp0x.system_clocks_hpp.clock_string_system_clock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.clock_string_system_clock" title="clock_string&lt;system_clock&gt; Specialization"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">&gt;</span></code>
2433           Specialization</a>
2434 </h5></div></div></div>
2435 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2436 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2437 <span class="special">{</span>
2438     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
2439     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
2440 <span class="special">};</span>
2441 </pre>
2442 <p>
2443             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
2444             returns "system_clock".
2445           </p>
2446 <p>
2447             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
2448             returns " since Jan 1, 1970"
2449           </p>
2450 </div>
2451 <div class="section">
2452 <div class="titlepage"><div><div><h5 class="title">
2453 <a name="chrono.reference.cpp0x.system_clocks_hpp.clock_string_steady_clock"></a><a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.clock_string_steady_clock" title="clock_string&lt;steady_clock&gt; Specialization"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">steady_clock</span><span class="special">&gt;</span></code>
2454           Specialization</a>
2455 </h5></div></div></div>
2456 <pre class="programlisting"><span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CHRONO_HAS_CLOCK_STEADY</span>
2457
2458 <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2459 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">steady_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2460 <span class="special">{</span>
2461     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
2462     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
2463 <span class="special">};</span>
2464 <span class="preprocessor">#endif</span>
2465 </pre>
2466 <p>
2467             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
2468             returns "steady_clock".
2469           </p>
2470 <p>
2471             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
2472             returns " since boot"
2473           </p>
2474 </div>
2475 </div>
2476 <div class="section">
2477 <div class="titlepage"><div><div><h4 class="title">
2478 <a name="chrono.reference.cpp0x.clock_strings_hpp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.clock_strings_hpp" title="Header &lt;boost/chrono/clock_strings.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">clock_strings</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2479 </h4></div></div></div>
2480 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.cpp0x.clock_strings_hpp.clock_string">Template
2481           Class <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;</span></code></a></span></dt></dl></div>
2482 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
2483   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
2484
2485     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2486     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">;</span>
2487
2488   <span class="special">}</span>
2489 <span class="special">}</span>
2490 </pre>
2491 <div class="section">
2492 <div class="titlepage"><div><div><h5 class="title">
2493 <a name="chrono.reference.cpp0x.clock_strings_hpp.clock_string"></a><a class="link" href="reference.html#chrono.reference.cpp0x.clock_strings_hpp.clock_string" title="Template Class clock_string&lt;&gt;">Template
2494           Class <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;</span></code></a>
2495 </h5></div></div></div>
2496 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2497 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">;</span>
2498 </pre>
2499 <p>
2500             This template must be specialized for specific clocks. The specialization
2501             must define the following functions
2502           </p>
2503 <pre class="programlisting"><span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
2504 <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
2505 </pre>
2506 <p>
2507             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
2508             return the clock name, which usually corresponds to the class name.
2509           </p>
2510 <p>
2511             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
2512             return the textual format of the clock epoch.
2513           </p>
2514 </div>
2515 </div>
2516 <div class="section">
2517 <div class="titlepage"><div><div><h4 class="title">
2518 <a name="chrono.reference.cpp0x.chrono_typeof_hpp"></a><a class="link" href="reference.html#chrono.reference.cpp0x.chrono_typeof_hpp" title="Header &lt;boost/chrono/typeof/boost/chrono/chrono.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">typeof</span><span class="special">/</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2519 </h4></div></div></div>
2520 <p>
2521           Register <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><code class="computeroutput"><span class="special">&lt;&gt;</span></code>
2522           and <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><code class="computeroutput"><span class="special">&lt;&gt;</span></code>
2523           class templates to <span class="bold"><strong>Boost.Typeof</strong></span>.
2524         </p>
2525 </div>
2526 </div>
2527 <div class="section">
2528 <div class="titlepage"><div><div><h3 class="title">
2529 <a name="chrono.reference.io_v1"></a><a class="link" href="reference.html#chrono.reference.io_v1" title="Chrono I/O V1">Chrono I/O V1</a>
2530 </h3></div></div></div>
2531 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.io_v1.chrono_io_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt></dl></div>
2532 <div class="section">
2533 <div class="titlepage"><div><div><h4 class="title">
2534 <a name="chrono.reference.io_v1.chrono_io_hpp"></a><a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp" title="Header &lt;boost/chrono/chrono_io.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2535 </h4></div></div></div>
2536 <div class="toc"><dl class="toc">
2537 <dt><span class="section"><a href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct">Template
2538           Class <code class="computeroutput"><span class="identifier">duration_punct</span><span class="special">&lt;&gt;</span></code></a></span></dt>
2539 <dt><span class="section"><a href="reference.html#chrono.reference.io_v1.chrono_io_hpp.manipulators">I/O
2540           Manipulators</a></span></dt>
2541 <dt><span class="section"><a href="reference.html#chrono.reference.io_v1.chrono_io_hpp.streams">I/O
2542           Streams Operations</a></span></dt>
2543 </dl></div>
2544 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
2545 <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
2546
2547     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2548     <span class="keyword">class</span> <span class="identifier">duration_punct</span><span class="special">;</span>
2549
2550     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
2551         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2552         <span class="identifier">duration_short</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">);</span>
2553
2554     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
2555         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2556         <span class="identifier">duration_long</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">);</span>
2557
2558     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
2559         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2560         <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
2561
2562     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
2563         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2564         <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span>
2565
2566     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
2567         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2568         <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
2569                <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
2570
2571     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
2572         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2573         <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
2574                <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
2575
2576 <span class="special">}</span>
2577 <span class="special">}</span>
2578 </pre>
2579 <div class="section">
2580 <div class="titlepage"><div><div><h5 class="title">
2581 <a name="chrono.reference.io_v1.chrono_io_hpp.duration_punct"></a><a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;">Template
2582           Class <code class="computeroutput"><span class="identifier">duration_punct</span><span class="special">&lt;&gt;</span></code></a>
2583 </h5></div></div></div>
2584 <p>
2585             The <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> unit names can be customized
2586             through the facet: <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a>. <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> unit names come in
2587             two varieties: long and short. The default constructed <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> provides names
2588             in the long format. These names are English descriptions. Other languages
2589             are supported by constructing a <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> with the proper
2590             spellings for "hours", "minutes" and "seconds",
2591             and their abbreviations (for the short format).
2592           </p>
2593 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2594 <span class="keyword">class</span> <span class="identifier">duration_punct</span>
2595     <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">facet</span>
2596 <span class="special">{</span>
2597 <span class="keyword">public</span><span class="special">:</span>
2598     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span>
2599     <span class="keyword">enum</span> <span class="special">{</span><span class="identifier">use_long</span><span class="special">,</span> <span class="identifier">use_short</span><span class="special">};</span>
2600
2601     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span>
2602
2603     <span class="keyword">explicit</span> <span class="identifier">duration_punct</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">use</span> <span class="special">=</span> <span class="identifier">use_long</span><span class="special">);</span>
2604
2605     <span class="identifier">duration_punct</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">use</span><span class="special">,</span>
2606         <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">&amp;</span> <span class="identifier">long_seconds</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">&amp;</span> <span class="identifier">long_minutes</span><span class="special">,</span>
2607         <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">&amp;</span> <span class="identifier">long_hours</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">&amp;</span> <span class="identifier">short_seconds</span><span class="special">,</span>
2608         <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">&amp;</span> <span class="identifier">short_minutes</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">&amp;</span> <span class="identifier">short_hours</span><span class="special">);</span>
2609
2610     <span class="identifier">duration_punct</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">use</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">duration_punct</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">);</span>
2611
2612     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="identifier">string_type</span> <span class="identifier">short_name</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
2613     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="identifier">string_type</span> <span class="identifier">long_name</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
2614     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="identifier">string_type</span> <span class="identifier">name</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
2615
2616     <span class="keyword">bool</span> <span class="identifier">is_short_name</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
2617     <span class="keyword">bool</span> <span class="identifier">is_long_name</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
2618 <span class="special">};</span>
2619 </pre>
2620 </div>
2621 <div class="section">
2622 <div class="titlepage"><div><div><h5 class="title">
2623 <a name="chrono.reference.io_v1.chrono_io_hpp.manipulators"></a><a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.manipulators" title="I/O Manipulators">I/O
2624           Manipulators</a>
2625 </h5></div></div></div>
2626 <p>
2627             The short or long format can be easily chosen by streaming a <code class="computeroutput"><span class="identifier">duration_short</span></code> or <code class="computeroutput"><span class="identifier">duration_long</span></code>
2628             manipulator respectively.
2629           </p>
2630 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
2631     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2632     <span class="identifier">duration_short</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">);</span>
2633 </pre>
2634 <p>
2635             <span class="bold"><strong>Effects:</strong></span> Set the <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> facet to stream
2636             <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>s and <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>s as abbreviations.
2637           </p>
2638 <p>
2639             <span class="bold"><strong>Returns:</strong></span> the output stream
2640           </p>
2641 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
2642     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2643     <span class="identifier">duration_long</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">);</span>
2644 </pre>
2645 <p>
2646             <span class="bold"><strong>Effects:</strong></span> Set the <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> facet to stream
2647             durations and time_points as long text.
2648           </p>
2649 <p>
2650             <span class="bold"><strong>Returns:</strong></span> the output stream
2651           </p>
2652 </div>
2653 <div class="section">
2654 <div class="titlepage"><div><div><h5 class="title">
2655 <a name="chrono.reference.io_v1.chrono_io_hpp.streams"></a><a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.streams" title="I/O Streams Operations">I/O
2656           Streams Operations</a>
2657 </h5></div></div></div>
2658 <p>
2659             Any <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> can be streamed out
2660             to a <code class="computeroutput"><span class="identifier">basic_ostream</span></code>. The
2661             run-time value of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> is formatted according
2662             to the rules and current format settings for <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><code class="computeroutput"><span class="special">::</span><span class="identifier">rep</span></code>. This is followed by a single space
2663             and then the compile-time unit name of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>. This unit name is
2664             built on the string returned from <code class="computeroutput"><span class="identifier">ratio_string</span><span class="special">&lt;&gt;</span></code> and the data used to construct
2665             the <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> which was inserted
2666             into the stream's locale. If a <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> has not been
2667             inserted into the stream's locale, a default constructed <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> will be added
2668             to the stream's locale.
2669           </p>
2670 <p>
2671             A <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> is formatted by outputting
2672             its internal <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> followed by a string
2673             that describes the <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><code class="computeroutput"><span class="special">::</span><span class="identifier">clock</span></code> epoch. This string will vary
2674             for each distinct clock, and for each implementation of the supplied
2675             clocks.
2676           </p>
2677 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
2678     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2679     <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
2680 </pre>
2681 <p>
2682             <span class="bold"><strong>Effects:</strong></span> outputs the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> as an abbreviated or
2683             long text format depending on the state of the <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> facet.
2684           </p>
2685 <p>
2686             <span class="bold"><strong>Returns:</strong></span> the output stream
2687           </p>
2688 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
2689     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2690     <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span>
2691 </pre>
2692 <p>
2693             <span class="bold"><strong>Effects:</strong></span> reads a <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> from the input stream.
2694             If a format error is found, the input stream state will be set to <code class="computeroutput"><span class="identifier">failbit</span></code>.
2695           </p>
2696 <p>
2697             <span class="bold"><strong>Returns:</strong></span> the input stream
2698           </p>
2699 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
2700     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2701     <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
2702            <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
2703 </pre>
2704 <p>
2705             <span class="bold"><strong>Effects:</strong></span> outputs the <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> as an abbreviated
2706             or long text format depending on the state of the <a class="link" href="reference.html#chrono.reference.io_v1.chrono_io_hpp.duration_punct" title="Template Class duration_punct&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_punct</span></code></a> facet.
2707           </p>
2708 <p>
2709             <span class="bold"><strong>Returns:</strong></span> the output stream
2710           </p>
2711 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
2712     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
2713     <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
2714            <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
2715 </pre>
2716 <p>
2717             <span class="bold"><strong>Effects:</strong></span> reads a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> from the input stream.
2718             If a format error is found, the input stream state will be set to <code class="computeroutput"><span class="identifier">failbit</span></code>.
2719           </p>
2720 <p>
2721             <span class="bold"><strong>Returns:</strong></span> the input stream
2722           </p>
2723 </div>
2724 </div>
2725 </div>
2726 <div class="section">
2727 <div class="titlepage"><div><div><h3 class="title">
2728 <a name="chrono.reference.io"></a><a class="link" href="reference.html#chrono.reference.io" title="Chrono I/O V2">Chrono I/O V2</a>
2729 </h3></div></div></div>
2730 <div class="toc"><dl class="toc">
2731 <dt><span class="section"><a href="reference.html#chrono.reference.io.chrono_io_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2732 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_style_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_style</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2733 <dt><span class="section"><a href="reference.html#chrono.reference.io.timezone_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">timezone</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2734 <dt><span class="section"><a href="reference.html#chrono.reference.io.ios_state_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">ios_base_state</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2735 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_get_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_get</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2736 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_put_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_put</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2737 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_units_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_units</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2738 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_io_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2739 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_get_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_get</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2740 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_put_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_put</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2741 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_units_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_units</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2742 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_io_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
2743 </dl></div>
2744 <div class="section">
2745 <div class="titlepage"><div><div><h4 class="title">
2746 <a name="chrono.reference.io.chrono_io_hpp"></a><a class="link" href="reference.html#chrono.reference.io.chrono_io_hpp" title="Header &lt;boost/chrono/chrono_io.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">chrono_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2747 </h4></div></div></div>
2748 <p>
2749           This file includes the i/o of the two major components, duration and time_point.
2750         </p>
2751 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_style</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2752 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">timezone</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2753 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">ios_base_state</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2754 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_get</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2755 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_put</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2756 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_units</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2757 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2758 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_get</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2759 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_put</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2760 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_units</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2761 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
2762 </pre>
2763 </div>
2764 <div class="section">
2765 <div class="titlepage"><div><div><h4 class="title">
2766 <a name="chrono.reference.io.duration_style_hpp"></a><a class="link" href="reference.html#chrono.reference.io.duration_style_hpp" title="Header &lt;boost/chrono/io/duration_style.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_style</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2767 </h4></div></div></div>
2768 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.io.duration_style_hpp.duration_style">Scoped
2769           enum <code class="computeroutput"><span class="identifier">duration_style</span></code></a></span></dt></dl></div>
2770 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
2771   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
2772
2773     <span class="comment">// typedefs</span>
2774     <span class="keyword">enum</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a> <span class="special">{</span>
2775       <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">prefix</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">symbol</span></code></a>
2776     <span class="special">};</span>
2777   <span class="special">}</span>
2778 <span class="special">}</span>
2779 </pre>
2780 <div class="section">
2781 <div class="titlepage"><div><div><h5 class="title">
2782 <a name="chrono.reference.io.duration_style_hpp.duration_style"></a><a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style">Scoped
2783           enum <code class="computeroutput"><span class="identifier">duration_style</span></code></a>
2784 </h5></div></div></div>
2785 <pre class="programlisting"><span class="keyword">enum</span> <span class="keyword">class</span> <span class="identifier">duration_style</span> <span class="special">{</span>
2786   <span class="identifier">prefix</span><span class="special">,</span> <span class="identifier">symbol</span>
2787 <span class="special">};</span>
2788 </pre>
2789 <p>
2790             <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> unit names come in
2791             two varieties: prefix and symbol.
2792           </p>
2793 </div>
2794 </div>
2795 <div class="section">
2796 <div class="titlepage"><div><div><h4 class="title">
2797 <a name="chrono.reference.io.timezone_hpp"></a><a class="link" href="reference.html#chrono.reference.io.timezone_hpp" title="Header &lt;boost/chrono/io/timezone.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">timezone</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2798 </h4></div></div></div>
2799 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.io.timezone_hpp.timezone">Scoped
2800           enum <code class="computeroutput"><span class="identifier">timezone</span></code></a></span></dt></dl></div>
2801 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
2802   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
2803
2804     <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a>
2805     <span class="special">{</span>
2806       <span class="keyword">enum</span> <span class="identifier">type</span> <span class="special">{</span>
2807         <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">utc</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">local</span></code></a>
2808       <span class="special">};</span>
2809     <span class="special">};</span>
2810   <span class="special">}</span>
2811 <span class="special">}</span>
2812 </pre>
2813 <div class="section">
2814 <div class="titlepage"><div><div><h5 class="title">
2815 <a name="chrono.reference.io.timezone_hpp.timezone"></a><a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone">Scoped
2816           enum <code class="computeroutput"><span class="identifier">timezone</span></code></a>
2817 </h5></div></div></div>
2818 <pre class="programlisting"><span class="keyword">enum</span> <span class="keyword">class</span> <span class="identifier">timezone</span> <span class="special">{</span>
2819   <span class="identifier">utc</span><span class="special">,</span> <span class="identifier">local</span>
2820 <span class="special">};</span>
2821 </pre>
2822 </div>
2823 </div>
2824 <div class="section">
2825 <div class="titlepage"><div><div><h4 class="title">
2826 <a name="chrono.reference.io.ios_state_hpp"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp" title="Header &lt;boost/chrono/io/ios_base_state.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">ios_base_state</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
2827 </h4></div></div></div>
2828 <div class="toc"><dl class="toc">
2829 <dt><span class="section"><a href="reference.html#chrono.reference.io.ios_state_hpp.sag">Setter and
2830           getters</a></span></dt>
2831 <dt><span class="section"><a href="reference.html#chrono.reference.io.ios_state_hpp.ioss">I/O State
2832           Savers</a></span></dt>
2833 </dl></div>
2834 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
2835   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
2836
2837     <span class="comment">// setters and getters</span>
2838     <span class="identifier">duration_style</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_duration_style" title="Non Member Function get_duration_style(std::ios_base &amp;)"><code class="computeroutput"><span class="identifier">get_duration_style</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
2839     <span class="keyword">void</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_duration_style" title="Non Member Function set_duration_style(std::ios_base &amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_duration_style</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">);</span>
2840
2841     <span class="identifier">timezone</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_timezone" title="Non Member Function get_timezone(std::ios_base&amp;)"><code class="computeroutput"><span class="identifier">get_timezone</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
2842     <span class="keyword">void</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_timezone" title="Non Member Function set_timezone(std::ios_base&amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_timezone</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">timezone</span> <span class="identifier">tz</span><span class="special">);</span>
2843
2844     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2845     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_time_fmt" title="Non Member Function get_time_fmt(std::ios_base &amp;)"><code class="computeroutput"><span class="identifier">get_time_fmt</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
2846     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2847     <span class="keyword">void</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_time_fmt" title="Non Member Function set_time_fmt(std::ios_base&amp;, std::basic_string&lt;CharT&gt; const&amp;)"><code class="computeroutput"><span class="identifier">set_time_fmt</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">fmt</span><span class="special">);</span>
2848
2849     <span class="comment">// i/o state savers</span>
2850     <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver" title="Template Class duration_style_io_saver"><code class="computeroutput"><span class="identifier">duration_style_io_saver</span></code></a><span class="special">;</span>
2851     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Traits</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
2852     <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver" title="Template Class timezone_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a><span class="special">;</span>
2853     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Traits</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
2854     <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver" title="Template Class time_fmt_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">time_fmt_io_saver</span></code></a><span class="special">;</span>
2855   <span class="special">}</span>
2856 <span class="special">}</span>
2857 </pre>
2858 <div class="section">
2859 <div class="titlepage"><div><div><h5 class="title">
2860 <a name="chrono.reference.io.ios_state_hpp.sag"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag" title="Setter and getters">Setter and
2861           getters</a>
2862 </h5></div></div></div>
2863 <div class="section">
2864 <div class="titlepage"><div><div><h6 class="title">
2865 <a name="chrono.reference.io.ios_state_hpp.sag.get_duration_style"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_duration_style" title="Non Member Function get_duration_style(std::ios_base &amp;)">Non
2866             Member Function <code class="computeroutput"><span class="identifier">get_duration_style</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span>
2867             <span class="special">&amp;)</span></code></a>
2868 </h6></div></div></div>
2869 <pre class="programlisting"><span class="identifier">duration_style</span> <span class="identifier">get_duration_style</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
2870 </pre>
2871 <p>
2872               <span class="bold"><strong>Returns:</strong></span> The stream's <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a> attribute associated
2873               to <code class="computeroutput"><span class="identifier">ios</span></code>.
2874             </p>
2875 </div>
2876 <div class="section">
2877 <div class="titlepage"><div><div><h6 class="title">
2878 <a name="chrono.reference.io.ios_state_hpp.sag.set_duration_style"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_duration_style" title="Non Member Function set_duration_style(std::ios_base &amp;,duration_style)">Non
2879             Member Function <code class="computeroutput"><span class="identifier">set_duration_style</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span>
2880             <span class="special">&amp;,</span><span class="identifier">duration_style</span><span class="special">)</span></code></a>
2881 </h6></div></div></div>
2882 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">set_duration_style</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">);</span>
2883 </pre>
2884 <p>
2885               <span class="bold"><strong>Effects:</strong></span> Set the stream's <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a> attribute associated
2886               to <code class="computeroutput"><span class="identifier">ios</span></code> with the <code class="computeroutput"><span class="identifier">style</span></code> parameter.
2887             </p>
2888 </div>
2889 <div class="section">
2890 <div class="titlepage"><div><div><h6 class="title">
2891 <a name="chrono.reference.io.ios_state_hpp.sag.get_timezone"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_timezone" title="Non Member Function get_timezone(std::ios_base&amp;)">Non
2892             Member Function <code class="computeroutput"><span class="identifier">get_timezone</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;)</span></code></a>
2893 </h6></div></div></div>
2894 <pre class="programlisting"><span class="identifier">timezone</span> <span class="identifier">get_timezone</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
2895 </pre>
2896 <p>
2897               <span class="bold"><strong>Returns:</strong></span> The stream's <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> attribute associated
2898               to <code class="computeroutput"><span class="identifier">ios</span></code>.
2899             </p>
2900 </div>
2901 <div class="section">
2902 <div class="titlepage"><div><div><h6 class="title">
2903 <a name="chrono.reference.io.ios_state_hpp.sag.set_timezone"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_timezone" title="Non Member Function set_timezone(std::ios_base&amp;,duration_style)">Non
2904             Member Function <code class="computeroutput"><span class="identifier">set_timezone</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">duration_style</span><span class="special">)</span></code></a>
2905 </h6></div></div></div>
2906 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">set_timezone</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">timezone</span> <span class="identifier">tz</span><span class="special">);</span>
2907 </pre>
2908 <p>
2909               <span class="bold"><strong>Effects:</strong></span> Set the stream's <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> attribute associated
2910               to <code class="computeroutput"><span class="identifier">ios</span></code> with the <code class="computeroutput"><span class="identifier">tz</span></code> parameter.
2911             </p>
2912 </div>
2913 <div class="section">
2914 <div class="titlepage"><div><div><h6 class="title">
2915 <a name="chrono.reference.io.ios_state_hpp.sag.get_time_fmt"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_time_fmt" title="Non Member Function get_time_fmt(std::ios_base &amp;)">Non
2916             Member Function <code class="computeroutput"><span class="identifier">get_time_fmt</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span>
2917             <span class="special">&amp;)</span></code></a>
2918 </h6></div></div></div>
2919 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2920 <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">get_time_fmt</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
2921 </pre>
2922 <p>
2923               <span class="bold"><strong>Returns:</strong></span> The stream's time format
2924               attribute associated to <code class="computeroutput"><span class="identifier">ios</span></code>.
2925             </p>
2926 </div>
2927 <div class="section">
2928 <div class="titlepage"><div><div><h6 class="title">
2929 <a name="chrono.reference.io.ios_state_hpp.sag.set_time_fmt"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_time_fmt" title="Non Member Function set_time_fmt(std::ios_base&amp;, std::basic_string&lt;CharT&gt; const&amp;)">Non
2930             Member Function <code class="computeroutput"><span class="identifier">set_time_fmt</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;)</span></code></a>
2931 </h6></div></div></div>
2932 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
2933 <span class="keyword">void</span> <span class="identifier">set_time_fmt</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">fmt</span><span class="special">);</span>
2934 </pre>
2935 <p>
2936               <span class="bold"><strong>Effects:</strong></span> Set the stream's time format
2937               attribute associated to <code class="computeroutput"><span class="identifier">ios</span></code>
2938               with the <code class="computeroutput"><span class="identifier">fmt</span></code> parameter.
2939             </p>
2940 <p>
2941               The format is composed of zero or more directives. Each directive is
2942               composed of one of the following:
2943             </p>
2944 <pre class="programlisting"><span class="special">*</span> <span class="identifier">one</span> <span class="keyword">or</span> <span class="identifier">more</span> <span class="identifier">white</span><span class="special">-</span><span class="identifier">space</span> <span class="identifier">characters</span> <span class="special">(</span><span class="identifier">as</span> <span class="identifier">specified</span> <span class="identifier">by</span> <span class="identifier">isspace</span><span class="special">());</span>
2945 <span class="special">*</span> <span class="identifier">an</span> <span class="identifier">ordinary</span> <span class="identifier">character</span> <span class="special">(</span><span class="identifier">neither</span> <span class="char">'%'</span> <span class="identifier">nor</span> <span class="identifier">a</span> <span class="identifier">white</span><span class="special">-</span><span class="identifier">space</span> <span class="identifier">character</span><span class="special">);</span>
2946 <span class="special">*</span> <span class="keyword">or</span> <span class="identifier">a</span> <span class="identifier">conversion</span> <span class="identifier">specification</span><span class="special">.</span>
2947 </pre>
2948 <p>
2949               Each conversion specification is composed of a '%' character followed
2950               by a conversion character which specifies the replacement required.
2951               The application shall ensure that there is white-space or other non-alphanumeric
2952               characters between any two conversion specifications. The following
2953               conversion specifications are supported:
2954             </p>
2955 <div class="table">
2956 <a name="chrono.reference.io.ios_state_hpp.sag.set_time_fmt.format_tags"></a><p class="title"><b>Table&#160;8.3.&#160;Format tags</b></p>
2957 <div class="table-contents"><table class="table" summary="Format tags">
2958 <colgroup>
2959 <col>
2960 <col>
2961 <col>
2962 </colgroup>
2963 <thead><tr>
2964 <th>
2965                       <p>
2966                         Format Specifier
2967                       </p>
2968                     </th>
2969 <th>
2970                       <p>
2971                         Description
2972                       </p>
2973                     </th>
2974 <th>
2975                       <p>
2976                         Example
2977                       </p>
2978                     </th>
2979 </tr></thead>
2980 <tbody>
2981 <tr>
2982 <td>
2983                       <p>
2984                         <code class="computeroutput"><span class="special">%%</span></code>
2985                       </p>
2986                     </td>
2987 <td>
2988                       <p>
2989                         Replaced by <code class="computeroutput"><span class="special">%</span></code>.
2990                       </p>
2991                     </td>
2992 <td>
2993                       <p>
2994                         .
2995                       </p>
2996                     </td>
2997 </tr>
2998 <tr>
2999 <td>
3000                       <p>
3001                         <code class="computeroutput"><span class="special">%</span><span class="identifier">a</span>
3002                         <span class="special">%</span><span class="identifier">A</span></code>
3003                       </p>
3004                     </td>
3005 <td>
3006                       <p>
3007                         The day of the week, using the locale's weekday names; either
3008                         the abbreviated or full name may be specified.
3009                       </p>
3010                     </td>
3011 <td>
3012                       <p>
3013                         "Monday".
3014                       </p>
3015                     </td>
3016 </tr>
3017 <tr>
3018 <td>
3019                       <p>
3020                         <code class="computeroutput"><span class="special">%</span><span class="identifier">b</span>
3021                         <span class="special">%</span><span class="identifier">B</span>
3022                         <span class="special">%</span><span class="identifier">h</span></code>
3023                       </p>
3024                     </td>
3025 <td>
3026                       <p>
3027                         The month, using the locale's month names; either the abbreviated
3028                         or full name may be specified.
3029                       </p>
3030                     </td>
3031 <td>
3032                       <p>
3033                         "February".
3034                       </p>
3035                     </td>
3036 </tr>
3037 <tr>
3038 <td>
3039                       <p>
3040                         <code class="computeroutput"><span class="special">%</span><span class="identifier">c</span></code>
3041                       </p>
3042                     </td>
3043 <td>
3044                       <p>
3045                         Not supported.
3046                       </p>
3047                     </td>
3048 <td>
3049                       <p>
3050                         .
3051                       </p>
3052                     </td>
3053 </tr>
3054 <tr>
3055 <td>
3056                       <p>
3057                         <code class="computeroutput"><span class="special">%</span><span class="identifier">d</span>
3058                         <span class="special">%</span><span class="identifier">e</span></code>
3059                       </p>
3060                     </td>
3061 <td>
3062                       <p>
3063                         The day of the month <code class="computeroutput"><span class="special">[</span><span class="number">01</span><span class="special">,</span><span class="number">31</span><span class="special">]</span></code>;
3064                         leading zeros are permitted but not required..
3065                       </p>
3066                     </td>
3067 <td>
3068                       <p>
3069                         .
3070                       </p>
3071                     </td>
3072 </tr>
3073 <tr>
3074 <td>
3075                       <p>
3076                         <code class="computeroutput"><span class="special">%</span><span class="identifier">D</span></code>
3077                       </p>
3078                     </td>
3079 <td>
3080                       <p>
3081                         The date as <code class="computeroutput"><span class="special">%</span><span class="identifier">m</span><span class="special">/%</span><span class="identifier">d</span><span class="special">/%</span><span class="identifier">y</span></code>.
3082                       </p>
3083                     </td>
3084 <td>
3085                       <p>
3086                         .
3087                       </p>
3088                     </td>
3089 </tr>
3090 <tr>
3091 <td>
3092                       <p>
3093                         <code class="computeroutput"><span class="special">%</span><span class="identifier">F</span></code>
3094                       </p>
3095                     </td>
3096 <td>
3097                       <p>
3098                         The date as <code class="computeroutput"><span class="special">%</span><span class="identifier">Y</span><span class="special">/%</span><span class="identifier">m</span><span class="special">/%</span><span class="identifier">d</span></code>.
3099                       </p>
3100                     </td>
3101 <td>
3102                       <p>
3103                         .
3104                       </p>
3105                     </td>
3106 </tr>
3107 <tr>
3108 <td>
3109                       <p>
3110                         <code class="computeroutput"><span class="special">%</span><span class="identifier">H</span></code>
3111                       </p>
3112                     </td>
3113 <td>
3114                       <p>
3115                         The hour (24-hour clock) <code class="computeroutput"><span class="special">[</span><span class="number">00</span><span class="special">,</span><span class="number">23</span><span class="special">]</span></code>;
3116                         leading zeros are permitted but not required.
3117                       </p>
3118                     </td>
3119 <td>
3120                       <p>
3121                         .
3122                       </p>
3123                     </td>
3124 </tr>
3125 <tr>
3126 <td>
3127                       <p>
3128                         <code class="computeroutput"><span class="special">%</span><span class="identifier">I</span></code>
3129                       </p>
3130                     </td>
3131 <td>
3132                       <p>
3133                         The hour (12-hour clock) <code class="computeroutput"><span class="special">[</span><span class="number">01</span><span class="special">,</span><span class="number">12</span><span class="special">]</span></code>;
3134                         leading zeros are permitted but not required.
3135                       </p>
3136                     </td>
3137 <td>
3138                       <p>
3139                         .
3140                       </p>
3141                     </td>
3142 </tr>
3143 <tr>
3144 <td>
3145                       <p>
3146                         <code class="computeroutput"><span class="special">%</span><span class="identifier">j</span></code>
3147                       </p>
3148                     </td>
3149 <td>
3150                       <p>
3151                         The day number of the year <code class="computeroutput"><span class="special">[</span><span class="number">001</span><span class="special">,</span><span class="number">366</span><span class="special">]</span></code>;
3152                         leading zeros are permitted but not required.
3153                       </p>
3154                     </td>
3155 <td>
3156                       <p>
3157                         "060" =&gt; Feb-29.
3158                       </p>
3159                     </td>
3160 </tr>
3161 <tr>
3162 <td>
3163                       <p>
3164                         <code class="computeroutput"><span class="special">%</span><span class="identifier">m</span></code>
3165                       </p>
3166                     </td>
3167 <td>
3168                       <p>
3169                         The month number <code class="computeroutput"><span class="special">[</span><span class="number">01</span><span class="special">,</span><span class="number">12</span><span class="special">]</span></code>;
3170                         leading zeros are permitted but not required..
3171                       </p>
3172                     </td>
3173 <td>
3174                       <p>
3175                         "01" =&gt; January.
3176                       </p>
3177                     </td>
3178 </tr>
3179 <tr>
3180 <td>
3181                       <p>
3182                         <code class="computeroutput"><span class="special">%</span><span class="identifier">M</span></code>
3183                       </p>
3184                     </td>
3185 <td>
3186                       <p>
3187                         The minute <code class="computeroutput"><span class="special">[</span><span class="number">00</span><span class="special">,</span><span class="number">59</span><span class="special">]</span></code>;
3188                         leading zeros are permitted but not required.
3189                       </p>
3190                     </td>
3191 <td>
3192                       <p>
3193                         .
3194                       </p>
3195                     </td>
3196 </tr>
3197 <tr>
3198 <td>
3199                       <p>
3200                         <code class="computeroutput"><span class="special">%</span><span class="identifier">n</span>
3201                         <span class="special">%</span><span class="identifier">t</span></code>
3202                       </p>
3203                     </td>
3204 <td>
3205                       <p>
3206                         Any white space..
3207                       </p>
3208                     </td>
3209 <td>
3210                       <p>
3211                         .
3212                       </p>
3213                     </td>
3214 </tr>
3215 <tr>
3216 <td>
3217                       <p>
3218                         <code class="computeroutput"><span class="special">%</span><span class="identifier">p</span></code>
3219                       </p>
3220                     </td>
3221 <td>
3222                       <p>
3223                         Not supported.
3224                       </p>
3225                     </td>
3226 <td>
3227                       <p>
3228                         .
3229                       </p>
3230                     </td>
3231 </tr>
3232 <tr>
3233 <td>
3234                       <p>
3235                         <code class="computeroutput"><span class="special">%</span><span class="identifier">r</span></code>
3236                       </p>
3237                     </td>
3238 <td>
3239                       <p>
3240                         Not supported.
3241                       </p>
3242                     </td>
3243 <td>
3244                       <p>
3245                         .
3246                       </p>
3247                     </td>
3248 </tr>
3249 <tr>
3250 <td>
3251                       <p>
3252                         <code class="computeroutput"><span class="special">%</span><span class="identifier">R</span></code>
3253                       </p>
3254                     </td>
3255 <td>
3256                       <p>
3257                         The time as <code class="computeroutput"><span class="special">%</span><span class="identifier">H</span><span class="special">:%</span><span class="identifier">M</span></code>.
3258                       </p>
3259                     </td>
3260 <td>
3261                       <p>
3262                         .
3263                       </p>
3264                     </td>
3265 </tr>
3266 <tr>
3267 <td>
3268                       <p>
3269                         <code class="computeroutput"><span class="special">%</span><span class="identifier">S</span></code>
3270                       </p>
3271                     </td>
3272 <td>
3273                       <p>
3274                         The seconds <code class="computeroutput"><span class="special">[</span><span class="number">00</span><span class="special">,</span><span class="number">60</span><span class="special">]</span></code>;
3275                         leading zeros are permitted but not required.
3276                       </p>
3277                     </td>
3278 <td>
3279                       <p>
3280                         .
3281                       </p>
3282                     </td>
3283 </tr>
3284 <tr>
3285 <td>
3286                       <p>
3287                         <code class="computeroutput"><span class="special">%</span><span class="identifier">T</span></code>
3288                       </p>
3289                     </td>
3290 <td>
3291                       <p>
3292                         The time as <code class="computeroutput"><span class="special">%</span><span class="identifier">H</span><span class="special">:%</span><span class="identifier">M</span><span class="special">:%</span><span class="identifier">S</span></code>.
3293                       </p>
3294                     </td>
3295 <td>
3296                       <p>
3297                         .
3298                       </p>
3299                     </td>
3300 </tr>
3301 <tr>
3302 <td>
3303                       <p>
3304                         <code class="computeroutput"><span class="special">%</span><span class="identifier">U</span></code>
3305                       </p>
3306                     </td>
3307 <td>
3308                       <p>
3309                         Not supported.
3310                       </p>
3311                     </td>
3312 <td>
3313                       <p>
3314                         .
3315                       </p>
3316                     </td>
3317 </tr>
3318 <tr>
3319 <td>
3320                       <p>
3321                         <code class="computeroutput"><span class="special">%</span><span class="identifier">w</span></code>
3322                       </p>
3323                     </td>
3324 <td>
3325                       <p>
3326                         The weekday as a decimal number <code class="computeroutput"><span class="special">[</span><span class="number">0</span><span class="special">,</span><span class="number">6</span><span class="special">]</span></code>,
3327                         with 0 representing Sunday; leading zeros are permitted but
3328                         not required..
3329                       </p>
3330                     </td>
3331 <td>
3332                       <p>
3333                         "0" =&gt; Sunday.
3334                       </p>
3335                     </td>
3336 </tr>
3337 <tr>
3338 <td>
3339                       <p>
3340                         <code class="computeroutput"><span class="special">%</span><span class="identifier">W</span></code>
3341                       </p>
3342                     </td>
3343 <td>
3344                       <p>
3345                         Not supported.
3346                       </p>
3347                     </td>
3348 <td>
3349                       <p>
3350                         .
3351                       </p>
3352                     </td>
3353 </tr>
3354 <tr>
3355 <td>
3356                       <p>
3357                         <code class="computeroutput"><span class="special">%</span><span class="identifier">x</span></code>
3358                       </p>
3359                     </td>
3360 <td>
3361                       <p>
3362                         The date, using the locale's date format..
3363                       </p>
3364                     </td>
3365 <td>
3366                       <p>
3367                         .
3368                       </p>
3369                     </td>
3370 </tr>
3371 <tr>
3372 <td>
3373                       <p>
3374                         <code class="computeroutput"><span class="special">%</span><span class="identifier">X</span></code>
3375                       </p>
3376                     </td>
3377 <td>
3378                       <p>
3379                         Not supported.
3380                       </p>
3381                     </td>
3382 <td>
3383                       <p>
3384                         .
3385                       </p>
3386                     </td>
3387 </tr>
3388 <tr>
3389 <td>
3390                       <p>
3391                         <code class="computeroutput"><span class="special">%</span><span class="identifier">y</span></code>
3392                       </p>
3393                     </td>
3394 <td>
3395                       <p>
3396                         Not supported.
3397                       </p>
3398                     </td>
3399 <td>
3400                       <p>
3401                         "2005".
3402                       </p>
3403                     </td>
3404 </tr>
3405 <tr>
3406 <td>
3407                       <p>
3408                         <code class="computeroutput"><span class="special">%</span><span class="identifier">Y</span></code>
3409                       </p>
3410                     </td>
3411 <td>
3412                       <p>
3413                         The year, including the century (for example, 1988).
3414                       </p>
3415                     </td>
3416 <td>
3417                       <p>
3418                         .
3419                       </p>
3420                     </td>
3421 </tr>
3422 </tbody>
3423 </table></div>
3424 </div>
3425 <br class="table-break">
3426 </div>
3427 </div>
3428 <div class="section">
3429 <div class="titlepage"><div><div><h5 class="title">
3430 <a name="chrono.reference.io.ios_state_hpp.ioss"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss" title="I/O State Savers">I/O State
3431           Savers</a>
3432 </h5></div></div></div>
3433 <div class="section">
3434 <div class="titlepage"><div><div><h6 class="title">
3435 <a name="chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver" title="Template Class duration_style_io_saver">Template
3436             Class <code class="computeroutput"><span class="identifier">duration_style_io_saver</span></code></a>
3437 </h6></div></div></div>
3438 <pre class="programlisting"><span class="comment">// i/o state savers</span>
3439
3440 <span class="keyword">struct</span> <span class="identifier">duration_style_io_saver</span>
3441 <span class="special">{</span>
3442   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="identifier">state_type</span><span class="special">;</span> <span class="comment">// the state type is ios_base</span>
3443   <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a> <span class="identifier">aspect_type</span><span class="special">;</span> <span class="comment">// the aspect type is the __duration_style</span>
3444
3445   <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.c1" title="Constructor duration_style_io_saver(state_type&amp;)"><code class="computeroutput"><span class="identifier">duration_style_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
3446   <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.c2" title="Constructor duration_style_io_saver(state_type&amp;, aspect_type)"><code class="computeroutput"><span class="identifier">duration_style_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">aspect_type</span> <span class="identifier">new_value</span><span class="special">);</span>
3447   <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.d" title="Destructor ~duration_style_io_saver()"><code class="computeroutput"><span class="special">~</span><span class="identifier">duration_style_io_saver</span></code></a><span class="special">();</span>
3448   <span class="keyword">void</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.restore" title="Member Function restore()"><code class="computeroutput"><span class="identifier">restore</span></code></a><span class="special">();</span>
3449 <span class="special">};</span>
3450 </pre>
3451 <p>
3452               The <code class="computeroutput"><span class="identifier">state_type</span></code> is a
3453               version of the IOStreams base class <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span></code>.
3454             </p>
3455 <div class="section">
3456 <div class="titlepage"><div><div><h6 class="title">
3457 <a name="chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.c1"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.c1" title="Constructor duration_style_io_saver(state_type&amp;)">Constructor
3458               <code class="computeroutput"><span class="identifier">duration_style_io_saver</span><span class="special">(</span><span class="identifier">state_type</span><span class="special">&amp;)</span></code></a>
3459 </h6></div></div></div>
3460 <p>
3461                 This constructor takes a stream object and saves a reference to the
3462                 stream and the current value of a particular stream attribute.
3463               </p>
3464 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">duration_style_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
3465 </pre>
3466 <p>
3467                 <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver" title="Template Class duration_style_io_saver"><code class="computeroutput"><span class="identifier">duration_style_io_saver</span></code></a>
3468                 by storing <code class="computeroutput"><span class="identifier">s</span></code>.
3469               </p>
3470 </div>
3471 <div class="section">
3472 <div class="titlepage"><div><div><h6 class="title">
3473 <a name="chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.c2"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.c2" title="Constructor duration_style_io_saver(state_type&amp;, aspect_type)">Constructor
3474               <code class="computeroutput"><span class="identifier">duration_style_io_saver</span><span class="special">(</span><span class="identifier">state_type</span><span class="special">&amp;,</span> <span class="identifier">aspect_type</span><span class="special">)</span></code></a>
3475 </h6></div></div></div>
3476 <p>
3477                 This constructor works like the previous one, and in addition uses
3478                 its second argument to change the stream's attribute to the new
3479                 <code class="computeroutput"><span class="identifier">aspect_type</span></code> value
3480                 given.
3481               </p>
3482 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">duration_style_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">aspect_type</span> <span class="identifier">new_value</span><span class="special">);</span>
3483 </pre>
3484 <p>
3485                 <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver" title="Template Class duration_style_io_saver"><code class="computeroutput"><span class="identifier">duration_style_io_saver</span></code></a>
3486                 by storing <code class="computeroutput"><span class="identifier">s</span></code>. Sets
3487                 the <code class="computeroutput"><span class="identifier">state_type</span></code> <code class="computeroutput"><span class="identifier">aspect_type</span></code> with the value <code class="computeroutput"><span class="identifier">new_value</span></code>.
3488               </p>
3489 </div>
3490 <div class="section">
3491 <div class="titlepage"><div><div><h6 class="title">
3492 <a name="chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.d"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.d" title="Destructor ~duration_style_io_saver()">Destructor
3493               <code class="computeroutput"><span class="special">~</span><span class="identifier">duration_style_io_saver</span><span class="special">()</span></code></a>
3494 </h6></div></div></div>
3495 <p>
3496                 The destructor restores the stream's attribute to the saved value.
3497               </p>
3498 <pre class="programlisting"><span class="special">~</span><span class="identifier">duration_style_io_saver</span><span class="special">();</span>
3499 </pre>
3500 <p>
3501                 <span class="bold"><strong>Effects:</strong></span> As if <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.restore" title="Member Function restore()"><code class="computeroutput"><span class="identifier">restore</span></code></a>().
3502               </p>
3503 </div>
3504 <div class="section">
3505 <div class="titlepage"><div><div><h6 class="title">
3506 <a name="chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.restore"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.duration_style_io_saver.restore" title="Member Function restore()">Member
3507               Function <code class="computeroutput"><span class="identifier">restore</span><span class="special">()</span></code></a>
3508 </h6></div></div></div>
3509 <p>
3510                 The restoration can be activated early (and often) with the restore
3511                 member function.
3512               </p>
3513 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">restore</span><span class="special">();</span>
3514 </pre>
3515 <p>
3516                 <span class="bold"><strong>Effects:</strong></span> Restores the stream's
3517                 <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a> attribute
3518                 to the saved value.
3519               </p>
3520 </div>
3521 </div>
3522 <div class="section">
3523 <div class="titlepage"><div><div><h6 class="title">
3524 <a name="chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver" title="Template Class timezone_io_saver&lt;&gt;">Template
3525             Class <code class="computeroutput"><span class="identifier">timezone_io_saver</span><span class="special">&lt;&gt;</span></code></a>
3526 </h6></div></div></div>
3527 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Traits</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
3528 <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver" title="Template Class timezone_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a>
3529 <span class="special">{</span>
3530   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ios</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span> <span class="identifier">state_type</span><span class="special">;</span>
3531   <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> <span class="identifier">aspect_type</span><span class="special">;</span>
3532
3533   <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c1" title="Constructor timezone_io_saver(state_type&amp;)"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
3534   <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c2" title="Constructor timezone_io_saver(state_type&amp;, aspect_type)"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">aspect_type</span> <span class="identifier">new_value</span><span class="special">);</span>
3535   <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.d" title="Destructor ~timezone_io_saver()"><code class="computeroutput"><span class="special">~</span><span class="identifier">timezone_io_saver</span></code></a><span class="special">();</span>
3536   <span class="keyword">void</span> <span class="identifier">timezone_io_saver__restore</span><span class="special">();</span>
3537 <span class="special">};</span>
3538 </pre>
3539 <p>
3540               The <code class="computeroutput"><span class="identifier">state_type</span></code> is a
3541               version of the IOStreams base class template <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ios</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code>, where <code class="computeroutput"><span class="identifier">CharT</span></code>
3542               is a character type and <code class="computeroutput"><span class="identifier">Traits</span></code>
3543               is a character traits class. The user would usually place an actual
3544               input, output, or combined stream object for the state-type parameter,
3545               and not a base class object.
3546             </p>
3547 <div class="section">
3548 <div class="titlepage"><div><div><h6 class="title">
3549 <a name="chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c1"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c1" title="Constructor timezone_io_saver(state_type&amp;)">Constructor
3550               <code class="computeroutput"><span class="identifier">timezone_io_saver</span><span class="special">(</span><span class="identifier">state_type</span><span class="special">&amp;)</span></code></a>
3551 </h6></div></div></div>
3552 <p>
3553                 This constructor takes a stream object and saves a reference to the
3554                 stream and the current value of a particular stream attribute.
3555               </p>
3556 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">timezone_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
3557 </pre>
3558 <p>
3559                 <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver" title="Template Class timezone_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a> by storing
3560                 <code class="computeroutput"><span class="identifier">s</span></code>.
3561               </p>
3562 </div>
3563 <div class="section">
3564 <div class="titlepage"><div><div><h6 class="title">
3565 <a name="chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c2"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c2" title="Constructor timezone_io_saver(state_type&amp;, aspect_type)">Constructor
3566               <code class="computeroutput"><span class="identifier">timezone_io_saver</span><span class="special">(</span><span class="identifier">state_type</span><span class="special">&amp;,</span>
3567               <span class="identifier">aspect_type</span><span class="special">)</span></code></a>
3568 </h6></div></div></div>
3569 <p>
3570                 This constructor works like the previous one, and uses its second
3571                 argument to change the stream's attribute to the new aspect_type
3572                 value given.
3573               </p>
3574 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">timezone_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">aspect_type</span> <span class="identifier">new_value</span><span class="special">);</span>
3575 </pre>
3576 <p>
3577                 <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver" title="Template Class timezone_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a> by storing
3578                 <code class="computeroutput"><span class="identifier">s</span></code>. Sets the <code class="computeroutput"><span class="identifier">state_type</span></code> <code class="computeroutput"><span class="identifier">aspect_type</span></code>
3579                 with the value <code class="computeroutput"><span class="identifier">new_value</span></code>.
3580               </p>
3581 </div>
3582 <div class="section">
3583 <div class="titlepage"><div><div><h6 class="title">
3584 <a name="chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.d"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.d" title="Destructor ~timezone_io_saver()">Destructor
3585               <code class="computeroutput"><span class="special">~</span><span class="identifier">timezone_io_saver</span><span class="special">()</span></code></a>
3586 </h6></div></div></div>
3587 <p>
3588                 The destructor restores the stream's attribute to the saved value.
3589               </p>
3590 <pre class="programlisting"><span class="special">~</span><span class="identifier">timezone_io_saver</span><span class="special">();</span>
3591 </pre>
3592 <p>
3593                 <span class="bold"><strong>Effects:</strong></span> As if <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.restore" title="Member Function restore()"><code class="computeroutput"><span class="identifier">restore</span></code></a>().
3594               </p>
3595 </div>
3596 <div class="section">
3597 <div class="titlepage"><div><div><h6 class="title">
3598 <a name="chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.restore"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.restore" title="Member Function restore()">Member
3599               Function <code class="computeroutput"><span class="identifier">restore</span><span class="special">()</span></code></a>
3600 </h6></div></div></div>
3601 <p>
3602                 The restoration can be activated early (and often) with the restore
3603                 member function.
3604               </p>
3605 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">restore</span><span class="special">();</span>
3606 </pre>
3607 <p>
3608                 <span class="bold"><strong>Effects:</strong></span> Restores the stream's
3609                 <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> attribute to the
3610                 saved value.
3611               </p>
3612 </div>
3613 </div>
3614 <div class="section">
3615 <div class="titlepage"><div><div><h6 class="title">
3616 <a name="chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver" title="Template Class time_fmt_io_saver&lt;&gt;">Template
3617             Class <code class="computeroutput"><span class="identifier">time_fmt_io_saver</span><span class="special">&lt;&gt;</span></code></a>
3618 </h6></div></div></div>
3619 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Traits</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
3620 <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver" title="Template Class time_fmt_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">time_fmt_io_saver</span></code></a>
3621 <span class="special">{</span>
3622   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ios</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span> <span class="identifier">state_type</span><span class="special">;</span>
3623
3624   <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.c1" title="Constructor time_fmt_io_saver(state_type&amp;)"><code class="computeroutput"><span class="identifier">time_fmt_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
3625   <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.c2" title="Constructor time_fmt_io_saver(state_type&amp;, aspect_type)"><code class="computeroutput"><span class="identifier">time_fmt_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">new_value</span><span class="special">);</span>
3626   <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.d" title="Destructor ~time_fmt_io_saver()"><code class="computeroutput"><span class="special">~</span><span class="identifier">time_fmt_io_saver</span></code></a><span class="special">();</span>
3627   <span class="keyword">void</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.restore" title="Member Function restore()"><code class="computeroutput"><span class="identifier">restore</span></code></a><span class="special">();</span>
3628 <span class="special">};</span>
3629 </pre>
3630 <p>
3631               The <code class="computeroutput"><span class="identifier">state_type</span></code> is a
3632               version of the IOStreams base class template <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ios</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code>, where <code class="computeroutput"><span class="identifier">CharT</span></code>
3633               is a character type and <code class="computeroutput"><span class="identifier">Traits</span></code>
3634               is a character traits class. The user would usually place an actual
3635               input, output, or combined stream object for the state-type parameter,
3636               and not a base class object.
3637             </p>
3638 <div class="section">
3639 <div class="titlepage"><div><div><h6 class="title">
3640 <a name="chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.c1"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.c1" title="Constructor time_fmt_io_saver(state_type&amp;)">Constructor
3641               <code class="computeroutput"><span class="identifier">time_fmt_io_saver</span><span class="special">(</span><span class="identifier">state_type</span><span class="special">&amp;)</span></code></a>
3642 </h6></div></div></div>
3643 <p>
3644                 This constructor takes a stream object and saves a reference to the
3645                 stream and the current value of a particular stream attribute.
3646               </p>
3647 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">time_fmt_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
3648 </pre>
3649 <p>
3650                 <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver" title="Template Class time_fmt_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">time_fmt_io_saver</span></code></a> by storing
3651                 <code class="computeroutput"><span class="identifier">s</span></code>.
3652               </p>
3653 </div>
3654 <div class="section">
3655 <div class="titlepage"><div><div><h6 class="title">
3656 <a name="chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.c2"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.c2" title="Constructor time_fmt_io_saver(state_type&amp;, aspect_type)">Constructor
3657               <code class="computeroutput"><span class="identifier">time_fmt_io_saver</span><span class="special">(</span><span class="identifier">state_type</span><span class="special">&amp;,</span>
3658               <span class="identifier">aspect_type</span><span class="special">)</span></code></a>
3659 </h6></div></div></div>
3660 <p>
3661                 This constructor works like the previous one, and uses its second
3662                 argument to change the stream's attribute to the new aspect_type
3663                 value given.
3664               </p>
3665 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">time_fmt_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">aspect_type</span> <span class="identifier">new_value</span><span class="special">);</span>
3666 </pre>
3667 <p>
3668                 <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver" title="Template Class time_fmt_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">time_fmt_io_saver</span></code></a> by storing
3669                 <code class="computeroutput"><span class="identifier">s</span></code>. Sets the <code class="computeroutput"><span class="identifier">state_type</span></code> <code class="computeroutput"><span class="identifier">aspect_type</span></code>
3670                 with the value <code class="computeroutput"><span class="identifier">new_value</span></code>.
3671               </p>
3672 </div>
3673 <div class="section">
3674 <div class="titlepage"><div><div><h6 class="title">
3675 <a name="chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.d"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.d" title="Destructor ~time_fmt_io_saver()">Destructor
3676               <code class="computeroutput"><span class="special">~</span><span class="identifier">time_fmt_io_saver</span><span class="special">()</span></code></a>
3677 </h6></div></div></div>
3678 <p>
3679                 The destructor restores the stream's attribute to the saved value.
3680               </p>
3681 <pre class="programlisting"><span class="special">~</span><span class="identifier">time_fmt_io_saver</span><span class="special">();</span>
3682 </pre>
3683 <p>
3684                 <span class="bold"><strong>Effects:</strong></span> As if <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.restore" title="Member Function restore()"><code class="computeroutput"><span class="identifier">restore</span></code></a>().
3685               </p>
3686 </div>
3687 <div class="section">
3688 <div class="titlepage"><div><div><h6 class="title">
3689 <a name="chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.restore"></a><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver.restore" title="Member Function restore()">Member
3690               Function <code class="computeroutput"><span class="identifier">restore</span><span class="special">()</span></code></a>
3691 </h6></div></div></div>
3692 <p>
3693                 The restoration can be activated early (and often) with the restore
3694                 member function.
3695               </p>
3696 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">restore</span><span class="special">();</span>
3697 </pre>
3698 <p>
3699                 <span class="bold"><strong>Effects:</strong></span> Restores the stream's time
3700                 format attribute to the saved value.
3701               </p>
3702 </div>
3703 </div>
3704 </div>
3705 </div>
3706 <div class="section">
3707 <div class="titlepage"><div><div><h4 class="title">
3708 <a name="chrono.reference.io.duration_get_hpp"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp" title="Header &lt;boost/chrono/io/duration_get.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_get</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
3709 </h4></div></div></div>
3710 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.io.duration_get_hpp.duration_get">Template
3711           Class <code class="computeroutput"><span class="identifier">duration_get</span></code></a></span></dt></dl></div>
3712 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
3713   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
3714
3715     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">InputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
3716     <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get"><code class="computeroutput"><span class="identifier">duration_get</span></code></a><span class="special">;</span>
3717
3718   <span class="special">}</span>
3719 <span class="special">}</span>
3720 </pre>
3721 <div class="section">
3722 <div class="titlepage"><div><div><h5 class="title">
3723 <a name="chrono.reference.io.duration_get_hpp.duration_get"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get">Template
3724           Class <code class="computeroutput"><span class="identifier">duration_get</span></code></a>
3725 </h5></div></div></div>
3726 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">InputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
3727 <span class="keyword">class</span> <span class="identifier">duration_get</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">facet</span>
3728 <span class="special">{</span>
3729 <span class="keyword">public</span><span class="special">:</span>
3730   <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span> <span class="comment">// Type of character the facet is instantiated on</span>
3731   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span> <span class="comment">// Type of character string passed to member functions.</span>
3732   <span class="keyword">typedef</span> <span class="identifier">InputIterator</span> <span class="identifier">iter_type</span><span class="special">;</span> <span class="comment">// Type of iterator used to scan the character buffer.</span>
3733
3734   <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.c" title="Constructor duration_get(size_t)"><code class="computeroutput"><span class="identifier">duration_get</span></code></a><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
3735
3736   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
3737   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get" title="Template Member Function get(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,duration&lt;Rep,Period&gt;&amp;,const char_type*, const char_type*) const"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special">(</span>
3738     <span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span>
3739     <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span>
3740     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span>
3741     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
3742     <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">,</span>
3743     <span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">pattern</span><span class="special">,</span>
3744     <span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">pat_end</span>
3745   <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
3746
3747   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
3748   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get2" title="Template Member Function get(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,duration&lt;Rep,Period&gt;&amp;) const"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special">(</span>
3749     <span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span>
3750     <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span>
3751     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span>
3752     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
3753     <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span>
3754   <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
3755
3756   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
3757   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get_value" title="Template Member Function get_value(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,Rep&amp;) const"><code class="computeroutput"><span class="identifier">get_value</span></code></a><span class="special">(</span>
3758     <span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span>
3759     <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span>
3760     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span>
3761     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
3762     <span class="identifier">Rep</span><span class="special">&amp;</span> <span class="identifier">r</span>
3763   <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
3764
3765   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get_unit" title="Member Function get_unit(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,rt_ratio&amp;) const"><code class="computeroutput"><span class="identifier">get_unit</span></code></a><span class="special">(</span>
3766     <span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span>
3767     <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span>
3768     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span>
3769     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
3770     <span class="identifier">detail</span><span class="special">::</span><span class="identifier">rt_ratio</span> <span class="special">&amp;</span><span class="identifier">rt</span>
3771   <span class="special">)</span> <span class="keyword">const</span>
3772
3773   <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> <span class="comment">// Unique identifier for this type of facet.</span>
3774
3775   <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.d" title="Destructor ~duration_get()"><code class="computeroutput"><span class="special">~</span><span class="identifier">duration_get</span></code></a><span class="special">()</span>
3776   <span class="special">{</span>
3777   <span class="special">}</span>
3778
3779 <span class="special">};</span>
3780 </pre>
3781 <p>
3782             The <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get"><code class="computeroutput"><span class="identifier">duration_get</span></code></a> facet extracts
3783             duration from a character string and stores the resulting value in a
3784             class duration d argument. The facet parses the string using a specific
3785             format as a guide. If the string does not fit the format, then the facet
3786             will indicate an error by setting the err argument to iosbase::failbit.
3787             In other words, user confirmation is required for reliable parsing of
3788             user-entered durations, but machine-generated formats can be parsed reliably.
3789             This allows parsers to be aggressive about interpreting user variations
3790             on standard formats.
3791           </p>
3792 <div class="section">
3793 <div class="titlepage"><div><div><h6 class="title">
3794 <a name="chrono.reference.io.duration_get_hpp.duration_get.c"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.c" title="Constructor duration_get(size_t)">Constructor
3795             <code class="computeroutput"><span class="identifier">duration_get</span><span class="special">(</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
3796 </h6></div></div></div>
3797 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">duration_get</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span><span class="special">);</span>
3798 </pre>
3799 <p>
3800               Constructs a <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get"><code class="computeroutput"><span class="identifier">duration_get</span></code></a> facet.
3801             </p>
3802 <p>
3803               <span class="bold"><strong>Parameters:</strong></span>
3804             </p>
3805 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
3806                   <span class="bold"><strong>refs:</strong></span> references
3807                 </li></ul></div>
3808 <p>
3809               <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get"><code class="computeroutput"><span class="identifier">duration_get</span></code></a> facet. If the
3810               <code class="computeroutput"><span class="identifier">refs</span></code> argument is <code class="computeroutput"><span class="number">0</span></code> then destruction of the object is delegated
3811               to the locale, or locales, containing it. This allows the user to ignore
3812               lifetime management issues. On the other had, if <code class="computeroutput"><span class="identifier">refs</span></code>
3813               is <code class="computeroutput"><span class="number">1</span></code> then the object must
3814               be explicitly deleted; <code class="computeroutput"><span class="identifier">locale</span></code>
3815               will not do so. In this case, the object can be maintained across the
3816               lifetime of multiple locales.
3817             </p>
3818 </div>
3819 <div class="section">
3820 <div class="titlepage"><div><div><h6 class="title">
3821 <a name="chrono.reference.io.duration_get_hpp.duration_get.d"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.d" title="Destructor ~duration_get()">Destructor
3822             <code class="computeroutput"><span class="special">~</span><span class="identifier">duration_get</span><span class="special">()</span></code></a>
3823 </h6></div></div></div>
3824 <pre class="programlisting"><span class="special">~</span><span class="identifier">duration_get</span><span class="special">();</span>
3825 </pre>
3826 <p>
3827               Destructs a <a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get"><code class="computeroutput"><span class="identifier">duration_get</span></code></a> facet.
3828             </p>
3829 </div>
3830 <div class="section">
3831 <div class="titlepage"><div><div><h6 class="title">
3832 <a name="chrono.reference.io.duration_get_hpp.duration_get.get"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get" title="Template Member Function get(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,duration&lt;Rep,Period&gt;&amp;,const char_type*, const char_type*) const">Template
3833             Member Function <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span><span class="identifier">Period</span><span class="special">&gt;&amp;,</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*,</span> <span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*)</span>
3834             <span class="keyword">const</span></code></a>
3835 </h6></div></div></div>
3836 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
3837 <span class="identifier">iter_type</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
3838     <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="special">&amp;</span><span class="identifier">d</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="identifier">pattern</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="identifier">pat_end</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
3839 </pre>
3840 <p>
3841               Extracts a duration from the range <code class="computeroutput"><span class="special">[</span><span class="identifier">s</span><span class="special">,</span><span class="identifier">end</span><span class="special">)</span></code>
3842               following the pattern <code class="computeroutput"><span class="special">[</span><span class="identifier">pattern</span><span class="special">,</span><span class="identifier">pat_end</span><span class="special">)</span></code>.
3843             </p>
3844 <p>
3845               <span class="bold"><strong>Parameters:</strong></span>
3846             </p>
3847 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
3848 <li class="listitem">
3849                   <span class="bold"><strong>s:</strong></span> start input stream iterator
3850                 </li>
3851 <li class="listitem">
3852                   <span class="bold"><strong>end:</strong></span> end input stream iterator
3853                 </li>
3854 <li class="listitem">
3855                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
3856                 </li>
3857 <li class="listitem">
3858                   <span class="bold"><strong>err:</strong></span> the ios_base state
3859                 </li>
3860 <li class="listitem">
3861                   <span class="bold"><strong>d:</strong></span> the duration
3862                 </li>
3863 <li class="listitem">
3864                   <span class="bold"><strong>pattern:</strong></span> begin of the formatting
3865                   pattern
3866                 </li>
3867 <li class="listitem">
3868                   <span class="bold"><strong>pat_end:</strong></span> end of the formatting
3869                   pattern
3870                 </li>
3871 </ul></div>
3872 <p>
3873               <span class="bold"><strong>Requires:</strong></span> <code class="computeroutput"><span class="special">[</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">end</span><span class="special">)</span> <span class="keyword">and</span> <span class="special">[</span><span class="identifier">pattern</span><span class="special">,</span>
3874               <span class="identifier">pat_end</span><span class="special">)</span></code>
3875               shall be valid ranges.
3876             </p>
3877 <p>
3878               <span class="bold"><strong>Effects:</strong></span> The function starts by evaluating
3879               <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span>
3880               <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">goodbit</span></code>.
3881             </p>
3882 <p>
3883               Then it computes an intermediate representation based on <code class="computeroutput"><span class="identifier">Rep</span></code> according to the following rules:
3884             </p>
3885 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
3886 <li class="listitem">
3887                   If <code class="computeroutput"><span class="identifier">Rep</span></code> is a floating
3888                   point type, the intermediate representation is <code class="computeroutput"><span class="keyword">long</span>
3889                   <span class="keyword">double</span></code>.
3890                 </li>
3891 <li class="listitem">
3892                   Else if <code class="computeroutput"><span class="identifier">Rep</span></code> is
3893                   a signed integral type, the intermediate representation is <code class="computeroutput"><span class="keyword">long</span> <span class="keyword">long</span></code>.
3894                 </li>
3895 <li class="listitem">
3896                   Else if <code class="computeroutput"><span class="identifier">Rep</span></code> is
3897                   an unsigned integral type, the intermediate representation is unsigned
3898                   long long.
3899                 </li>
3900 <li class="listitem">
3901                   Else intermediate representation is <code class="computeroutput"><span class="identifier">Rep</span></code>.
3902                 </li>
3903 </ul></div>
3904 <p>
3905               Next the following local variable <code class="computeroutput"><span class="identifier">r</span></code>
3906               of type intermediate representation and <code class="computeroutput"><span class="identifier">rt</span></code>
3907               of type <code class="computeroutput"><span class="identifier">rt_ratio</span></code> are
3908               default constructed.
3909             </p>
3910 <p>
3911               It then enters a loop, reading zero or more characters from <code class="computeroutput"><span class="identifier">s</span></code> at each iteration. Unless otherwise
3912               specified below, the loop terminates when the first of the following
3913               conditions holds:
3914             </p>
3915 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
3916 <li class="listitem">
3917                   The expression <code class="computeroutput"><span class="identifier">pattern</span>
3918                   <span class="special">==</span> <span class="identifier">pat_end</span></code>
3919                   evaluates to <code class="computeroutput"><span class="keyword">true</span></code>.
3920                 </li>
3921 <li class="listitem">
3922                   The expression <code class="computeroutput"><span class="identifier">err</span> <span class="special">==</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">goodbit</span></code>
3923                   evaluates to false.
3924                 </li>
3925 <li class="listitem">
3926                   The expression <code class="computeroutput"><span class="identifier">s</span> <span class="special">==</span> <span class="identifier">end</span></code>
3927                   evaluates to <code class="computeroutput"><span class="keyword">true</span></code>,
3928                   in which case the function evaluates <code class="computeroutput"><span class="identifier">err</span>
3929                   <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">eofbit</span>
3930                   <span class="special">|</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>.
3931                 </li>
3932 <li class="listitem">
3933                   The next element of pattern is equal to <code class="computeroutput"><span class="char">'%'</span></code>,
3934                   followed by a conversion specifier character, format. If the number
3935                   of elements in the range <code class="computeroutput"><span class="special">[</span><span class="identifier">pattern</span><span class="special">,</span><span class="identifier">pat_end</span><span class="special">)</span></code>
3936                   is not sufficient to unambiguously determine whether the conversion
3937                   specification is complete and valid, the function evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span>
3938                   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>. Otherwise, the function
3939                   evaluates <code class="computeroutput"><span class="identifier">s</span> <span class="special">=</span>
3940                   <span class="identifier">get_value</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span>
3941                   <span class="identifier">end</span><span class="special">,</span>
3942                   <span class="identifier">ios</span><span class="special">,</span>
3943                   <span class="identifier">err</span><span class="special">,</span>
3944                   <span class="identifier">r</span><span class="special">)</span></code>
3945                   when the conversion specification is 'v' and <code class="computeroutput"><span class="identifier">s</span>
3946                   <span class="special">=</span> <span class="identifier">get_value</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">rt</span><span class="special">)</span></code> when the conversion specification
3947                   is 'u'. If <code class="computeroutput"><span class="identifier">err</span> <span class="special">==</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">goodbit</span></code>
3948                   holds after the evaluation of the expression, the function increments
3949                   pattern to point just past the end of the conversion specification
3950                   and continues looping.
3951                 </li>
3952 <li class="listitem">
3953                   The expression <code class="computeroutput"><span class="identifier">isspace</span><span class="special">(*</span><span class="identifier">pattern</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">())</span></code> evaluates to <code class="computeroutput"><span class="keyword">true</span></code>,
3954                   in which case the function first increments pattern until <code class="computeroutput"><span class="identifier">pattern</span> <span class="special">==</span>
3955                   <span class="identifier">pat_end</span> <span class="special">||</span>
3956                   <span class="special">!</span><span class="identifier">isspace</span><span class="special">(*</span><span class="identifier">pattern</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">())</span></code> evaluates to <code class="computeroutput"><span class="keyword">true</span></code>,
3957                   then advances <code class="computeroutput"><span class="identifier">s</span></code>
3958                   until <code class="computeroutput"><span class="identifier">s</span> <span class="special">==</span>
3959                   <span class="identifier">end</span> <span class="special">||</span>
3960                   <span class="special">!</span><span class="identifier">isspace</span><span class="special">(*</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">())</span></code> is <code class="computeroutput"><span class="keyword">true</span></code>,
3961                   and finally resumes looping.
3962                 </li>
3963 <li class="listitem">
3964                   The next character read from <code class="computeroutput"><span class="identifier">s</span></code>
3965                   matches the element pointed to by pattern in a case-insensitive
3966                   comparison, in which case the function evaluates <code class="computeroutput"><span class="special">++</span><span class="identifier">pattern</span><span class="special">,</span> <span class="special">++</span><span class="identifier">s</span></code> and continues looping. Otherwise,
3967                   the function evaluates <code class="computeroutput"><span class="identifier">err</span>
3968                   <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>.
3969                 </li>
3970 </ul></div>
3971 <p>
3972               If a duration representation value and a unit specifier have successfully
3973               been parsed, compute <code class="computeroutput"><span class="special">(</span><span class="identifier">rt</span><span class="special">.</span><span class="identifier">num</span><span class="special">/</span><span class="identifier">rt</span><span class="special">.</span><span class="identifier">den</span><span class="special">)/(</span><span class="identifier">Period</span><span class="special">::</span><span class="identifier">num</span><span class="special">/</span><span class="identifier">Period</span><span class="special">::</span><span class="identifier">den</span><span class="special">)</span></code>
3974               reduced to lowest terms. If this ratio can not be stored without overflow,
3975               evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span>
3976               <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>. Otherwise store the result
3977               of this division in <code class="computeroutput"><span class="identifier">num</span></code>
3978               and <code class="computeroutput"><span class="identifier">den</span></code>.
3979             </p>
3980 <p>
3981               If the division did not result in overflow, then compute <code class="computeroutput"><span class="identifier">r</span> <span class="special">*</span> <span class="identifier">num</span> <span class="special">/</span> <span class="identifier">den</span></code> in such a way as to avoid intermediate
3982               overflow. If <code class="computeroutput"><span class="identifier">r</span></code> has
3983               integral type and this computation would not be exact, evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>. If the result of the computation
3984               would overflow <code class="computeroutput"><span class="identifier">Rep</span></code>,
3985               evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span>
3986               <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>. Otherwise the result of
3987               <code class="computeroutput"><span class="identifier">r</span> <span class="special">*</span>
3988               <span class="identifier">num</span> <span class="special">/</span>
3989               <span class="identifier">den</span></code> is used to construct
3990               a <code class="computeroutput"><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span></code>
3991               which is assigned to <code class="computeroutput"><span class="identifier">d</span></code>.
3992             </p>
3993 <p>
3994               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">s</span></code>,
3995               an iterator pointing just beyond the last character that can be determined
3996               to be part of a valid duration.
3997             </p>
3998 </div>
3999 <div class="section">
4000 <div class="titlepage"><div><div><h6 class="title">
4001 <a name="chrono.reference.io.duration_get_hpp.duration_get.get2"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get2" title="Template Member Function get(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,duration&lt;Rep,Period&gt;&amp;) const">Template
4002             Member Function <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span><span class="identifier">Period</span><span class="special">&gt;&amp;)</span>
4003             <span class="keyword">const</span></code></a>
4004 </h6></div></div></div>
4005 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4006 <span class="identifier">iter_type</span> <span class="identifier">get</span><span class="special">(</span>
4007   <span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span>
4008   <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span>
4009   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span>
4010   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
4011   <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span>
4012 <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4013 </pre>
4014 <p>
4015               Extracts a duration from the range <code class="computeroutput"><span class="special">[</span><span class="identifier">s</span><span class="special">,</span><span class="identifier">end</span><span class="special">)</span></code>
4016               following the default pattern.
4017             </p>
4018 <p>
4019               <span class="bold"><strong>Parameters:</strong></span>
4020             </p>
4021 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4022 <li class="listitem">
4023                   <span class="bold"><strong>s:</strong></span> start input stream iterator
4024                 </li>
4025 <li class="listitem">
4026                   <span class="bold"><strong>end:</strong></span> end input stream iterator
4027                 </li>
4028 <li class="listitem">
4029                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4030                 </li>
4031 <li class="listitem">
4032                   <span class="bold"><strong>err:</strong></span> the ios_base state
4033                 </li>
4034 <li class="listitem">
4035                   <span class="bold"><strong>d:</strong></span> the duration
4036                 </li>
4037 </ul></div>
4038 <p>
4039               <span class="bold"><strong>Effects:</strong></span> Stores the duration pattern
4040               from the __duration_unit facet associated to 'ios<code class="computeroutput"> <span class="identifier">in</span>
4041               <span class="identifier">let</span> <span class="identifier">say</span>
4042               </code>str`. Last as if
4043             </p>
4044 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">d</span><span class="special">,</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">size</span><span class="special">());</span>
4045 </pre>
4046 <p>
4047               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">s</span></code>,
4048               an iterator pointing just beyond the last character that can be determined
4049               to be part of a valid duration.
4050             </p>
4051 </div>
4052 <div class="section">
4053 <div class="titlepage"><div><div><h6 class="title">
4054 <a name="chrono.reference.io.duration_get_hpp.duration_get.get_value"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get_value" title="Template Member Function get_value(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,Rep&amp;) const">Template
4055             Member Function <code class="computeroutput"><span class="identifier">get_value</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">Rep</span><span class="special">&amp;)</span> <span class="keyword">const</span></code></a>
4056 </h6></div></div></div>
4057 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
4058 <span class="identifier">iter_type</span> <span class="identifier">get_value</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">Rep</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4059 </pre>
4060 <p>
4061               Extracts a duration representation from the range <code class="computeroutput"><span class="special">[</span><span class="identifier">s</span><span class="special">,</span><span class="identifier">end</span><span class="special">)</span></code>.
4062             </p>
4063 <p>
4064               <span class="bold"><strong>Parameters:</strong></span>
4065             </p>
4066 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4067 <li class="listitem">
4068                   <span class="bold"><strong>s:</strong></span> start input stream iterator
4069                 </li>
4070 <li class="listitem">
4071                   <span class="bold"><strong>end:</strong></span> end input stream iterator
4072                 </li>
4073 <li class="listitem">
4074                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4075                 </li>
4076 <li class="listitem">
4077                   <span class="bold"><strong>err:</strong></span> the ios_base state
4078                 </li>
4079 <li class="listitem">
4080                   <span class="bold"><strong>r:</strong></span> a reference to the duration
4081                   representation
4082                 </li>
4083 </ul></div>
4084 <p>
4085               <span class="bold"><strong>Effects:</strong></span> As if
4086             </p>
4087 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">use_facet</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">num_get</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">iter_type</span><span class="special">&gt;&gt;(</span><span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">()).</span><span class="identifier">get</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">r</span><span class="special">);</span>
4088 </pre>
4089 <p>
4090               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">s</span></code>,
4091               an iterator pointing just beyond the last character that can be determined
4092               to be part of a valid <code class="computeroutput"><span class="identifier">Rep</span></code>
4093               value.
4094             </p>
4095 </div>
4096 <div class="section">
4097 <div class="titlepage"><div><div><h6 class="title">
4098 <a name="chrono.reference.io.duration_get_hpp.duration_get.get_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get_unit" title="Member Function get_unit(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,rt_ratio&amp;) const">Member
4099             Function <code class="computeroutput"><span class="identifier">get_unit</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">rt_ratio</span><span class="special">&amp;)</span>
4100             <span class="keyword">const</span></code></a>
4101 </h6></div></div></div>
4102 <pre class="programlisting"><span class="identifier">iter_type</span> <span class="identifier">get_unit</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">rt_ratio</span> <span class="special">&amp;</span><span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4103 </pre>
4104 <p>
4105               Extracts a duration unit from the range <code class="computeroutput"><span class="special">[</span><span class="identifier">s</span><span class="special">,</span><span class="identifier">end</span><span class="special">)</span></code>.
4106             </p>
4107 <p>
4108               <span class="bold"><strong>Parameters:</strong></span>
4109             </p>
4110 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4111 <li class="listitem">
4112                   <span class="bold"><strong>s:</strong></span> start input stream iterator
4113                 </li>
4114 <li class="listitem">
4115                   <span class="bold"><strong>end:</strong></span> end input stream iterator
4116                 </li>
4117 <li class="listitem">
4118                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4119                 </li>
4120 <li class="listitem">
4121                   <span class="bold"><strong>err:</strong></span> the ios_base state
4122                 </li>
4123 <li class="listitem">
4124                   <span class="bold"><strong>rt:</strong></span> a reference to the duration
4125                   run-time ratio.
4126                 </li>
4127 </ul></div>
4128 <p>
4129               <span class="bold"><strong>Effects:</strong></span>
4130             </p>
4131 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
4132                   If the first character is <code class="computeroutput"><span class="char">'['</span></code>,
4133                   an attempt is made to consume a pattern of the form <code class="computeroutput"><span class="string">"[N/D]"</span></code> where <code class="computeroutput"><span class="identifier">N</span></code> and <code class="computeroutput"><span class="identifier">D</span></code>
4134                   have type <code class="computeroutput"><span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="keyword">long</span></code>.
4135                   <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
4136 <li class="listitem">
4137                         If successful, rt records the values of <code class="computeroutput"><span class="identifier">N</span></code>
4138                         and <code class="computeroutput"><span class="identifier">D</span></code>, otherwise
4139                         evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>
4140                         and return <code class="computeroutput"><span class="identifier">i</span></code>.
4141                       </li>
4142 <li class="listitem">
4143                         Return the parse the longest string possible matching one
4144                         of the durations units that can follow the pattern <code class="computeroutput"><span class="string">"[N/D]"</span></code>, as if
4145                       </li>
4146 </ul></div>
4147                 </li></ul></div>
4148 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">do_get_n_d_prefix_unit</span><span class="special">(</span><span class="identifier">facet</span><span class="special">,</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">err</span><span class="special">);</span>
4149 </pre>
4150 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
4151                   Otherwise the next character is not <code class="computeroutput"><span class="char">'['</span></code>.
4152                   Return the parse the longest string possible matching one of the
4153                   durations units, as if
4154                 </li></ul></div>
4155 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">do_get_prefix_unit</span><span class="special">(</span><span class="identifier">facet</span><span class="special">,</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">rt</span><span class="special">);</span>
4156 </pre>
4157 <p>
4158               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">i</span></code>,
4159               an iterator pointing just beyond the last character that can be determined
4160               to be part of a valid duration unit.
4161             </p>
4162 </div>
4163 <div class="section">
4164 <div class="titlepage"><div><div><h6 class="title">
4165 <a name="chrono.reference.io.duration_get_hpp.duration_get.do_get_n_d_prefix_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.do_get_n_d_prefix_unit" title="Protected Member Function do_get_n_d_prefix_unit(duration_units&lt;CharT&gt; const&amp;,iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;) const">Protected
4166             Member Function <code class="computeroutput"><span class="identifier">do_get_n_d_prefix_unit</span><span class="special">(</span><span class="identifier">duration_units</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;)</span> <span class="keyword">const</span></code></a>
4167 </h6></div></div></div>
4168 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">iter_type</span> <span class="identifier">do_get_n_d_prefix_unit</span><span class="special">(</span>
4169   <span class="identifier">duration_units</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">facet</span><span class="special">,</span>
4170   <span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span>
4171   <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span>
4172   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span>
4173   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span>
4174 <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4175 </pre>
4176 <p>
4177               Extracts the run-time ratio associated to the duration when it is given
4178               in [N/D] form.
4179             </p>
4180 <p>
4181               This is an extension point of this facet so that we can take in account
4182               other periods that can have a useful translation in other contexts,
4183               as e.g. days and weeks.
4184             </p>
4185 <p>
4186               <span class="bold"><strong>Parameters:</strong></span>
4187             </p>
4188 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4189 <li class="listitem">
4190                   <span class="bold"><strong>s:</strong></span> start input stream iterator
4191                 </li>
4192 <li class="listitem">
4193                   <span class="bold"><strong>end:</strong></span> end input stream iterator
4194                 </li>
4195 <li class="listitem">
4196                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4197                 </li>
4198 <li class="listitem">
4199                   <span class="bold"><strong>err:</strong></span> the ios_base state
4200                 </li>
4201 <li class="listitem">
4202                   <span class="bold"><strong>rt:</strong></span> a reference to the duration
4203                   run-time ratio.
4204                 </li>
4205 </ul></div>
4206 <p>
4207               <span class="bold"><strong>Effects:</strong></span> Scan <code class="computeroutput"><span class="identifier">s</span></code>
4208               for the longest of all the plural forms associated with the duration
4209               units. If successful, sets the matched ratio in <code class="computeroutput"><span class="identifier">rt</span></code>.
4210               Otherwise evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>.
4211             </p>
4212 <p>
4213               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">s</span></code>,
4214               an iterator pointing just beyond the last character that can be determined
4215               to be part of a valid name.
4216             </p>
4217 </div>
4218 <div class="section">
4219 <div class="titlepage"><div><div><h6 class="title">
4220 <a name="chrono.reference.io.duration_get_hpp.duration_get.do_get_prefix_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.do_get_prefix_unit" title="Protected Member Function do_get_prefix_unit(duration_units&lt;CharT&gt; const&amp;,iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,detail::rt_ratio&amp;) const">Protected
4221             Member Function <code class="computeroutput"><span class="identifier">do_get_prefix_unit</span><span class="special">(</span><span class="identifier">duration_units</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">rt_ratio</span><span class="special">&amp;)</span> <span class="keyword">const</span></code></a>
4222 </h6></div></div></div>
4223 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">iter_type</span> <span class="identifier">do_get_prefix_unit</span><span class="special">(</span>
4224   <span class="identifier">duration_units</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">facet</span><span class="special">,</span>
4225   <span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span>
4226   <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span>
4227   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span>
4228   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
4229   <span class="identifier">detail</span><span class="special">::</span><span class="identifier">rt_ratio</span> <span class="special">&amp;</span><span class="identifier">rt</span>
4230 <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4231 </pre>
4232 <p>
4233               Extracts the run-time ratio associated to the duration when it is given
4234               in prefix form.
4235             </p>
4236 <p>
4237               This is an extension point of this facet so that we can take in account
4238               other periods that can have a useful translation in other contexts,
4239               as e.g. days and weeks.
4240             </p>
4241 <p>
4242               <span class="bold"><strong>Parameters:</strong></span>
4243             </p>
4244 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4245 <li class="listitem">
4246                   <span class="bold"><strong>s:</strong></span> start input stream iterator
4247                 </li>
4248 <li class="listitem">
4249                   <span class="bold"><strong>end:</strong></span> end input stream iterator
4250                 </li>
4251 <li class="listitem">
4252                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4253                 </li>
4254 <li class="listitem">
4255                   <span class="bold"><strong>err:</strong></span> the ios_base state
4256                 </li>
4257 <li class="listitem">
4258                   <span class="bold"><strong>rt:</strong></span> a reference to the duration
4259                   run-time ratio.
4260                 </li>
4261 </ul></div>
4262 <p>
4263               <span class="bold"><strong>Effects:</strong></span> Scan <code class="computeroutput"><span class="identifier">s</span></code>
4264               for the longest of all the plural forms associated with the duration
4265               units. If successful, sets the matched ratio in <code class="computeroutput"><span class="identifier">rt</span></code>.
4266               Otherwise evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>.
4267             </p>
4268 <p>
4269               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">s</span></code>,
4270               an iterator pointing just beyond the last character that can be determined
4271               to be part of a valid name.
4272             </p>
4273 </div>
4274 </div>
4275 </div>
4276 <div class="section">
4277 <div class="titlepage"><div><div><h4 class="title">
4278 <a name="chrono.reference.io.duration_put_hpp"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp" title="Header &lt;boost/chrono/io/duration_put.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_put</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
4279 </h4></div></div></div>
4280 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.io.duration_put_hpp.duration_put">Template
4281           Class <code class="computeroutput"><span class="identifier">duration_put</span></code></a></span></dt></dl></div>
4282 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
4283   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
4284
4285     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OutputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
4286     <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a><span class="special">;</span>
4287
4288   <span class="special">}</span>
4289 <span class="special">}</span>
4290 </pre>
4291 <div class="section">
4292 <div class="titlepage"><div><div><h5 class="title">
4293 <a name="chrono.reference.io.duration_put_hpp.duration_put"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put">Template
4294           Class <code class="computeroutput"><span class="identifier">duration_put</span></code></a>
4295 </h5></div></div></div>
4296 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OutputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
4297 <span class="keyword">class</span> <span class="identifier">duration_put</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">facet</span>
4298 <span class="special">{</span>
4299 <span class="keyword">public</span><span class="special">:</span>
4300   <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span> <span class="comment">// Type of character the facet is instantiated on.</span>
4301   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span> <span class="comment">// Type of character string passed to member functions.</span>
4302   <span class="keyword">typedef</span> <span class="identifier">OutputIterator</span> <span class="identifier">iter_type</span><span class="special">;</span> <span class="comment">// Type of iterator used to write in the character buffer.</span>
4303
4304   <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.c" title="Constructor duration_put(size_t)"><code class="computeroutput"><span class="identifier">duration_put</span></code></a><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
4305
4306   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4307   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put" title="Member Function put(iter_type,std::ios_base&amp;,char_type,duration&lt;Rep,Period&gt; const&amp;, const CharT*,const CharT*)"><code class="computeroutput"><span class="identifier">put</span></code></a><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pattern</span><span class="special">,</span>
4308       <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pat_end</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4309
4310   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4311   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put2" title="Member Function put(iter_type,std::ios_base&amp;,char_type fill, duration&lt;Rep, Period&gt; const&amp;)"><code class="computeroutput"><span class="identifier">put</span></code></a><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4312
4313   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4314   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put_value" title="Member Function put_value(iter_type, std::ios_base&amp;, char_type, duration&lt;Rep,Period&gt; const&amp;)"><code class="computeroutput"><span class="identifier">put_value</span></code></a><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4315
4316   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4317   <span class="identifier">iter_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put_unit" title="Member Function put_unit(iter_type,std::ios_base&amp;,char_type,duration&lt;Rep, Period&gt; const&amp;)"><code class="computeroutput"><span class="identifier">put_unit</span></code></a><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4318
4319
4320   <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> <span class="comment">// Unique identifier for this type of facet.</span>
4321
4322   <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.d" title="Destructor ~duration_put()"><code class="computeroutput"><span class="special">~</span><span class="identifier">duration_put</span></code></a><span class="special">();</span>
4323 <span class="special">};</span>
4324 </pre>
4325 <div class="section">
4326 <div class="titlepage"><div><div><h6 class="title">
4327 <a name="chrono.reference.io.duration_put_hpp.duration_put.c"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.c" title="Constructor duration_put(size_t)">Constructor
4328             <code class="computeroutput"><span class="identifier">duration_put</span><span class="special">(</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
4329 </h6></div></div></div>
4330 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">duration_put</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span><span class="special">);</span>
4331 </pre>
4332 <p>
4333               Constructs a <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a> facet.
4334             </p>
4335 <p>
4336               <span class="bold"><strong>Parameters:</strong></span>
4337             </p>
4338 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
4339                   <span class="bold"><strong>refs:</strong></span> references
4340                 </li></ul></div>
4341 <p>
4342               <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a> facet. If the
4343               <code class="computeroutput"><span class="identifier">refs</span></code> argument is <code class="computeroutput"><span class="number">0</span></code> then destruction of the object is delegated
4344               to the locale, or locales, containing it. This allows the user to ignore
4345               lifetime management issues. On the other had, if <code class="computeroutput"><span class="identifier">refs</span></code>
4346               is <code class="computeroutput"><span class="number">1</span></code> then the object must
4347               be explicitly deleted; <code class="computeroutput"><span class="identifier">locale</span></code>
4348               will not do so. In this case, the object can be maintained across the
4349               lifetime of multiple locales.
4350             </p>
4351 </div>
4352 <div class="section">
4353 <div class="titlepage"><div><div><h6 class="title">
4354 <a name="chrono.reference.io.duration_put_hpp.duration_put.d"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.d" title="Destructor ~duration_put()">Destructor
4355             <code class="computeroutput"><span class="special">~</span><span class="identifier">duration_put</span><span class="special">()</span></code></a>
4356 </h6></div></div></div>
4357 <pre class="programlisting"><span class="special">~</span><span class="identifier">duration_put</span><span class="special">();</span>
4358 </pre>
4359 <p>
4360               Destructs a <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a> facet.
4361             </p>
4362 </div>
4363 <div class="section">
4364 <div class="titlepage"><div><div><h6 class="title">
4365 <a name="chrono.reference.io.duration_put_hpp.duration_put.put"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put" title="Member Function put(iter_type,std::ios_base&amp;,char_type,duration&lt;Rep,Period&gt; const&amp;, const CharT*,const CharT*)">Member
4366             Function <code class="computeroutput"><span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">char_type</span><span class="special">,</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span><span class="identifier">Period</span><span class="special">&gt;</span>
4367             <span class="keyword">const</span><span class="special">&amp;,</span>
4368             <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*,</span><span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*)</span></code></a>
4369 </h6></div></div></div>
4370 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4371 <span class="identifier">iter_type</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pattern</span><span class="special">,</span>
4372     <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pat_end</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4373 </pre>
4374 <p>
4375               <span class="bold"><strong>Parameters:</strong></span>
4376             </p>
4377 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4378 <li class="listitem">
4379                   <span class="bold"><strong>s:</strong></span> an output stream iterator
4380                 </li>
4381 <li class="listitem">
4382                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4383                 </li>
4384 <li class="listitem">
4385                   <span class="bold"><strong>d:</strong></span> the duration
4386                 </li>
4387 <li class="listitem">
4388                   <span class="bold"><strong>pattern:</strong></span> begin of the formatting
4389                   pattern
4390                 </li>
4391 <li class="listitem">
4392                   <span class="bold"><strong>pat_end:</strong></span> end of the formatting
4393                   pattern
4394                 </li>
4395 </ul></div>
4396 <p>
4397               <span class="bold"><strong>Effects:</strong></span> Steps through the sequence
4398               from <code class="computeroutput"><span class="identifier">pattern</span></code> to <code class="computeroutput"><span class="identifier">pat_end</span></code>, identifying characters that
4399               are part of a pattern sequence. Each character that is not part of
4400               a pattern sequence is written to <code class="computeroutput"><span class="identifier">s</span></code>
4401               immediately, and each pattern sequence, as it is identified, results
4402               in a call to <code class="computeroutput"><span class="identifier">put_value</span></code>
4403               or <code class="computeroutput"><span class="identifier">put_unit</span></code>; thus,
4404               pattern elements and other characters are interleaved in the output
4405               in the order in which they appear in the pattern. Pattern sequences
4406               are identified by converting each character <code class="computeroutput"><span class="identifier">c</span></code>
4407               to a <code class="computeroutput"><span class="keyword">char</span></code> value as if
4408               by <code class="computeroutput"><span class="identifier">ct</span><span class="special">.</span><span class="identifier">narrow</span><span class="special">(</span><span class="identifier">c</span><span class="special">,</span><span class="number">0</span><span class="special">)</span></code>, where
4409               <code class="computeroutput"><span class="identifier">ct</span></code> is a reference to
4410               <code class="computeroutput"><span class="identifier">ctype</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</span></code>
4411               obtained from <code class="computeroutput"><span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">()</span></code>.
4412               The first character of each sequence is equal to <code class="computeroutput"><span class="char">'%'</span></code>,
4413               followed by a pattern specifier character specifier, which can be
4414               <code class="computeroutput"><span class="char">'v'</span></code> for the duration value
4415               or <code class="computeroutput"><span class="char">'u'</span></code> for the duration unit.
4416               . For each valid pattern sequence identified, calls <code class="computeroutput"><span class="identifier">put_value</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">d</span><span class="special">)</span></code> or <code class="computeroutput"><span class="identifier">put_unit</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">d</span><span class="special">)</span></code>.
4417             </p>
4418 <p>
4419               <span class="bold"><strong>Returns:</strong></span> An iterator pointing immediately
4420               after the last character produced.
4421             </p>
4422 </div>
4423 <div class="section">
4424 <div class="titlepage"><div><div><h6 class="title">
4425 <a name="chrono.reference.io.duration_put_hpp.duration_put.put2"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put2" title="Member Function put(iter_type,std::ios_base&amp;,char_type fill, duration&lt;Rep, Period&gt; const&amp;)">Member
4426             Function <code class="computeroutput"><span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;)</span></code></a>
4427 </h6></div></div></div>
4428 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4429 <span class="identifier">iter_type</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4430 </pre>
4431 <p>
4432               <span class="bold"><strong>Parameters:</strong></span>
4433             </p>
4434 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4435 <li class="listitem">
4436                   <span class="bold"><strong>s:</strong></span> an output stream iterator
4437                 </li>
4438 <li class="listitem">
4439                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4440                 </li>
4441 <li class="listitem">
4442                   <span class="bold"><strong>d:</strong></span> the duration
4443                 </li>
4444 </ul></div>
4445 <p>
4446               Retrieves Stores the duration pattern from the __duration_unit facet
4447               in let say <code class="computeroutput"><span class="identifier">str</span></code>. Last
4448               as if
4449             </p>
4450 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">d</span><span class="special">,</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">size</span><span class="special">());</span>
4451 </pre>
4452 <p>
4453               <span class="bold"><strong>Returns:</strong></span> An iterator pointing immediately
4454               after the last character produced.
4455             </p>
4456 </div>
4457 <div class="section">
4458 <div class="titlepage"><div><div><h6 class="title">
4459 <a name="chrono.reference.io.duration_put_hpp.duration_put.put_value"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put_value" title="Member Function put_value(iter_type, std::ios_base&amp;, char_type, duration&lt;Rep,Period&gt; const&amp;)">Member
4460             Function <code class="computeroutput"><span class="identifier">put_value</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span>
4461             <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span>
4462             <span class="identifier">char_type</span><span class="special">,</span>
4463             <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span><span class="identifier">Period</span><span class="special">&gt;</span>
4464             <span class="keyword">const</span><span class="special">&amp;)</span></code></a>
4465 </h6></div></div></div>
4466 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4467 <span class="identifier">iter_type</span> <span class="identifier">put_value</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4468 </pre>
4469 <p>
4470               <span class="bold"><strong>Parameters:</strong></span>
4471             </p>
4472 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4473 <li class="listitem">
4474                   <span class="bold"><strong>s:</strong></span> an output stream iterator
4475                 </li>
4476 <li class="listitem">
4477                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4478                 </li>
4479 <li class="listitem">
4480                   <span class="bold"><strong>d:</strong></span> the duration
4481                 </li>
4482 </ul></div>
4483 <p>
4484               <span class="bold"><strong>Effects:</strong></span> As if std::use_facet&lt;std::num_put&lt;CharT,
4485               iter_type&gt; &gt;(ios.getloc()).put(s, ios, ' ', static_cast&lt;long
4486               int&gt; (d.count())).
4487             </p>
4488 <p>
4489               <span class="bold"><strong>Returns:</strong></span> An iterator pointing immediately
4490               after the last character produced.
4491             </p>
4492 </div>
4493 <div class="section">
4494 <div class="titlepage"><div><div><h6 class="title">
4495 <a name="chrono.reference.io.duration_put_hpp.duration_put.put_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put_unit" title="Member Function put_unit(iter_type,std::ios_base&amp;,char_type,duration&lt;Rep, Period&gt; const&amp;)">Member
4496             Function <code class="computeroutput"><span class="identifier">put_unit</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">char_type</span><span class="special">,</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4497             <span class="keyword">const</span><span class="special">&amp;)</span></code></a>
4498 </h6></div></div></div>
4499 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4500 <span class="identifier">iter_type</span> <span class="identifier">put_unit</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4501 </pre>
4502 <p>
4503               <span class="bold"><strong>Parameters:</strong></span>
4504             </p>
4505 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4506 <li class="listitem">
4507                   <span class="bold"><strong>s:</strong></span> an output stream iterator
4508                 </li>
4509 <li class="listitem">
4510                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
4511                 </li>
4512 <li class="listitem">
4513                   <span class="bold"><strong>fill:</strong></span> the fill character
4514                 </li>
4515 <li class="listitem">
4516                   <span class="bold"><strong>d:</strong></span> the duration
4517                 </li>
4518 </ul></div>
4519 <p>
4520               <span class="bold"><strong>Effects:</strong></span> Let <code class="computeroutput"><span class="identifier">facet</span></code>
4521               be the <code class="computeroutput"><span class="identifier">duration_units</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code> facet associated to <code class="computeroutput"><span class="identifier">ios</span></code>. If the associated unit is named,
4522               as if
4523             </p>
4524 <pre class="programlisting"><span class="identifier">string_type</span> <span class="identifier">str</span> <span class="special">=</span> <span class="identifier">facet</span><span class="special">.</span><span class="identifier">get_unit</span><span class="special">(</span><span class="identifier">get_duration_style</span><span class="special">(</span><span class="identifier">ios</span><span class="special">),</span> <span class="identifier">d</span><span class="special">);</span>
4525 <span class="identifier">s</span><span class="special">=</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">str</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">);</span>
4526 </pre>
4527 <p>
4528               Otherwise, format the unit as <code class="computeroutput"><span class="string">"[Period::num/Period::den]"</span></code>
4529               followed by the unit associated to [N/D] obtained using <code class="computeroutput"><span class="identifier">facet</span><span class="special">.</span><span class="identifier">get_n_d_unit</span><span class="special">(</span><span class="identifier">get_duration_style</span><span class="special">(</span><span class="identifier">ios</span><span class="special">),</span> <span class="identifier">d</span><span class="special">)</span></code>.
4530             </p>
4531 <p>
4532               <span class="bold"><strong>Returns:</strong></span> s, iterator pointing immediately
4533               after the last character produced.
4534             </p>
4535 </div>
4536 </div>
4537 </div>
4538 <div class="section">
4539 <div class="titlepage"><div><div><h4 class="title">
4540 <a name="chrono.reference.io.duration_units_hpp"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp" title="Header &lt;boost/chrono/io/duration_units.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_units</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
4541 </h4></div></div></div>
4542 <div class="toc"><dl class="toc">
4543 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_units_hpp.rt_ratio">Class
4544           <code class="computeroutput"><span class="identifier">rt_ratio</span></code></a></span></dt>
4545 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_units_hpp.duration_units">Template
4546           Class <code class="computeroutput"><span class="identifier">duration_units</span></code></a></span></dt>
4547 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default">Template
4548           Class <code class="computeroutput"><span class="identifier">duration_units_default</span></code></a></span></dt>
4549 </dl></div>
4550 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
4551   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
4552     <span class="keyword">class</span> <span class="identifier">rt_ratio</span><span class="special">;</span>
4553     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">&gt;</span>
4554     <span class="keyword">class</span> <span class="identifier">duration_units</span><span class="special">;</span>
4555
4556   <span class="special">}</span>
4557 <span class="special">}</span>
4558 </pre>
4559 <div class="section">
4560 <div class="titlepage"><div><div><h5 class="title">
4561 <a name="chrono.reference.io.duration_units_hpp.rt_ratio"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.rt_ratio" title="Class rt_ratio">Class
4562           <code class="computeroutput"><span class="identifier">rt_ratio</span></code></a>
4563 </h5></div></div></div>
4564 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">rt_ratio</span>
4565 <span class="special">{</span>
4566 <span class="keyword">public</span><span class="special">:</span>
4567   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4568   <span class="identifier">rt_ratio</span><span class="special">(</span><span class="identifier">Period</span> <span class="keyword">const</span><span class="special">&amp;)</span> <span class="special">:</span>
4569     <span class="identifier">num</span><span class="special">(</span><span class="identifier">Period</span><span class="special">::</span><span class="identifier">type</span><span class="special">::</span><span class="identifier">num</span><span class="special">),</span> <span class="identifier">den</span><span class="special">(</span><span class="identifier">Period</span><span class="special">::</span><span class="identifier">type</span><span class="special">::</span><span class="identifier">den</span><span class="special">)</span>
4570   <span class="special">{</span>
4571   <span class="special">}</span>
4572
4573   <span class="identifier">rt_ratio</span><span class="special">(</span><span class="identifier">intmax_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">d</span> <span class="special">=</span> <span class="number">1</span><span class="special">)</span> <span class="special">:</span>
4574     <span class="identifier">num</span><span class="special">(</span><span class="identifier">n</span><span class="special">),</span> <span class="identifier">den</span><span class="special">(</span><span class="identifier">d</span><span class="special">)</span>
4575   <span class="special">{</span>
4576   <span class="special">}</span>
4577
4578   <span class="identifier">intmax_t</span> <span class="identifier">num</span><span class="special">;</span>
4579   <span class="identifier">intmax_t</span> <span class="identifier">den</span><span class="special">;</span>
4580 <span class="special">};</span>
4581 </pre>
4582 </div>
4583 <div class="section">
4584 <div class="titlepage"><div><div><h5 class="title">
4585 <a name="chrono.reference.io.duration_units_hpp.duration_units"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units" title="Template Class duration_units">Template
4586           Class <code class="computeroutput"><span class="identifier">duration_units</span></code></a>
4587 </h5></div></div></div>
4588 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">&gt;</span>
4589 <span class="keyword">class</span> <span class="identifier">duration_units</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">facet</span>
4590 <span class="special">{</span>
4591 <span class="keyword">public</span><span class="special">:</span>
4592   <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span> <span class="comment">// Type of character the facet is instantiated on.</span>
4593   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span> <span class="comment">// Type of character string passed to member functions.</span>
4594   <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> <span class="comment">// Unique identifier for this type of facet.</span>
4595
4596   <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.c" title="Constructor duration_units()"><code class="computeroutput"><span class="identifier">duration_units</span></code></a><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
4597   <span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_n_d_valid_units_start" title="Member Function get_n_d_valid_units_start()"><code class="computeroutput"><span class="identifier">get_n_d_valid_units_start</span></code></a><span class="special">()</span> <span class="keyword">const</span> <span class="special">=</span><span class="number">0</span><span class="special">;</span>
4598   <span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_n_d_valid_units_end" title="Member Function get_n_d_valid_units_end()"><code class="computeroutput"><span class="identifier">get_n_d_valid_units_end</span></code></a><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4599   <span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_valid_units_start" title="Member Function get_valid_units_start()"><code class="computeroutput"><span class="identifier">get_valid_units_start</span></code></a><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4600   <span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_valid_units_end" title="Member Function get_valid_units_end()"><code class="computeroutput"><span class="identifier">get_valid_units_end</span></code></a><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4601   <span class="keyword">virtual</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.match_n_d_valid_unit" title="Member Function match_n_d_valid_unit(const string_type*)"><code class="computeroutput"><span class="identifier">match_n_d_valid_unit</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4602   <span class="keyword">virtual</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.match_valid_unit" title="Member Function match_valid_unit(const string_type*,rt_ratio&amp;)"><code class="computeroutput"><span class="identifier">match_valid_unit</span></code></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">,</span> <span class="identifier">rt_ratio</span><span class="special">&amp;</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4603   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_pattern" title="Member Function get_pattern()"><code class="computeroutput"><span class="identifier">get_pattern</span></code></a><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4604   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4605   <span class="identifier">string_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_unit" title="Template Member Function get_unit(duration_style,duration&lt;Rep,Period&gt; const&amp;)"><code class="computeroutput"><span class="identifier">get_unit</span></code></a><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4606   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4607   <span class="identifier">string_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_n_d_unit" title="Template Member Function get_n_d_unit(duration_style,duration&lt;Rep,Period&gt; const&amp;)"><code class="computeroutput"><span class="identifier">get_n_d_unit</span></code></a><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4608   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4609   <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.is_named_unit" title="Template Member Function is_named_unit()"><code class="computeroutput"><span class="identifier">is_named_unit</span></code></a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
4610
4611 <span class="keyword">protected</span><span class="special">:</span>
4612   <span class="keyword">virtual</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.d" title="Destructor ~duration_units()"><code class="computeroutput"><span class="special">~</span><span class="identifier">duration_units</span></code></a><span class="special">();</span>
4613   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.do_get_n_d_unit" title="Protected Member Function do_get_n_d_unit(duration_style,rt_ratio,intmax_t)"><code class="computeroutput"><span class="identifier">do_get_n_d_unit</span></code></a><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4614   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.do_get_unit" title="Protected Member Function do_get_unit(duration_style,rt_ratio,intmax_t)"><code class="computeroutput"><span class="identifier">do_get_unit</span></code></a><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span><span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4615   <span class="keyword">virtual</span> <span class="keyword">bool</span> <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.do_is_named_unit" title="Protected Member Function do_is_named_unit(rt_ratio)"><code class="computeroutput"><span class="identifier">do_is_named_unit</span></code></a><span class="special">(</span><span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span><span class="number">0</span><span class="special">;</span>
4616 <span class="special">};</span>
4617 </pre>
4618 <p>
4619             <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units" title="Template Class duration_units"><code class="computeroutput"><span class="identifier">duration_units</span></code></a> facet gives useful
4620             information about the duration units, as the number of plural forms,
4621             the plural form associated to a duration, the text associated to a plural
4622             form and a duration's period,
4623           </p>
4624 <div class="section">
4625 <div class="titlepage"><div><div><h6 class="title">
4626 <a name="chrono.reference.io.duration_units_hpp.duration_units.c"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.c" title="Constructor duration_units()">Constructor
4627             <code class="computeroutput"><span class="identifier">duration_units</span><span class="special">()</span></code></a>
4628 </h6></div></div></div>
4629 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">duration_units</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
4630 </pre>
4631 <p>
4632               Construct a <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units" title="Template Class duration_units"><code class="computeroutput"><span class="identifier">duration_units</span></code></a> facet.
4633             </p>
4634 <p>
4635               <span class="bold"><strong>Parameters:</strong></span>
4636             </p>
4637 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
4638                   <span class="bold"><strong>refs:</strong></span> references
4639                 </li></ul></div>
4640 <p>
4641               <span class="bold"><strong>Effects:</strong></span> Construct a <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units" title="Template Class duration_units"><code class="computeroutput"><span class="identifier">duration_units</span></code></a> facet. If the
4642               <code class="computeroutput"><span class="identifier">refs</span></code> argument is <code class="computeroutput"><span class="number">0</span></code> then destruction of the object is delegated
4643               to the locale, or locales, containing it. This allows the user to ignore
4644               lifetime management issues. On the other had, if <code class="computeroutput"><span class="identifier">refs</span></code>
4645               is <code class="computeroutput"><span class="number">1</span></code> then the object must
4646               be explicitly deleted; the locale will not do so. In this case, the
4647               object can be maintained across the lifetime of multiple locales.
4648             </p>
4649 </div>
4650 <div class="section">
4651 <div class="titlepage"><div><div><h6 class="title">
4652 <a name="chrono.reference.io.duration_units_hpp.duration_units.d"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.d" title="Destructor ~duration_units()">Destructor
4653             <code class="computeroutput"><span class="special">~</span><span class="identifier">duration_units</span><span class="special">()</span></code></a>
4654 </h6></div></div></div>
4655 <pre class="programlisting"><span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">duration_units</span><span class="special">();</span>
4656 </pre>
4657 <p>
4658               <span class="bold"><strong>Effects:</strong></span> Destroys the facet.
4659             </p>
4660 </div>
4661 <div class="section">
4662 <div class="titlepage"><div><div><h6 class="title">
4663 <a name="chrono.reference.io.duration_units_hpp.duration_units.get_n_d_valid_units_start"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_n_d_valid_units_start" title="Member Function get_n_d_valid_units_start()">Member
4664             Function <code class="computeroutput"><span class="identifier">get_n_d_valid_units_start</span><span class="special">()</span></code></a>
4665 </h6></div></div></div>
4666 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_n_d_valid_units_start</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">=</span><span class="number">0</span><span class="special">;</span>
4667 </pre>
4668 <p>
4669               <span class="bold"><strong>Returns:</strong></span> pointer to the start of valid
4670               [N/D] units.
4671             </p>
4672 </div>
4673 <div class="section">
4674 <div class="titlepage"><div><div><h6 class="title">
4675 <a name="chrono.reference.io.duration_units_hpp.duration_units.get_n_d_valid_units_end"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_n_d_valid_units_end" title="Member Function get_n_d_valid_units_end()">Member
4676             Function <code class="computeroutput"><span class="identifier">get_n_d_valid_units_end</span><span class="special">()</span></code></a>
4677 </h6></div></div></div>
4678 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_n_d_valid_units_end</span><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4679 </pre>
4680 <p>
4681               <span class="bold"><strong>Returns:</strong></span> pointer to the end of valid
4682               [N/D] units.
4683             </p>
4684 </div>
4685 <div class="section">
4686 <div class="titlepage"><div><div><h6 class="title">
4687 <a name="chrono.reference.io.duration_units_hpp.duration_units.get_valid_units_start"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_valid_units_start" title="Member Function get_valid_units_start()">Member
4688             Function <code class="computeroutput"><span class="identifier">get_valid_units_start</span><span class="special">()</span></code></a>
4689 </h6></div></div></div>
4690 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_valid_units_start</span><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4691 </pre>
4692 <p>
4693               <span class="bold"><strong>Returns:</strong></span> pointer to the start of valid
4694               units, symbol or prefix with its different plural forms.
4695             </p>
4696 </div>
4697 <div class="section">
4698 <div class="titlepage"><div><div><h6 class="title">
4699 <a name="chrono.reference.io.duration_units_hpp.duration_units.get_valid_units_end"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_valid_units_end" title="Member Function get_valid_units_end()">Member
4700             Function <code class="computeroutput"><span class="identifier">get_valid_units_end</span><span class="special">()</span></code></a>
4701 </h6></div></div></div>
4702 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_valid_units_end</span><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4703 </pre>
4704 <p>
4705               <span class="bold"><strong>Returns:</strong></span> pointer to the end of valid
4706               units.
4707             </p>
4708 </div>
4709 <div class="section">
4710 <div class="titlepage"><div><div><h6 class="title">
4711 <a name="chrono.reference.io.duration_units_hpp.duration_units.match_n_d_valid_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.match_n_d_valid_unit" title="Member Function match_n_d_valid_unit(const string_type*)">Member
4712             Function <code class="computeroutput"><span class="identifier">match_n_d_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*)</span></code></a>
4713 </h6></div></div></div>
4714 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">match_n_d_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4715 </pre>
4716 <p>
4717               <span class="bold"><strong>Parameters:</strong></span>
4718             </p>
4719 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
4720                   <span class="bold"><strong>k:</strong></span> the found pointer to the [N/D]
4721                   unit.
4722                 </li></ul></div>
4723 <p>
4724               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="keyword">true</span></code>
4725               if <code class="computeroutput"><span class="identifier">k</span></code> matches a valid
4726               unit.
4727             </p>
4728 </div>
4729 <div class="section">
4730 <div class="titlepage"><div><div><h6 class="title">
4731 <a name="chrono.reference.io.duration_units_hpp.duration_units.match_valid_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.match_valid_unit" title="Member Function match_valid_unit(const string_type*,rt_ratio&amp;)">Member
4732             Function <code class="computeroutput"><span class="identifier">match_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*,</span><span class="identifier">rt_ratio</span><span class="special">&amp;)</span></code></a>
4733 </h6></div></div></div>
4734 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">match_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">,</span> <span class="identifier">rt_ratio</span><span class="special">&amp;</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4735 </pre>
4736 <p>
4737               <span class="bold"><strong>Parameters:</strong></span>
4738             </p>
4739 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
4740                   <span class="bold"><strong>k:</strong></span> the found pointer to the unit.
4741                 </li></ul></div>
4742 <p>
4743               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rt</span></code>
4744               is set to the valid Period when the <code class="computeroutput"><span class="identifier">k</span></code>
4745               matches a valid unit. <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="identifier">k</span></code>
4746               matches a valid unit.
4747             </p>
4748 </div>
4749 <div class="section">
4750 <div class="titlepage"><div><div><h6 class="title">
4751 <a name="chrono.reference.io.duration_units_hpp.duration_units.get_pattern"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_pattern" title="Member Function get_pattern()">Member
4752             Function <code class="computeroutput"><span class="identifier">get_pattern</span><span class="special">()</span></code></a>
4753 </h6></div></div></div>
4754 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">get_pattern</span><span class="special">()</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
4755 </pre>
4756 <p>
4757               <span class="bold"><strong>Returns:</strong></span> the pattern to be used by
4758               default.
4759             </p>
4760 </div>
4761 <div class="section">
4762 <div class="titlepage"><div><div><h6 class="title">
4763 <a name="chrono.reference.io.duration_units_hpp.duration_units.get_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_unit" title="Template Member Function get_unit(duration_style,duration&lt;Rep,Period&gt; const&amp;)">Template
4764             Member Function <code class="computeroutput"><span class="identifier">get_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span><span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;)</span></code></a>
4765 </h6></div></div></div>
4766 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4767 <span class="identifier">string_type</span> <span class="identifier">get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4768 </pre>
4769 <p>
4770               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">get_unit</span><span class="special">(</span><span class="identifier">style</span><span class="special">,</span> <span class="identifier">d</span><span class="special">.</span><span class="identifier">count</span><span class="special">(),</span> <span class="identifier">rt_ratio</span><span class="special">(</span><span class="identifier">Period</span><span class="special">()))</span></code>, the unit associated to this duration.
4771             </p>
4772 </div>
4773 <div class="section">
4774 <div class="titlepage"><div><div><h6 class="title">
4775 <a name="chrono.reference.io.duration_units_hpp.duration_units.get_n_d_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.get_n_d_unit" title="Template Member Function get_n_d_unit(duration_style,duration&lt;Rep,Period&gt; const&amp;)">Template
4776             Member Function <code class="computeroutput"><span class="identifier">get_n_d_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span><span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;)</span></code></a>
4777 </h6></div></div></div>
4778 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4779 <span class="identifier">string_type</span> <span class="identifier">get_n_d_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4780 </pre>
4781 <p>
4782               <span class="bold"><strong>Returns:</strong></span> get_n_d_unit(style, d.count(),
4783               rt_ratio(Period())), i.e. the [N/D] suffix unit associated to this
4784               duration.
4785             </p>
4786 </div>
4787 <div class="section">
4788 <div class="titlepage"><div><div><h6 class="title">
4789 <a name="chrono.reference.io.duration_units_hpp.duration_units.is_named_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.is_named_unit" title="Template Member Function is_named_unit()">Template
4790             Member Function <code class="computeroutput"><span class="identifier">is_named_unit</span><span class="special">()</span></code></a>
4791 </h6></div></div></div>
4792 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
4793 <span class="keyword">bool</span> <span class="identifier">is_named_unit</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
4794 </pre>
4795 <p>
4796               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">do_is_named_unit</span><span class="special">(</span><span class="identifier">rt_ratio</span><span class="special">(</span><span class="identifier">Period</span><span class="special">()))</span></code>, true if the unit associated to
4797               the given Period is named, false otherwise.
4798             </p>
4799 </div>
4800 <div class="section">
4801 <div class="titlepage"><div><div><h6 class="title">
4802 <a name="chrono.reference.io.duration_units_hpp.duration_units.do_get_n_d_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.do_get_n_d_unit" title="Protected Member Function do_get_n_d_unit(duration_style,rt_ratio,intmax_t)">Protected
4803             Member Function <code class="computeroutput"><span class="identifier">do_get_n_d_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">rt_ratio</span><span class="special">,</span><span class="identifier">intmax_t</span><span class="special">)</span></code></a>
4804 </h6></div></div></div>
4805 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_n_d_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4806 </pre>
4807 <p>
4808               <span class="bold"><strong>Returns:</strong></span> the [N/D] suffix unit associated
4809               to this duration.
4810             </p>
4811 </div>
4812 <div class="section">
4813 <div class="titlepage"><div><div><h6 class="title">
4814 <a name="chrono.reference.io.duration_units_hpp.duration_units.do_get_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.do_get_unit" title="Protected Member Function do_get_unit(duration_style,rt_ratio,intmax_t)">Protected
4815             Member Function <code class="computeroutput"><span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">rt_ratio</span><span class="special">,</span><span class="identifier">intmax_t</span><span class="special">)</span></code></a>
4816 </h6></div></div></div>
4817 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span><span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
4818 </pre>
4819 <p>
4820               <span class="bold"><strong>Returns:</strong></span> the unit associated to this
4821               duration.
4822             </p>
4823 </div>
4824 <div class="section">
4825 <div class="titlepage"><div><div><h6 class="title">
4826 <a name="chrono.reference.io.duration_units_hpp.duration_units.do_is_named_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units.do_is_named_unit" title="Protected Member Function do_is_named_unit(rt_ratio)">Protected
4827             Member Function <code class="computeroutput"><span class="identifier">do_is_named_unit</span><span class="special">(</span><span class="identifier">rt_ratio</span><span class="special">)</span></code></a>
4828 </h6></div></div></div>
4829 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">do_is_named_unit</span><span class="special">(</span><span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span><span class="number">0</span><span class="special">;</span>
4830 </pre>
4831 <p>
4832               <span class="bold"><strong>Returns:</strong></span> true if the unit associated
4833               to the given Period is named, false otherwise.
4834             </p>
4835 </div>
4836 </div>
4837 <div class="section">
4838 <div class="titlepage"><div><div><h5 class="title">
4839 <a name="chrono.reference.io.duration_units_hpp.duration_units_default"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default" title="Template Class duration_units_default">Template
4840           Class <code class="computeroutput"><span class="identifier">duration_units_default</span></code></a>
4841 </h5></div></div></div>
4842 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">&gt;</span>
4843 <span class="keyword">class</span> <span class="identifier">duration_units_default</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">duration_units</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span>
4844 <span class="special">{</span>
4845 <span class="keyword">protected</span><span class="special">:</span>
4846   <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pfs_</span> <span class="special">=</span> <span class="number">2</span><span class="special">;</span> <span class="comment">// The default English facet has two plural forms.</span>
4847
4848 <span class="keyword">public</span><span class="special">:</span>
4849   <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span>
4850   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span>
4851
4852   <span class="keyword">explicit</span> <span class="identifier">duration_units_default</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
4853   <span class="special">~</span><span class="identifier">duration_units_default</span><span class="special">();</span>
4854
4855   <span class="keyword">bool</span> <span class="identifier">match_n_d_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4856   <span class="keyword">bool</span> <span class="identifier">match_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">,</span> <span class="identifier">rt_ratio</span><span class="special">&amp;</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4857   <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_n_d_valid_units_start</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
4858   <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_n_d_valid_units_end</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
4859   <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_valid_units_start</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
4860   <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_valid_units_end</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
4861   <span class="identifier">string_type</span> <span class="identifier">get_pattern</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
4862 <span class="keyword">protected</span><span class="special">:</span>
4863   <span class="keyword">bool</span> <span class="identifier">do_is_named_unit</span><span class="special">(</span><span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4864   <span class="identifier">string_type</span> <span class="identifier">do_get_n_d_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">rt_ratio</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4865   <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4866
4867   <span class="keyword">virtual</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">do_get_plural_forms</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
4868   <span class="keyword">virtual</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">do_get_plural_form</span><span class="special">(</span><span class="identifier">int_least64_t</span> <span class="identifier">value</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4869
4870   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4871   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">60</span><span class="special">&gt;</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4872   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">3600</span><span class="special">&gt;</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4873   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">atto</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4874   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">femto</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4875   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">pico</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4876   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">nano</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4877   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">micro</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4878   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">milli</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4879   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">centi</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4880   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deci</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4881   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deca</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4882   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">hecto</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4883   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">kilo</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4884   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">mega</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4885   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">giga</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4886   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">tera</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4887   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">peta</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4888   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">exa</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4889
4890   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">atto</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4891   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">femto</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4892   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">pico</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4893   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">nano</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4894   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">micro</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4895   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">milli</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4896   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">centi</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4897   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deci</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4898   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deca</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4899   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">hecto</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4900   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">kilo</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4901   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">mega</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4902   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">giga</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4903   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">tera</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4904   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">peta</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4905   <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">exa</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
4906 <span class="special">};</span>
4907 </pre>
4908 <p>
4909             This class is used to define the strings for the default English. This
4910             facet names the units associated to the following periods:
4911           </p>
4912 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
4913 <li class="listitem">
4914                 <code class="computeroutput"><span class="identifier">atto</span></code>,
4915               </li>
4916 <li class="listitem">
4917                 <code class="computeroutput"><span class="identifier">femto</span></code>,
4918               </li>
4919 <li class="listitem">
4920                 <code class="computeroutput"><span class="identifier">pico</span></code>,
4921               </li>
4922 <li class="listitem">
4923                 <code class="computeroutput"><span class="identifier">nano</span></code>,
4924               </li>
4925 <li class="listitem">
4926                 <code class="computeroutput"><span class="identifier">micro</span></code>,
4927               </li>
4928 <li class="listitem">
4929                 <code class="computeroutput"><span class="identifier">milli</span></code>,
4930               </li>
4931 <li class="listitem">
4932                 <code class="computeroutput"><span class="identifier">centi</span></code>,
4933               </li>
4934 <li class="listitem">
4935                 <code class="computeroutput"><span class="identifier">deci</span></code>,
4936               </li>
4937 <li class="listitem">
4938                 ratio&lt;1&gt;,
4939               </li>
4940 <li class="listitem">
4941                 <code class="computeroutput"><span class="identifier">deca</span></code>,
4942               </li>
4943 <li class="listitem">
4944                 <code class="computeroutput"><span class="identifier">hecto</span></code>,
4945               </li>
4946 <li class="listitem">
4947                 <code class="computeroutput"><span class="identifier">kilo</span></code>,
4948               </li>
4949 <li class="listitem">
4950                 <code class="computeroutput"><span class="identifier">mega</span></code>,
4951               </li>
4952 <li class="listitem">
4953                 <code class="computeroutput"><span class="identifier">giga</span></code>,
4954               </li>
4955 <li class="listitem">
4956                 <code class="computeroutput"><span class="identifier">tera</span></code>,
4957               </li>
4958 <li class="listitem">
4959                 <code class="computeroutput"><span class="identifier">peta</span></code>,
4960               </li>
4961 <li class="listitem">
4962                 <code class="computeroutput"><span class="identifier">exa</span></code>,
4963               </li>
4964 <li class="listitem">
4965                 ratio&lt;60&gt; and
4966               </li>
4967 <li class="listitem">
4968                 ratio&lt;3600&gt;.
4969               </li>
4970 </ul></div>
4971 <div class="section">
4972 <div class="titlepage"><div><div><h6 class="title">
4973 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.c"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.c" title="Constructor duration_units_default()">Constructor
4974             <code class="computeroutput"><span class="identifier">duration_units_default</span><span class="special">()</span></code></a>
4975 </h6></div></div></div>
4976 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">duration_units_default</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
4977 </pre>
4978 <p>
4979               Construct a duration_units_default facet.
4980             </p>
4981 <p>
4982               <span class="bold"><strong>Parameters:</strong></span>
4983             </p>
4984 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
4985                   <span class="bold"><strong>refs:</strong></span> references
4986                 </li></ul></div>
4987 <p>
4988               <span class="bold"><strong>Effects:</strong></span> Construct a duration_units_default
4989               facet. If the <code class="computeroutput"><span class="identifier">refs</span></code>
4990               argument is <code class="computeroutput"><span class="number">0</span></code> then destruction
4991               of the object is delegated to the locale, or locales, containing it.
4992               This allows the user to ignore lifetime management issues. On the other
4993               had, if <code class="computeroutput"><span class="identifier">refs</span></code> is <code class="computeroutput"><span class="number">1</span></code> then the object must be explicitly
4994               deleted; the locale will not do so. In this case, the object can be
4995               maintained across the lifetime of multiple locales.
4996             </p>
4997 </div>
4998 <div class="section">
4999 <div class="titlepage"><div><div><h6 class="title">
5000 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.d"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.d" title="Destructor ~duration_units_default()">Destructor
5001             <code class="computeroutput"><span class="special">~</span><span class="identifier">duration_units_default</span><span class="special">()</span></code></a>
5002 </h6></div></div></div>
5003 <pre class="programlisting"><span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">duration_units_default</span><span class="special">();</span>
5004 </pre>
5005 <p>
5006               <span class="bold"><strong>Effects:</strong></span> Destroys the facet.
5007             </p>
5008 </div>
5009 <div class="section">
5010 <div class="titlepage"><div><div><h6 class="title">
5011 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.get_n_d_valid_units_start"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.get_n_d_valid_units_start" title="Member Function get_n_d_valid_units_start()">Member
5012             Function <code class="computeroutput"><span class="identifier">get_n_d_valid_units_start</span><span class="special">()</span></code></a>
5013 </h6></div></div></div>
5014 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_n_d_valid_units_start</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
5015 </pre>
5016 <p>
5017               <span class="bold"><strong>Returns:</strong></span> pointer to the start of valid
5018               [N/D] units.
5019             </p>
5020 </div>
5021 <div class="section">
5022 <div class="titlepage"><div><div><h6 class="title">
5023 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.get_n_d_valid_units_end"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.get_n_d_valid_units_end" title="Member Function get_n_d_valid_units_end()">Member
5024             Function <code class="computeroutput"><span class="identifier">get_n_d_valid_units_end</span><span class="special">()</span></code></a>
5025 </h6></div></div></div>
5026 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_n_d_valid_units_end</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
5027 </pre>
5028 <p>
5029               <span class="bold"><strong>Returns:</strong></span> pointer to the end of valid
5030               [N/D] units.
5031             </p>
5032 </div>
5033 <div class="section">
5034 <div class="titlepage"><div><div><h6 class="title">
5035 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.get_valid_units_start"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.get_valid_units_start" title="Member Function get_valid_units_start()">Member
5036             Function <code class="computeroutput"><span class="identifier">get_valid_units_start</span><span class="special">()</span></code></a>
5037 </h6></div></div></div>
5038 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_valid_units_start</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
5039 </pre>
5040 <p>
5041               <span class="bold"><strong>Returns:</strong></span> pointer to the start of valid
5042               units, symbol or prefix with its different plural forms.
5043             </p>
5044 </div>
5045 <div class="section">
5046 <div class="titlepage"><div><div><h6 class="title">
5047 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.get_valid_units_end"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.get_valid_units_end" title="Member Function get_valid_units_end()">Member
5048             Function <code class="computeroutput"><span class="identifier">get_valid_units_end</span><span class="special">()</span></code></a>
5049 </h6></div></div></div>
5050 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">get_valid_units_end</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
5051 </pre>
5052 <p>
5053               <span class="bold"><strong>Returns:</strong></span> pointer to the end of valid
5054               units.
5055             </p>
5056 </div>
5057 <div class="section">
5058 <div class="titlepage"><div><div><h6 class="title">
5059 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.match_n_d_valid_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.match_n_d_valid_unit" title="Member Function match_n_d_valid_unit(const string_type*)">Member
5060             Function <code class="computeroutput"><span class="identifier">match_n_d_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*)</span></code></a>
5061 </h6></div></div></div>
5062 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">match_n_d_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5063 </pre>
5064 <p>
5065               <span class="bold"><strong>Parameters:</strong></span>
5066             </p>
5067 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
5068                   <span class="bold"><strong>k:</strong></span> the found pointer to the [N/D]
5069                   unit.
5070                 </li></ul></div>
5071 <p>
5072               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="keyword">true</span></code>
5073               if <code class="computeroutput"><span class="identifier">k</span></code> matches a valid
5074               unit.
5075             </p>
5076 </div>
5077 <div class="section">
5078 <div class="titlepage"><div><div><h6 class="title">
5079 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.match_valid_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.match_valid_unit" title="Member Function match_valid_unit(const string_type*,rt_ratio&amp;)">Member
5080             Function <code class="computeroutput"><span class="identifier">match_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*,</span><span class="identifier">rt_ratio</span><span class="special">&amp;)</span></code></a>
5081 </h6></div></div></div>
5082 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">match_valid_unit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">string_type</span><span class="special">*</span> <span class="identifier">k</span><span class="special">,</span> <span class="identifier">rt_ratio</span><span class="special">&amp;</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5083 </pre>
5084 <p>
5085               <span class="bold"><strong>Parameters:</strong></span>
5086             </p>
5087 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
5088                   <span class="bold"><strong>k:</strong></span> the found pointer to the unit.
5089                 </li></ul></div>
5090 <p>
5091               <span class="bold"><strong>Effects:</strong></span> <code class="computeroutput"><span class="identifier">rt</span></code>
5092               is set to the valid Period when the <code class="computeroutput"><span class="identifier">k</span></code>
5093               matches a valid unit. <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="identifier">k</span></code>
5094               matches a valid unit.
5095             </p>
5096 </div>
5097 <div class="section">
5098 <div class="titlepage"><div><div><h6 class="title">
5099 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.get_pattern"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.get_pattern" title="Member Function get_pattern()">Member
5100             Function <code class="computeroutput"><span class="identifier">get_pattern</span><span class="special">()</span></code></a>
5101 </h6></div></div></div>
5102 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">get_pattern</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
5103 </pre>
5104 <p>
5105               <span class="bold"><strong>Returns:</strong></span> the pattern to be used by
5106               default.
5107             </p>
5108 </div>
5109 <div class="section">
5110 <div class="titlepage"><div><div><h6 class="title">
5111 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_n_d_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_n_d_unit" title="Protected Member Function do_get_n_d_unit(duration_style,rt_ratio,intmax_t)">Protected
5112             Member Function <code class="computeroutput"><span class="identifier">do_get_n_d_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">rt_ratio</span><span class="special">,</span><span class="identifier">intmax_t</span><span class="special">)</span></code></a>
5113 </h6></div></div></div>
5114 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_n_d_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5115 </pre>
5116 <p>
5117               <span class="bold"><strong>Returns:</strong></span> the [N/D] suffix unit associated
5118               to this duration.
5119             </p>
5120 </div>
5121 <div class="section">
5122 <div class="titlepage"><div><div><h6 class="title">
5123 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit" title="Protected Member Function do_get_unit(duration_style,rt_ratio,intmax_t)">Protected
5124             Member Function <code class="computeroutput"><span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">rt_ratio</span><span class="special">,</span><span class="identifier">intmax_t</span><span class="special">)</span></code></a>
5125 </h6></div></div></div>
5126 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span><span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">,</span> <span class="identifier">intmax_t</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5127 </pre>
5128 <p>
5129               <span class="bold"><strong>Returns:</strong></span> the unit associated to this
5130               duration.
5131             </p>
5132 </div>
5133 <div class="section">
5134 <div class="titlepage"><div><div><h6 class="title">
5135 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_is_named_unit"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_is_named_unit" title="Protected Member Function do_is_named_unit(rt_ratio)">Protected
5136             Member Function <code class="computeroutput"><span class="identifier">do_is_named_unit</span><span class="special">(</span><span class="identifier">rt_ratio</span><span class="special">)</span></code></a>
5137 </h6></div></div></div>
5138 <pre class="programlisting"><span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">do_is_named_unit</span><span class="special">(</span><span class="identifier">rt_ratio</span> <span class="identifier">rt</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5139 </pre>
5140 <p>
5141               <span class="bold"><strong>Returns:</strong></span> true if the unit associated
5142               to the given Period is named, false otherwise.
5143             </p>
5144 </div>
5145 <div class="section">
5146 <div class="titlepage"><div><div><h6 class="title">
5147 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_plural_forms"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_plural_forms" title="Protected Member Function do_get_plural_forms()">Protected
5148             Member Function <code class="computeroutput"><span class="identifier">do_get_plural_forms</span><span class="special">()</span></code></a>
5149 </h6></div></div></div>
5150 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">do_get_plural_forms</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
5151 </pre>
5152 <p>
5153               <span class="bold"><strong>Returns:</strong></span> the number of associated
5154               plural forms this facet manages.
5155             </p>
5156 </div>
5157 <div class="section">
5158 <div class="titlepage"><div><div><h6 class="title">
5159 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_plural_form"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_plural_form" title="Protected Member Function do_get_plural_form(int_least64_t)">Protected
5160             Member Function <code class="computeroutput"><span class="identifier">do_get_plural_form</span><span class="special">(</span><span class="identifier">int_least64_t</span><span class="special">)</span></code></a>
5161 </h6></div></div></div>
5162 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">do_get_plural_form</span><span class="special">(</span><span class="identifier">int_least64_t</span> <span class="identifier">value</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5163 </pre>
5164 <p>
5165               Gets the associated plural form.
5166             </p>
5167 <p>
5168               <span class="bold"><strong>Parameters:</strong></span>
5169             </p>
5170 <p>
5171               <span class="bold"><strong>value:</strong></span> the duration representation
5172             </p>
5173 <p>
5174               <span class="bold"><strong>Returns:</strong></span> the plural form associated
5175               to the <code class="computeroutput"><span class="identifier">value</span></code> parameter.
5176               In English there are 2 plural forms
5177             </p>
5178 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5179 <li class="listitem">
5180                   0 singular (-1 or 1)
5181                 </li>
5182 <li class="listitem">
5183                   1 plural for all others
5184                 </li>
5185 </ul></div>
5186 </div>
5187 <div class="section">
5188 <div class="titlepage"><div><div><h6 class="title">
5189 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_seconds"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_seconds" title="Protected Member Function do_get_unit(duration_style,ratio&lt;1&gt;,std::size_t)">Protected
5190             Member Function <code class="computeroutput"><span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
5191 </h6></div></div></div>
5192 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5193 </pre>
5194 <p>
5195               <span class="bold"><strong>Parameters:</strong></span>
5196             </p>
5197 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5198 <li class="listitem">
5199                   <span class="bold"><strong>style:</strong></span> the duration style.
5200                 </li>
5201 <li class="listitem">
5202                   <span class="bold"><strong>period:</strong></span> the period associated
5203                   to the duration hours.
5204                 </li>
5205 <li class="listitem">
5206                   <span class="bold"><strong>pf:</strong></span> the requested plural form.
5207                 </li>
5208 </ul></div>
5209 <p>
5210               <span class="bold"><strong>Returns:</strong></span> if style is symbol returns
5211               "s", otherwise if pf is 0 return "second", if pf
5212               is 1 "seconds"
5213             </p>
5214 </div>
5215 <div class="section">
5216 <div class="titlepage"><div><div><h6 class="title">
5217 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_minutes"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_minutes" title="Protected Member Function do_get_unit(duration_style style,ratio&lt;60&gt;,std::size_t)">Protected
5218             Member Function <code class="computeroutput"><span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span>
5219             <span class="identifier">style</span><span class="special">,</span><span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">60</span><span class="special">&gt;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
5220 </h6></div></div></div>
5221 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">60</span><span class="special">&gt;</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5222 </pre>
5223 <p>
5224               <span class="bold"><strong>Parameters:</strong></span>
5225             </p>
5226 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5227 <li class="listitem">
5228                   <span class="bold"><strong>style:</strong></span> the duration style.
5229                 </li>
5230 <li class="listitem">
5231                   <span class="bold"><strong>period:</strong></span> the period associated
5232                   to the duration hours.
5233                 </li>
5234 <li class="listitem">
5235                   <span class="bold"><strong>pf:</strong></span> the requested plural form.
5236                 </li>
5237 </ul></div>
5238 <p>
5239               <span class="bold"><strong>Returns:</strong></span> if style is symbol returns
5240               "min", otherwise if pf is 0 return "minute", if
5241               pf is 1 "minutes"
5242             </p>
5243 </div>
5244 <div class="section">
5245 <div class="titlepage"><div><div><h6 class="title">
5246 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_hours"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_hours" title="Protected Member Function do_get_unit(duration_style,ratio&lt;3600&gt;,std::size_t)">Protected
5247             Member Function <code class="computeroutput"><span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">3600</span><span class="special">&gt;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
5248 </h6></div></div></div>
5249 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">ratio</span><span class="special">&lt;</span><span class="number">3600</span><span class="special">&gt;</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5250 </pre>
5251 <p>
5252               <span class="bold"><strong>Parameters:</strong></span>
5253             </p>
5254 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5255 <li class="listitem">
5256                   <span class="bold"><strong>style:</strong></span> the duration style.
5257                 </li>
5258 <li class="listitem">
5259                   <span class="bold"><strong>period:</strong></span> the period associated
5260                   to the duration hours.
5261                 </li>
5262 <li class="listitem">
5263                   <span class="bold"><strong>pf:</strong></span> the requested plural form.
5264                 </li>
5265 </ul></div>
5266 <p>
5267               <span class="bold"><strong>Returns:</strong></span> if style is symbol returns
5268               "h", otherwise if pf is 0 return "hour", if pf
5269               is 1 "hours"
5270             </p>
5271 </div>
5272 <div class="section">
5273 <div class="titlepage"><div><div><h6 class="title">
5274 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_xxx"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_unit_xxx" title="Protected Member Function do_get_unit(duration_style,Period,std::size_t)">Protected
5275             Member Function <code class="computeroutput"><span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span><span class="identifier">Period</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
5276 </h6></div></div></div>
5277 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">atto</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5278 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">femto</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5279 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">pico</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5280 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">nano</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5281 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">micro</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5282 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">milli</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5283 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">centi</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5284 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deci</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5285 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deca</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5286 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">hecto</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5287 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">kilo</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5288 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">mega</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5289 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">giga</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5290 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">tera</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5291 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">peta</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5292 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_unit</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">exa</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">pf</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5293 </pre>
5294 <p>
5295               <span class="bold"><strong>Parameters:</strong></span>
5296             </p>
5297 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5298 <li class="listitem">
5299                   <span class="bold"><strong>style:</strong></span> the duration style.
5300                 </li>
5301 <li class="listitem">
5302                   <span class="bold"><strong>u:</strong></span> the period tag atto.
5303                 </li>
5304 <li class="listitem">
5305                   <span class="bold"><strong>pf:</strong></span> the requested plural form.
5306                 </li>
5307 </ul></div>
5308 <p>
5309               <span class="bold"><strong>Returns:</strong></span> the concatenation of the
5310               prefix associated to period <code class="computeroutput"><span class="identifier">u</span></code>
5311               + the one associated to seconds.
5312             </p>
5313 </div>
5314 <div class="section">
5315 <div class="titlepage"><div><div><h6 class="title">
5316 <a name="chrono.reference.io.duration_units_hpp.duration_units_default.do_get_ratio_prefix_xxx"></a><a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units_default.do_get_ratio_prefix_xxx" title="Protected Member Function do_get_ratio_prefix(duration_style, Period)">Protected
5317             Member Function <code class="computeroutput"><span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">)</span></code></a>
5318 </h6></div></div></div>
5319 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">atto</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5320 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">femto</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5321 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">pico</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5322 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">nano</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5323 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">micro</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5324 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">milli</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5325 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">centi</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5326 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deci</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5327 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">deca</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5328 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">hecto</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5329 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">kilo</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5330 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">mega</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5331 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">giga</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5332 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">tera</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5333 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">peta</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5334 <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_ratio_prefix</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">style</span><span class="special">,</span> <span class="identifier">exa</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5335 </pre>
5336 <p>
5337               <span class="bold"><strong>Parameters:</strong></span>
5338             </p>
5339 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5340 <li class="listitem">
5341                   <span class="bold"><strong>style:</strong></span> the duration style.
5342                 </li>
5343 <li class="listitem">
5344                   <span class="bold"><strong>u:</strong></span> the period tag atto.
5345                 </li>
5346 </ul></div>
5347 <p>
5348               <span class="bold"><strong>Returns:</strong></span> depending on the value of
5349               <code class="computeroutput"><span class="identifier">style</span></code> return the ratio_string
5350               symbol or prefix.
5351             </p>
5352 </div>
5353 </div>
5354 </div>
5355 <div class="section">
5356 <div class="titlepage"><div><div><h4 class="title">
5357 <a name="chrono.reference.io.duration_io_hpp"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp" title="Header &lt;boost/chrono/io/duration_io.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">duration_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
5358 </h4></div></div></div>
5359 <div class="toc"><dl class="toc">
5360 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_io_hpp.manipulators">I/O
5361           Manipulators</a></span></dt>
5362 <dt><span class="section"><a href="reference.html#chrono.reference.io.duration_io_hpp.streams">I/O
5363           Streams Operations</a></span></dt>
5364 </dl></div>
5365 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
5366   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
5367
5368     <span class="comment">// manipulators</span>
5369
5370     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.symbol_format" title="Non Member Function symbol_format(ios_base&amp;)"><code class="computeroutput"><span class="identifier">symbol_format</span></code></a><span class="special">(</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
5371     <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.name_format" title="Non Member Function name_format(ios_base&amp;)"><code class="computeroutput"><span class="identifier">name_format</span></code></a><span class="special">(</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
5372     <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt" title="Template Class duration_fmt"><code class="computeroutput"><span class="identifier">duration_fmt</span></code></a><span class="special">;</span>
5373     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
5374     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5375     <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_out" title="Member Function operator &lt;&lt;(basic_ostream&lt;&gt;&amp;, duration_fmt)"><code class="computeroutput"><span class="keyword">operator</span> <span class="special">&lt;&lt;</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">duration_fmt</span> <span class="identifier">d</span><span class="special">);</span>
5376
5377     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
5378     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5379     <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_in" title="Member Function operator &gt;&gt;(basic_istream&lt;&gt;&amp;, duration_fmt)"><code class="computeroutput"><span class="keyword">operator</span> <span class="special">&gt;&gt;</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">duration_fmt</span> <span class="identifier">d</span><span class="special">);</span>
5380
5381
5382     <span class="comment">// duration I/O</span>
5383
5384     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
5385         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5386         <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.streams.duration__op_out" title="Member Function operator &lt;&lt;(basic_ostream&lt;&gt;&amp;, const duration&lt;&gt;&amp; d)"><code class="computeroutput"><span class="keyword">operator</span> <span class="special">&lt;&lt;</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
5387
5388     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
5389         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5390         <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.streams.duration__op_in" title="Member Function operator &lt;&lt;(basic_istream&lt;&gt;&amp;, const duration&lt;&gt;&amp; d)"><code class="computeroutput"><span class="keyword">operator</span> <span class="special">&gt;&gt;</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span>
5391
5392   <span class="special">}</span>
5393 <span class="special">}</span>
5394 </pre>
5395 <div class="section">
5396 <div class="titlepage"><div><div><h5 class="title">
5397 <a name="chrono.reference.io.duration_io_hpp.manipulators"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators" title="I/O Manipulators">I/O
5398           Manipulators</a>
5399 </h5></div></div></div>
5400 <p>
5401             There is a parameterized manipulator that takes the duration_style as
5402             parameter. The symbol or name format can be easily chosen by streaming
5403             a <code class="computeroutput"><span class="identifier">symbol_format</span></code> or <code class="computeroutput"><span class="identifier">name_format</span></code> manipulators respectively.
5404           </p>
5405 <div class="section">
5406 <div class="titlepage"><div><div><h6 class="title">
5407 <a name="chrono.reference.io.duration_io_hpp.manipulators.duration_fmt"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt" title="Template Class duration_fmt">Template
5408             Class <code class="computeroutput"><span class="identifier">duration_fmt</span></code></a>
5409 </h6></div></div></div>
5410 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">duration_fmt</span>
5411 <span class="special">{</span>
5412 <span class="keyword">public</span><span class="special">:</span>
5413
5414   <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.c1" title="Constructor duration_fmt(duration_style)"><code class="computeroutput"><span class="identifier">duration_fmt</span></code></a><span class="special">(</span><a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a> <span class="identifier">style</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
5415
5416 <span class="preprocessor">#ifndef</span> <span class="identifier">BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS</span>
5417   <span class="keyword">explicit</span>
5418   <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_duration_style" title="Member Function operator duration_style()"><code class="computeroutput"><span class="keyword">operator</span> <span class="identifier">duration_style</span></code></a><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
5419 <span class="preprocessor">#endif</span>
5420   <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a> <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_duration_style" title="Member Function operator duration_style()"><code class="computeroutput"><span class="identifier">get_duration_style</span></code></a><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
5421 <span class="special">};</span>
5422
5423 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
5424 <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5425 <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_out" title="Member Function operator &lt;&lt;(basic_ostream&lt;&gt;&amp;, duration_fmt)"><code class="computeroutput"><span class="keyword">operator</span> <span class="special">&lt;&lt;</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">duration_fmt</span> <span class="identifier">d</span><span class="special">);</span>
5426
5427 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
5428 <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5429 <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_in" title="Member Function operator &gt;&gt;(basic_istream&lt;&gt;&amp;, duration_fmt)"><code class="computeroutput"><span class="keyword">operator</span> <span class="special">&gt;&gt;</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">duration_fmt</span> <span class="identifier">d</span><span class="special">);</span>
5430 </pre>
5431 <div class="section">
5432 <div class="titlepage"><div><div><h6 class="title">
5433 <a name="chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.c1"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.c1" title="Constructor duration_fmt(duration_style)">Constructor
5434               <code class="computeroutput"><span class="identifier">duration_fmt</span><span class="special">(</span><span class="identifier">duration_style</span><span class="special">)</span></code></a>
5435 </h6></div></div></div>
5436 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">duration_fmt</span><span class="special">(</span><span class="identifier">duration_style</span> <span class="identifier">f</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
5437 </pre>
5438 <p>
5439                 <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt" title="Template Class duration_fmt"><code class="computeroutput"><span class="identifier">duration_fmt</span></code></a> by storing
5440                 <code class="computeroutput"><span class="identifier">f</span></code>.
5441               </p>
5442 <p>
5443                 <span class="bold"><strong>Post Conditions:</strong></span> <code class="computeroutput"><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">duration_style</span><span class="special">&gt;(*</span><span class="keyword">this</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">f</span></code>.
5444               </p>
5445 </div>
5446 <div class="section">
5447 <div class="titlepage"><div><div><h6 class="title">
5448 <a name="chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_duration_style"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_duration_style" title="Member Function operator duration_style()">Member
5449               Function <code class="computeroutput"><span class="keyword">operator</span> <span class="identifier">duration_style</span><span class="special">()</span></code></a>
5450 </h6></div></div></div>
5451 <pre class="programlisting"><span class="keyword">explicit</span> <span class="keyword">operator</span> <span class="identifier">duration_style</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
5452 <span class="identifier">duration_style</span> <span class="identifier">get_duration_style</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
5453 </pre>
5454 <p>
5455                 <span class="bold"><strong>Returns:</strong></span>: The stored <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt" title="Template Class duration_fmt"><code class="computeroutput"><span class="identifier">duration_fmt</span></code></a> <code class="computeroutput"><span class="identifier">f</span></code>.
5456               </p>
5457 </div>
5458 <div class="section">
5459 <div class="titlepage"><div><div><h6 class="title">
5460 <a name="chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_out"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_out" title="Member Function operator &lt;&lt;(basic_ostream&lt;&gt;&amp;, duration_fmt)">Member
5461               Function <code class="computeroutput"><span class="keyword">operator</span> <span class="special">&lt;&lt;(</span><span class="identifier">basic_ostream</span><span class="special">&lt;&gt;&amp;,</span>
5462               <span class="identifier">duration_fmt</span><span class="special">)</span></code></a>
5463 </h6></div></div></div>
5464 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
5465   <span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5466   <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">duration_fmt</span> <span class="identifier">d</span><span class="special">);</span>
5467 </pre>
5468 <p>
5469                 <span class="bold"><strong>Effects:</strong></span>: <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_duration_style" title="Non Member Function set_duration_style(std::ios_base &amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_duration_style</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a><span class="special">&gt;(</span><span class="identifier">d</span><span class="special">))))</span></code>.
5470               </p>
5471 <p>
5472                 <span class="bold"><strong>Returns:</strong></span>: <code class="computeroutput"><span class="identifier">s</span></code>.
5473               </p>
5474 </div>
5475 <div class="section">
5476 <div class="titlepage"><div><div><h6 class="title">
5477 <a name="chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_in"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.duration_fmt.op_in" title="Member Function operator &gt;&gt;(basic_istream&lt;&gt;&amp;, duration_fmt)">Member
5478               Function <code class="computeroutput"><span class="keyword">operator</span> <span class="special">&gt;&gt;(</span><span class="identifier">basic_istream</span><span class="special">&lt;&gt;&amp;,</span>
5479               <span class="identifier">duration_fmt</span><span class="special">)</span></code></a>
5480 </h6></div></div></div>
5481 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">&gt;</span>
5482   <span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5483   <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">duration_fmt</span> <span class="identifier">d</span><span class="special">);</span>
5484 </pre>
5485 <p>
5486                 <span class="bold"><strong>Effects:</strong></span>: <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_duration_style" title="Non Member Function set_duration_style(std::ios_base &amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_duration_style</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a><span class="special">&gt;(</span><span class="identifier">d</span><span class="special">))))</span></code>.
5487               </p>
5488 <p>
5489                 <span class="bold"><strong>Returns:</strong></span>: <code class="computeroutput"><span class="identifier">s</span></code>.
5490               </p>
5491 </div>
5492 </div>
5493 <div class="section">
5494 <div class="titlepage"><div><div><h6 class="title">
5495 <a name="chrono.reference.io.duration_io_hpp.manipulators.symbol_format"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.symbol_format" title="Non Member Function symbol_format(ios_base&amp;)">Non
5496             Member Function <code class="computeroutput"><span class="identifier">symbol_format</span><span class="special">(</span><span class="identifier">ios_base</span><span class="special">&amp;)</span></code></a>
5497 </h6></div></div></div>
5498 <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.symbol_format" title="Non Member Function symbol_format(ios_base&amp;)"><code class="computeroutput"><span class="identifier">symbol_format</span></code></a><span class="special">(</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
5499 </pre>
5500 <p>
5501               <span class="bold"><strong>Effects:</strong></span>: <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_duration_style" title="Non Member Function set_duration_style(std::ios_base &amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_duration_style</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a><span class="special">::</span><span class="identifier">symbol</span><span class="special">)</span></code>.
5502             </p>
5503 <p>
5504               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">ios</span></code>
5505             </p>
5506 </div>
5507 <div class="section">
5508 <div class="titlepage"><div><div><h6 class="title">
5509 <a name="chrono.reference.io.duration_io_hpp.manipulators.name_format"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.name_format" title="Non Member Function name_format(ios_base&amp;)">Non
5510             Member Function <code class="computeroutput"><span class="identifier">name_format</span><span class="special">(</span><span class="identifier">ios_base</span><span class="special">&amp;)</span></code></a>
5511 </h6></div></div></div>
5512 <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.manipulators.name_format" title="Non Member Function name_format(ios_base&amp;)"><code class="computeroutput"><span class="identifier">name_format</span></code></a><span class="special">(</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
5513 </pre>
5514 <p>
5515               <span class="bold"><strong>Effects:</strong></span>: <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_duration_style" title="Non Member Function set_duration_style(std::ios_base &amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_duration_style</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.io.duration_style_hpp.duration_style" title="Scoped enum duration_style"><code class="computeroutput"><span class="identifier">duration_style</span></code></a><span class="special">::</span><span class="identifier">prefix</span><span class="special">)</span></code>.
5516             </p>
5517 <p>
5518               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">ios</span></code>
5519             </p>
5520 </div>
5521 </div>
5522 <div class="section">
5523 <div class="titlepage"><div><div><h5 class="title">
5524 <a name="chrono.reference.io.duration_io_hpp.streams"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.streams" title="I/O Streams Operations">I/O
5525           Streams Operations</a>
5526 </h5></div></div></div>
5527 <div class="section">
5528 <div class="titlepage"><div><div><h6 class="title">
5529 <a name="chrono.reference.io.duration_io_hpp.streams.duration__op_out"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.streams.duration__op_out" title="Member Function operator &lt;&lt;(basic_ostream&lt;&gt;&amp;, const duration&lt;&gt;&amp; d)">Member
5530             Function <code class="computeroutput"><span class="keyword">operator</span> <span class="special">&lt;&lt;(</span><span class="identifier">basic_ostream</span><span class="special">&lt;&gt;&amp;,</span>
5531             <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span></code></a>
5532 </h6></div></div></div>
5533 <p>
5534               Any <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> can be streamed out
5535               to a <code class="computeroutput"><span class="identifier">basic_ostream</span></code>.
5536               The run-time value of the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a> is formatted according
5537               to the rules and current format settings for <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><code class="computeroutput"><span class="special">::</span><span class="identifier">rep</span></code> and the <a class="link" href="reference.html#chrono.reference.io.duration_units_hpp.duration_units" title="Template Class duration_units"><code class="computeroutput"><span class="identifier">duration_units</span></code></a> facet.
5538             </p>
5539 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
5540     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5541     <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
5542 </pre>
5543 <p>
5544               <span class="bold"><strong>Effects:</strong></span> Behaves as a formatted output
5545               function. After constructing a sentry object, if the sentry converts
5546               to true, calls to <code class="computeroutput"><span class="identifier">facet</span><span class="special">.</span><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put.put" title="Member Function put(iter_type,std::ios_base&amp;,char_type,duration&lt;Rep,Period&gt; const&amp;, const CharT*,const CharT*)"><code class="computeroutput"><span class="identifier">put</span></code></a><span class="special">(</span><span class="identifier">os</span><span class="special">,</span><span class="identifier">os</span><span class="special">,</span><span class="identifier">os</span><span class="special">.</span><span class="identifier">fill</span><span class="special">(),</span><span class="identifier">d</span><span class="special">)</span></code>
5547               where <code class="computeroutput"><span class="identifier">facet</span></code> is the
5548               <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
5549               facet associated to <code class="computeroutput"><span class="identifier">os</span></code>
5550               or a new created instance of the default <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
5551               facet.
5552             </p>
5553 <p>
5554               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">os</span></code>.
5555             </p>
5556 </div>
5557 <div class="section">
5558 <div class="titlepage"><div><div><h6 class="title">
5559 <a name="chrono.reference.io.duration_io_hpp.streams.duration__op_in"></a><a class="link" href="reference.html#chrono.reference.io.duration_io_hpp.streams.duration__op_in" title="Member Function operator &lt;&lt;(basic_istream&lt;&gt;&amp;, const duration&lt;&gt;&amp; d)">Member
5560             Function <code class="computeroutput"><span class="keyword">operator</span> <span class="special">&lt;&lt;(</span><span class="identifier">basic_istream</span><span class="special">&lt;&gt;&amp;,</span>
5561             <span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span></code></a>
5562 </h6></div></div></div>
5563 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
5564     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
5565     <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span>
5566 </pre>
5567 <p>
5568               <span class="bold"><strong>Effects:</strong></span> Behaves as a formatted input
5569               function. After constructing a <code class="computeroutput"><span class="identifier">sentry</span></code>
5570               object, if the <code class="computeroutput"><span class="identifier">sentry</span></code>
5571               converts to <code class="computeroutput"><span class="keyword">true</span></code>, calls
5572               to <code class="computeroutput"><span class="identifier">facet</span><span class="special">.</span><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get.get" title="Template Member Function get(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,duration&lt;Rep,Period&gt;&amp;,const char_type*, const char_type*) const"><code class="computeroutput"><span class="identifier">get</span></code></a><span class="special">(</span><span class="identifier">is</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span>
5573               <span class="identifier">Traits</span><span class="special">&gt;(),</span>
5574               <span class="identifier">is</span><span class="special">,</span>
5575               <span class="identifier">err</span><span class="special">,</span>
5576               <span class="identifier">d</span><span class="special">)</span></code>
5577               where <code class="computeroutput"><span class="identifier">facet</span></code> is the
5578               <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get"><code class="computeroutput"><span class="identifier">duration_get</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
5579               facet associated to <code class="computeroutput"><span class="identifier">is</span></code>
5580               or a new created instance of the default <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.duration_get_hpp.duration_get" title="Template Class duration_get"><code class="computeroutput"><span class="identifier">duration_get</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
5581               facet.
5582             </p>
5583 <p>
5584               If any step fails, calls <code class="computeroutput"><span class="identifier">os</span><span class="special">.</span><span class="identifier">setstate</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span>
5585               <span class="special">|</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">badbit</span><span class="special">)</span></code>.
5586             </p>
5587 <p>
5588               <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">is</span></code>
5589             </p>
5590 </div>
5591 </div>
5592 </div>
5593 <div class="section">
5594 <div class="titlepage"><div><div><h4 class="title">
5595 <a name="chrono.reference.io.time_point_get_hpp"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp" title="Header &lt;boost/chrono/io/time_point_get.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_get</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
5596 </h4></div></div></div>
5597 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get">Template
5598           Class <code class="computeroutput"><span class="identifier">time_point_get</span></code></a></span></dt></dl></div>
5599 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
5600   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
5601     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">InputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
5602     <span class="keyword">class</span> <span class="identifier">time_point_get</span><span class="special">;</span>
5603   <span class="special">}</span>
5604 <span class="special">}</span>
5605 </pre>
5606 <div class="section">
5607 <div class="titlepage"><div><div><h5 class="title">
5608 <a name="chrono.reference.io.time_point_get_hpp.time_point_get"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get" title="Template Class time_point_get">Template
5609           Class <code class="computeroutput"><span class="identifier">time_point_get</span></code></a>
5610 </h5></div></div></div>
5611 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">InputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
5612 <span class="keyword">class</span> <span class="identifier">time_point_get</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">facet</span>
5613 <span class="special">{</span>
5614 <span class="keyword">public</span><span class="special">:</span>
5615   <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span> <span class="comment">// Type of character the facet is instantiated on.</span>
5616   <span class="keyword">typedef</span> <span class="identifier">InputIterator</span> <span class="identifier">iter_type</span><span class="special">;</span> <span class="comment">// Type of iterator used to scan the character buffer.</span>
5617
5618   <span class="keyword">explicit</span> <span class="identifier">__time_point_get_c</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
5619
5620   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
5621   <span class="identifier">iter_type</span> <span class="identifier">__time_point_get_get</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
5622       <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="special">&amp;</span><span class="identifier">tp</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="identifier">pattern</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="identifier">pat_end</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5623
5624   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
5625   <span class="identifier">iter_type</span> <span class="identifier">__time_point_get_get2</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
5626       <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="special">&amp;</span><span class="identifier">tp</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5627
5628   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
5629   <span class="identifier">iter_type</span> <span class="identifier">__time_point_get_get_duration</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
5630       <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5631
5632   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">&gt;</span>
5633   <span class="identifier">iter_type</span> <span class="identifier">__time_point_get_get_epoch</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5634
5635   <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> <span class="comment">// Unique identifier for this type of facet.</span>
5636
5637   <span class="identifier">__time_point_get_d</span><span class="special">();</span>
5638 <span class="special">};</span>
5639 </pre>
5640 <p>
5641             <code class="computeroutput"><span class="identifier">time_point_get</span></code> is used
5642             to parse a character sequence, extracting the duration and the epoch
5643             into a class <code class="computeroutput"><span class="identifier">time_point</span></code>.
5644           </p>
5645 <p>
5646             The pattern can contain the format specifiers <code class="computeroutput"><span class="special">%</span><span class="identifier">d</span></code> and <code class="computeroutput"><span class="special">%</span><span class="identifier">e</span></code> in any order.
5647           </p>
5648 <p>
5649             User confirmation is required for reliable parsing of user-entered durations,
5650             but machine-generated formats can be parsed reliably. This allows parsers
5651             to be aggressive about interpreting user variations on standard formats.
5652           </p>
5653 <p>
5654             If the end iterator is reached during parsing the member function sets
5655             <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">eofbit</span></code> in <code class="computeroutput"><span class="identifier">err</span></code>.
5656           </p>
5657 <div class="section">
5658 <div class="titlepage"><div><div><h6 class="title">
5659 <a name="chrono.reference.io.time_point_get_hpp.time_point_get.c"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get.c" title="Constructor time_point_get(size_t)">Constructor
5660             <code class="computeroutput"><span class="identifier">time_point_get</span><span class="special">(</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
5661 </h6></div></div></div>
5662 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">time_point_get</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span><span class="special">);</span>
5663 </pre>
5664 <p>
5665               Constructs a __time_point_get facet.
5666             </p>
5667 <p>
5668               <span class="bold"><strong>Parameters:</strong></span>
5669             </p>
5670 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
5671                   <span class="bold"><strong>refs:</strong></span> references
5672                 </li></ul></div>
5673 <p>
5674               <span class="bold"><strong>Effects:</strong></span> Constructs a <a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a> facet. If the
5675               <code class="computeroutput"><span class="identifier">refs</span></code> argument is <code class="computeroutput"><span class="number">0</span></code> then destruction of the object is delegated
5676               to the locale, or locales, containing it. This allows the user to ignore
5677               lifetime management issues. On the other had, if <code class="computeroutput"><span class="identifier">refs</span></code>
5678               is <code class="computeroutput"><span class="number">1</span></code> then the object must
5679               be explicitly deleted; <code class="computeroutput"><span class="identifier">locale</span></code>
5680               will not do so. In this case, the object can be maintained across the
5681               lifetime of multiple locales.
5682             </p>
5683 </div>
5684 <div class="section">
5685 <div class="titlepage"><div><div><h6 class="title">
5686 <a name="chrono.reference.io.time_point_get_hpp.time_point_get.d"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get.d" title="Destructor ~time_point_get()">Destructor
5687             <code class="computeroutput"><span class="special">~</span><span class="identifier">time_point_get</span><span class="special">()</span></code></a>
5688 </h6></div></div></div>
5689 <pre class="programlisting"><span class="special">~</span><span class="identifier">time_point_get</span><span class="special">();</span>
5690 </pre>
5691 <p>
5692               <span class="bold"><strong>Effects:</strong></span> Destroy the facet.
5693             </p>
5694 </div>
5695 <div class="section">
5696 <div class="titlepage"><div><div><h6 class="title">
5697 <a name="chrono.reference.io.time_point_get_hpp.time_point_get.get"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get.get" title="Template Member Function get(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,time_point&lt;Clock, Duration&gt;&amp;,const CharT*,const CharT*)">Template
5698             Member Function <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;&amp;,</span><span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*,</span><span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*)</span></code></a>
5699 </h6></div></div></div>
5700 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
5701 <span class="identifier">iter_type</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
5702     <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="special">&amp;</span><span class="identifier">tp</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="identifier">pattern</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="identifier">pat_end</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5703 </pre>
5704 <p>
5705               <span class="bold"><strong>Parameters:</strong></span>
5706             </p>
5707 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5708 <li class="listitem">
5709                   <span class="bold"><strong>s:</strong></span> start input stream iterator
5710                 </li>
5711 <li class="listitem">
5712                   <span class="bold"><strong>end:</strong></span> end input stream iterator
5713                 </li>
5714 <li class="listitem">
5715                   <span class="bold"><strong>ios:</strong></span> a reference to a <code class="computeroutput"><span class="identifier">ios_base</span></code>
5716                 </li>
5717 <li class="listitem">
5718                   <span class="bold"><strong>err:</strong></span> the <code class="computeroutput"><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span></code>
5719                 </li>
5720 <li class="listitem">
5721                   <span class="bold"><strong>tp:</strong></span> the <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>
5722                 </li>
5723 <li class="listitem">
5724                   <span class="bold"><strong>pattern:</strong></span> begin of the formatting
5725                   pattern
5726                 </li>
5727 <li class="listitem">
5728                   <span class="bold"><strong>pat_end:</strong></span> end of the formatting
5729                   pattern
5730                 </li>
5731 </ul></div>
5732 <p>
5733               <span class="bold"><strong>Requires:</strong></span> <code class="computeroutput"><span class="special">[</span><span class="identifier">pattern</span><span class="special">,</span><span class="identifier">pat_end</span><span class="special">)</span></code>
5734               must be a valid range.
5735             </p>
5736 <p>
5737               <span class="bold"><strong>Effects:</strong></span>: The function starts by evaluating
5738               <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span>
5739               <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">goodbit</span></code>. It then enters a loop, reading
5740               zero or more characters from <code class="computeroutput"><span class="identifier">s</span></code>
5741               at each iteration. Unless otherwise specified below, the loop terminates
5742               when the first of the following conditions holds:
5743             </p>
5744 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5745 <li class="listitem">
5746                   The expression <code class="computeroutput"><span class="identifier">pattern</span>
5747                   <span class="special">==</span> <span class="identifier">pat_end</span></code>
5748                   evaluates to <code class="computeroutput"><span class="keyword">true</span></code>.
5749                 </li>
5750 <li class="listitem">
5751                   The expression <code class="computeroutput"><span class="identifier">err</span> <span class="special">==</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">goodbit</span></code>
5752                   evaluates to <code class="computeroutput"><span class="keyword">false</span></code>.
5753                 </li>
5754 <li class="listitem">
5755                   The expression <code class="computeroutput"><span class="identifier">s</span> <span class="special">==</span> <span class="identifier">end</span></code>
5756                   evaluates to <code class="computeroutput"><span class="keyword">true</span></code>,
5757                   in which case the function evaluates <code class="computeroutput"><span class="identifier">err</span>
5758                   <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">eofbit</span>
5759                   <span class="special">|</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>.
5760                 </li>
5761 <li class="listitem">
5762                   The next element of pattern is equal to <code class="computeroutput"><span class="char">'%'</span></code>,
5763                   followed by a conversion specifier character, the functions <code class="computeroutput"><span class="identifier">get_duration</span></code> or <code class="computeroutput"><span class="identifier">get_epoch</span></code> are called depending
5764                   on whether the format is <code class="computeroutput"><span class="char">'d'</span></code>
5765                   or <code class="computeroutput"><span class="char">'e'</span></code>. If the number
5766                   of elements in the range <code class="computeroutput"><span class="special">[</span><span class="identifier">pattern</span><span class="special">,</span><span class="identifier">pat_end</span><span class="special">)</span></code>
5767                   is not sufficient to unambiguously determine whether the conversion
5768                   specification is complete and valid, the function evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">|=</span>
5769                   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>. Otherwise, the function
5770                   evaluates <code class="computeroutput"><span class="identifier">s</span> <span class="special">=</span>
5771                   <span class="identifier">do_get</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span>
5772                   <span class="identifier">end</span><span class="special">,</span>
5773                   <span class="identifier">ios</span><span class="special">,</span>
5774                   <span class="identifier">err</span><span class="special">,</span>
5775                   <span class="identifier">d</span><span class="special">)</span></code>.
5776                   If <code class="computeroutput"><span class="identifier">err</span> <span class="special">==</span>
5777                   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">goodbit</span></code> holds after the evaluation
5778                   of the expression, the function increments pattern to point just
5779                   past the end of the conversion specification and continues looping.
5780                 </li>
5781 <li class="listitem">
5782                   The expression <code class="computeroutput"><span class="identifier">isspace</span><span class="special">(*</span><span class="identifier">pattern</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">())</span></code> evaluates to <code class="computeroutput"><span class="keyword">true</span></code>,
5783                   in which case the function first increments <code class="computeroutput"><span class="identifier">pattern</span></code>
5784                   until <code class="computeroutput"><span class="identifier">pattern</span> <span class="special">==</span> <span class="identifier">pat_end</span>
5785                   <span class="special">||</span> <span class="special">!</span><span class="identifier">isspace</span><span class="special">(*</span><span class="identifier">pattern</span><span class="special">,</span>
5786                   <span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">())</span></code>
5787                   evaluates to <code class="computeroutput"><span class="keyword">true</span></code>,
5788                   then advances <code class="computeroutput"><span class="identifier">s</span></code>
5789                   until <code class="computeroutput"><span class="identifier">s</span> <span class="special">==</span>
5790                   <span class="identifier">end</span> <span class="special">||</span>
5791                   <span class="special">!</span><span class="identifier">isspace</span><span class="special">(*</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">())</span></code> is <code class="computeroutput"><span class="keyword">true</span></code>,
5792                   and finally resumes looping.
5793                 </li>
5794 <li class="listitem">
5795                   The next character read from <code class="computeroutput"><span class="identifier">s</span></code>
5796                   matches the element pointed to by pattern in a case-insensitive
5797                   comparison, in which case the function evaluates <code class="computeroutput"><span class="special">++</span><span class="identifier">pattern</span></code>,
5798                   <code class="computeroutput"><span class="special">++</span><span class="identifier">s</span></code>
5799                   and continues looping. Otherwise, the function evaluates <code class="computeroutput"><span class="identifier">err</span> <span class="special">=</span>
5800                   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code>.
5801                 </li>
5802 </ul></div>
5803 <p>
5804               <span class="bold"><strong>Returns:</strong></span> An iterator pointing just
5805               beyond the last character that can be determined to be part of a valid
5806               time_point.
5807             </p>
5808 </div>
5809 <div class="section">
5810 <div class="titlepage"><div><div><h6 class="title">
5811 <a name="chrono.reference.io.time_point_get_hpp.time_point_get.get2"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get.get2" title="Template Member Function get(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,time_point&lt;Clock,Duration&gt;&amp;)">Template
5812             Member Function <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span><span class="identifier">Duration</span><span class="special">&gt;&amp;)</span></code></a>
5813 </h6></div></div></div>
5814 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
5815 <span class="identifier">iter_type</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
5816     <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="special">&amp;</span><span class="identifier">tp</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5817 </pre>
5818 <p>
5819               <span class="bold"><strong>Parameters:</strong></span>
5820             </p>
5821 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
5822 <li class="listitem">
5823                   <span class="bold"><strong>s:</strong></span> start input stream iterator
5824                 </li>
5825 <li class="listitem">
5826                   <span class="bold"><strong>end:</strong></span> end input stream iterator
5827                 </li>
5828 <li class="listitem">
5829                   <span class="bold"><strong>ios:</strong></span> a reference to a <code class="computeroutput"><span class="identifier">ios_base</span></code>
5830                 </li>
5831 <li class="listitem">
5832                   <span class="bold"><strong>err:</strong></span> the <code class="computeroutput"><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span></code>
5833                 </li>
5834 <li class="listitem">
5835                   <span class="bold"><strong>tp:</strong></span> the <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>
5836                 </li>
5837 </ul></div>
5838 <p>
5839               <span class="bold"><strong>Effects:</strong></span> Stores the duration pattern
5840               from the <code class="computeroutput"><span class="identifier">duration_unit</span></code>
5841               facet in let say <code class="computeroutput"><span class="identifier">str</span></code>.
5842               Last as if
5843             </p>
5844 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">d</span><span class="special">,</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">size</span><span class="special">());</span>
5845 </pre>
5846 <p>
5847               <span class="bold"><strong>Returns:</strong></span> An iterator pointing just
5848               beyond the last character that can be determined to be part of a valid
5849               name.
5850             </p>
5851 </div>
5852 <div class="section">
5853 <div class="titlepage"><div><div><h6 class="title">
5854 <a name="chrono.reference.io.time_point_get_hpp.time_point_get.get_duration"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get.get_duration" title="Template Member Function get_duration(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;,duration&lt;Rep,Period&gt;&amp;)">Template
5855             Member Function <code class="computeroutput"><span class="identifier">get_duration</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;,</span><span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span><span class="identifier">Period</span><span class="special">&gt;&amp;)</span></code></a>
5856 </h6></div></div></div>
5857 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
5858 <span class="identifier">iter_type</span> <span class="identifier">get_duration</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">,</span>
5859     <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5860 </pre>
5861 <p>
5862               <span class="bold"><strong>Effects:</strong></span> As if
5863             </p>
5864 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">facet</span><span class="special">.</span><span class="identifier">get</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">d</span><span class="special">);</span>
5865 </pre>
5866 <p>
5867               where <code class="computeroutput"><span class="identifier">facet</span></code> is either
5868               the <code class="computeroutput"><span class="identifier">duration_get</span></code> facet
5869               associated to the <code class="computeroutput"><span class="identifier">ios</span></code>
5870               or an instance of the default <code class="computeroutput"><span class="identifier">duration_get</span></code>
5871               facet.
5872             </p>
5873 <p>
5874               <span class="bold"><strong>Returns:</strong></span> An iterator pointing just
5875               beyond the last character that can be determined to be part of a valid
5876               duration.
5877             </p>
5878 </div>
5879 <div class="section">
5880 <div class="titlepage"><div><div><h6 class="title">
5881 <a name="chrono.reference.io.time_point_get_hpp.time_point_get.get_epoch"></a><a class="link" href="reference.html#chrono.reference.io.time_point_get_hpp.time_point_get.get_epoch" title="Template Member Function get_epoch(iter_type,iter_type,std::ios_base&amp;,std::ios_base::iostate&amp;)">Template
5882             Member Function <code class="computeroutput"><span class="identifier">get_epoch</span><span class="special">(</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">iter_type</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;)</span></code></a>
5883 </h6></div></div></div>
5884 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">&gt;</span>
5885 <span class="identifier">iter_type</span> <span class="identifier">get_epoch</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">iter_type</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">iostate</span><span class="special">&amp;</span> <span class="identifier">err</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5886 </pre>
5887 <p>
5888               <span class="bold"><strong>Effects:</strong></span> Let <code class="computeroutput"><span class="identifier">facet</span></code>
5889               be the <a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units" title="Template Class time_point_units"><code class="computeroutput"><span class="identifier">time_point_units</span></code></a> facet associated
5890               to <code class="computeroutput"><span class="identifier">ios</span></code> or a new instance
5891               of the default __time_point_units_default facet. Let <code class="computeroutput"><span class="identifier">epoch</span></code> be the epoch string associated
5892               to the <code class="computeroutput"><span class="identifier">Clock</span></code> using
5893               this facet. Scans <code class="computeroutput"><span class="identifier">s</span></code>
5894               to match <code class="computeroutput"><span class="identifier">epoch</span></code> or
5895               <code class="computeroutput"><span class="identifier">end</span></code> is reached.
5896             </p>
5897 <p>
5898               If not match before the <code class="computeroutput"><span class="identifier">end</span></code>
5899               is reached <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code> is set in <code class="computeroutput"><span class="identifier">err</span></code>.
5900               If <code class="computeroutput"><span class="identifier">end</span></code> is reached
5901               <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code> is set in <code class="computeroutput"><span class="identifier">err</span></code>.
5902             </p>
5903 <p>
5904               <span class="bold"><strong>Returns:</strong></span> An iterator pointing just
5905               beyond the last character that can be determined to be part of a epoch.
5906             </p>
5907 </div>
5908 </div>
5909 </div>
5910 <div class="section">
5911 <div class="titlepage"><div><div><h4 class="title">
5912 <a name="chrono.reference.io.time_point_put_hpp"></a><a class="link" href="reference.html#chrono.reference.io.time_point_put_hpp" title="Header &lt;boost/chrono/io/time_point_put.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_put</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
5913 </h4></div></div></div>
5914 <div class="toc"><dl class="toc"><dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_put_hpp.time_point_put">Template
5915           Class <code class="computeroutput"><span class="identifier">time_point_put</span></code></a></span></dt></dl></div>
5916 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
5917   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
5918     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OutputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
5919     <span class="keyword">class</span> <span class="identifier">time_point_put</span><span class="special">;</span>
5920   <span class="special">}</span>
5921 <span class="special">}</span>
5922 </pre>
5923 <div class="section">
5924 <div class="titlepage"><div><div><h5 class="title">
5925 <a name="chrono.reference.io.time_point_put_hpp.time_point_put"></a><a class="link" href="reference.html#chrono.reference.io.time_point_put_hpp.time_point_put" title="Template Class time_point_put">Template
5926           Class <code class="computeroutput"><span class="identifier">time_point_put</span></code></a>
5927 </h5></div></div></div>
5928 <p>
5929             The __time_point_put facet provides facilities for formatted output of
5930             <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> values. The member
5931             function of __time_point_put take a <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a> and format it into
5932             character string representation.
5933           </p>
5934 <p>
5935             tparam ChatT a character type tparam OutputIterator a model of <code class="computeroutput"><span class="identifier">OutputIterator</span></code>
5936           </p>
5937 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OutputIterator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
5938 <span class="keyword">class</span> <span class="identifier">time_point_put</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">facet</span>
5939 <span class="special">{</span>
5940 <span class="keyword">public</span><span class="special">:</span>
5941   <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span> <span class="comment">// Type of character the facet is instantiated on.</span>
5942   <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span> <span class="comment">// Type of character string passed to member functions.</span>
5943   <span class="keyword">typedef</span> <span class="identifier">OutputIterator</span> <span class="identifier">iter_type</span><span class="special">;</span> <span class="comment">// Type of iterator used to write in the character buffer.</span>
5944
5945   <span class="keyword">explicit</span> <span class="identifier">time_point_put</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
5946   <span class="special">~</span><span class="identifier">time_point_put</span><span class="special">();</span>
5947
5948   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
5949   <span class="identifier">iter_type</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">tp</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pattern</span><span class="special">,</span>
5950       <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pat_end</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5951   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
5952   <span class="identifier">iter_type</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">tp</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5953   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
5954   <span class="identifier">iter_type</span> <span class="identifier">put_duration</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5955   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">&gt;</span>
5956   <span class="identifier">iter_type</span> <span class="identifier">put_epoch</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">os</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5957
5958   <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> <span class="comment">// Unique identifier for this type of facet.</span>
5959
5960
5961 <span class="special">};</span>
5962 </pre>
5963 <div class="section">
5964 <div class="titlepage"><div><div><h6 class="title">
5965 <a name="chrono.reference.io.time_point_put_hpp.time_point_put.c"></a><a class="link" href="reference.html#chrono.reference.io.time_point_put_hpp.time_point_put.c" title="Constructor time_point_get(size_t)">Constructor
5966             <code class="computeroutput"><span class="identifier">time_point_get</span><span class="special">(</span><span class="identifier">size_t</span><span class="special">)</span></code></a>
5967 </h6></div></div></div>
5968 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">time_point_put</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
5969 </pre>
5970 <p>
5971               Construct a time_point_put facet.
5972             </p>
5973 <p>
5974               <span class="bold"><strong>Effects:</strong></span> Construct a time_point_put
5975               facet. If the <code class="computeroutput"><span class="identifier">refs</span></code>
5976               argument is <code class="computeroutput"><span class="number">0</span></code> then destruction
5977               of the object is delegated to the locale, or locales, containing it.
5978               This allows the user to ignore lifetime management issues. On the other
5979               had, if <code class="computeroutput"><span class="identifier">refs</span></code> is <code class="computeroutput"><span class="number">1</span></code> then the object must be explicitly
5980               deleted; the locale will not do so. In this case, the object can be
5981               maintained across the lifetime of multiple locales.
5982             </p>
5983 <p>
5984               <span class="bold"><strong>Parameters:</strong></span>
5985             </p>
5986 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
5987                   <span class="bold"><strong>refs:</strong></span> references
5988                 </li></ul></div>
5989 </div>
5990 <div class="section">
5991 <div class="titlepage"><div><div><h6 class="title">
5992 <a name="chrono.reference.io.time_point_put_hpp.time_point_put.put1"></a><a class="link" href="reference.html#chrono.reference.io.time_point_put_hpp.time_point_put.put1" title="Member Function put()">Member
5993             Function <code class="computeroutput"><span class="identifier">put</span><span class="special">()</span></code></a>
5994 </h6></div></div></div>
5995 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
5996 <span class="identifier">iter_type</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">tp</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pattern</span><span class="special">,</span>
5997     <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">pat_end</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
5998 </pre>
5999 <p>
6000               <span class="bold"><strong>Parameters:</strong></span>
6001             </p>
6002 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
6003 <li class="listitem">
6004                   <span class="bold"><strong>i:</strong></span> an output stream iterator
6005                 </li>
6006 <li class="listitem">
6007                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
6008                 </li>
6009 <li class="listitem">
6010                   <span class="bold"><strong>fill:</strong></span> the character used as filler
6011                 </li>
6012 <li class="listitem">
6013                   <span class="bold"><strong>tp:</strong></span> the <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>
6014                 </li>
6015 <li class="listitem">
6016                   <span class="bold"><strong>pattern:</strong></span> begin of the formatting
6017                   pattern
6018                 </li>
6019 <li class="listitem">
6020                   <span class="bold"><strong>pat_end:</strong></span> end of the formatting
6021                   pattern
6022                 </li>
6023 </ul></div>
6024 <p>
6025               <span class="bold"><strong>Effects:</strong></span> Steps through the sequence
6026               from <code class="computeroutput"><span class="identifier">pattern</span></code> to <code class="computeroutput"><span class="identifier">pat_end</span></code>, identifying characters that
6027               are part of a pattern sequence. Each character that is not part of
6028               a pattern sequence is written to <code class="computeroutput"><span class="identifier">s</span></code>
6029               immediately, and each pattern sequence, as it is identified, results
6030               in a call to __put_duration or __put_epoch; thus, pattern elements
6031               and other characters are interleaved in the output in the order in
6032               which they appear in the pattern. Pattern sequences are identified
6033               by converting each character <code class="computeroutput"><span class="identifier">c</span></code>
6034               to a <code class="computeroutput"><span class="keyword">char</span></code> value as if
6035               by <code class="computeroutput"><span class="identifier">ct</span><span class="special">.</span><span class="identifier">narrow</span><span class="special">(</span><span class="identifier">c</span><span class="special">,</span><span class="number">0</span><span class="special">)</span></code>, where
6036               <code class="computeroutput"><span class="identifier">ct</span></code> is a reference to
6037               <code class="computeroutput"><span class="identifier">ctype</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</span></code>
6038               obtained from <code class="computeroutput"><span class="identifier">ios</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">()</span></code>.
6039               The first character of each sequence is equal to <code class="computeroutput"><span class="char">'%'</span></code>,
6040               followed by a pattern specifier character spec, which can be <code class="computeroutput"><span class="char">'d'</span></code> for the duration value or <code class="computeroutput"><span class="char">'e'</span></code> for the epoch. For each valid pattern
6041               sequence identified, calls <code class="computeroutput"><span class="identifier">put_duration</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">tp</span><span class="special">.</span><span class="identifier">time_since_epoch</span><span class="special">())</span></code> or <code class="computeroutput"><span class="identifier">put_epoch</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">)</span></code>.
6042             </p>
6043 <p>
6044               <span class="bold"><strong>Returns:</strong></span> An iterator pointing immediately
6045               after the last character produced.
6046             </p>
6047 </div>
6048 <div class="section">
6049 <div class="titlepage"><div><div><h6 class="title">
6050 <a name="chrono.reference.io.time_point_put_hpp.time_point_put.put2"></a><a class="link" href="reference.html#chrono.reference.io.time_point_put_hpp.time_point_put.put2" title="Member Function put()">Member
6051             Function <code class="computeroutput"><span class="identifier">put</span><span class="special">()</span></code></a>
6052 </h6></div></div></div>
6053 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Duration</span><span class="special">&gt;</span>
6054 <span class="identifier">iter_type</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">tp</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6055 </pre>
6056 <p>
6057               <span class="bold"><strong>Parameters:</strong></span>
6058             </p>
6059 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
6060 <li class="listitem">
6061                   <span class="bold"><strong>i:</strong></span> an output stream iterator
6062                 </li>
6063 <li class="listitem">
6064                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
6065                 </li>
6066 <li class="listitem">
6067                   <span class="bold"><strong>fill:</strong></span> the character used as filler
6068                 </li>
6069 <li class="listitem">
6070                   <span class="bold"><strong>tp:</strong></span> the <a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a>
6071                 </li>
6072 <li class="listitem">
6073                   <span class="bold"><strong>tern:</strong></span> begin of the formatting
6074                   pattern
6075                 </li>
6076 <li class="listitem">
6077                   <span class="bold"><strong>pat_end:</strong></span> end of the formatting
6078                   pattern
6079                 </li>
6080 </ul></div>
6081 <p>
6082               <span class="bold"><strong>Effects:</strong></span> Stores the time_point pattern
6083               from the __time_point_unit facet in let say <code class="computeroutput"><span class="identifier">str</span></code>.
6084               Last as if
6085             </p>
6086 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">tp</span><span class="special">,</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">size</span><span class="special">());</span>
6087 </pre>
6088 <p>
6089               <span class="bold"><strong>Returns:</strong></span> An iterator pointing immediately
6090               after the last character produced.
6091             </p>
6092 </div>
6093 <div class="section">
6094 <div class="titlepage"><div><div><h6 class="title">
6095 <a name="chrono.reference.io.time_point_put_hpp.time_point_put.put_duration"></a><a class="link" href="reference.html#chrono.reference.io.time_point_put_hpp.time_point_put.put_duration" title="Member Function put_duration()">Member
6096             Function <code class="computeroutput"><span class="identifier">put_duration</span><span class="special">()</span></code></a>
6097 </h6></div></div></div>
6098 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Period</span><span class="special">&gt;</span>
6099 <span class="identifier">iter_type</span> <span class="identifier">put_duration</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">char_type</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6100 </pre>
6101 <p>
6102               <span class="bold"><strong>Parameters:</strong></span>
6103             </p>
6104 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
6105 <li class="listitem">
6106                   <span class="bold"><strong>i:</strong></span> an output stream iterator
6107                 </li>
6108 <li class="listitem">
6109                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
6110                 </li>
6111 <li class="listitem">
6112                   <span class="bold"><strong>fill:</strong></span> the character used as filler
6113                 </li>
6114 <li class="listitem">
6115                   <span class="bold"><strong>d:</strong></span> the <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a>
6116                 </li>
6117 </ul></div>
6118 <p>
6119               <span class="bold"><strong>Effects:</strong></span> As if <code class="computeroutput"><span class="identifier">facet</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">ios</span><span class="special">,</span> <span class="identifier">fill</span><span class="special">,</span> <span class="identifier">d</span><span class="special">)</span></code> where facet is the <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
6120               facet associated to the <code class="computeroutput"><span class="identifier">ios</span></code>
6121               or a new instance of <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.duration_put_hpp.duration_put" title="Template Class duration_put"><code class="computeroutput"><span class="identifier">duration_put</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>.
6122             </p>
6123 <p>
6124               <span class="bold"><strong>Returns:</strong></span> An iterator pointing immediately
6125               after the last character produced.
6126             </p>
6127 </div>
6128 <div class="section">
6129 <div class="titlepage"><div><div><h6 class="title">
6130 <a name="chrono.reference.io.time_point_put_hpp.time_point_put.put_epoch"></a><a class="link" href="reference.html#chrono.reference.io.time_point_put_hpp.time_point_put.put_epoch" title="Member Function put_epoch()">Member
6131             Function <code class="computeroutput"><span class="identifier">put_epoch</span><span class="special">()</span></code></a>
6132 </h6></div></div></div>
6133 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">&gt;</span>
6134 <span class="identifier">iter_type</span> <span class="identifier">put_epoch</span><span class="special">(</span><span class="identifier">iter_type</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">&amp;</span> <span class="identifier">os</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6135 </pre>
6136 <p>
6137               <span class="bold"><strong>Parameters:</strong></span>
6138             </p>
6139 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
6140 <li class="listitem">
6141                   <span class="bold"><strong>i:</strong></span> an output stream iterator
6142                 </li>
6143 <li class="listitem">
6144                   <span class="bold"><strong>ios:</strong></span> a reference to a ios_base
6145                 </li>
6146 </ul></div>
6147 <p>
6148               <span class="bold"><strong>Effects:</strong></span> As if
6149             </p>
6150 <pre class="programlisting"><span class="identifier">string_type</span> <span class="identifier">str</span> <span class="special">=</span> <span class="identifier">facet</span><span class="special">.</span><span class="keyword">template</span> <span class="identifier">get_epoch</span><span class="special">&lt;</span><span class="identifier">Clock</span><span class="special">&gt;();</span>
6151 <span class="identifier">s</span><span class="special">=</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">str</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">str</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">);</span>
6152 </pre>
6153 <p>
6154               where facet is the <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units" title="Template Class time_point_units"><code class="computeroutput"><span class="identifier">time_point_units</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
6155               facet associated to the <code class="computeroutput"><span class="identifier">ios</span></code>
6156               or a new instance of <code class="computeroutput"><span class="identifier">__time_point_units_default</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>.
6157             </p>
6158 <p>
6159               <span class="bold"><strong>Returns:</strong></span> s, iterator pointing immediately
6160               after the last character produced.
6161             </p>
6162 </div>
6163 </div>
6164 </div>
6165 <div class="section">
6166 <div class="titlepage"><div><div><h4 class="title">
6167 <a name="chrono.reference.io.time_point_units_hpp"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp" title="Header &lt;boost/chrono/io/time_point_units.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_units</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
6168 </h4></div></div></div>
6169 <div class="toc"><dl class="toc">
6170 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_units_hpp.get_epoch_custom">Template
6171           Function <code class="computeroutput"><span class="identifier">get_epoch_custom</span></code></a></span></dt>
6172 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units">Template
6173           Class <code class="computeroutput"><span class="identifier">time_point_units</span></code></a></span></dt>
6174 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units_default">Template
6175           Class <code class="computeroutput"><span class="identifier">time_point_units_default</span></code></a></span></dt>
6176 </dl></div>
6177 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
6178   <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
6179     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">TPUFacet</span><span class="special">&gt;</span>
6180     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">get_epoch_custom</span><span class="special">(</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">TPUFacet</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
6181     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">=</span><span class="keyword">char</span><span class="special">&gt;</span>
6182     <span class="keyword">class</span> <span class="identifier">time_point_units</span><span class="special">;</span>
6183     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">=</span><span class="keyword">char</span><span class="special">&gt;</span>
6184     <span class="keyword">class</span> <span class="identifier">time_point_units_default</span><span class="special">,</span>
6185   <span class="special">}</span>
6186 <span class="special">}</span>
6187 </pre>
6188 <div class="section">
6189 <div class="titlepage"><div><div><h5 class="title">
6190 <a name="chrono.reference.io.time_point_units_hpp.get_epoch_custom"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.get_epoch_custom" title="Template Function get_epoch_custom">Template
6191           Function <code class="computeroutput"><span class="identifier">get_epoch_custom</span></code></a>
6192 </h5></div></div></div>
6193 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">TPUFacet</span><span class="special">&gt;</span>
6194 <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">get_epoch_custom</span><span class="special">(</span><span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">TPUFacet</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
6195 </pre>
6196 <p>
6197             Customization point to the epoch associated to the clock <code class="computeroutput"><span class="identifier">Clock</span></code> The default calls <code class="computeroutput"><span class="identifier">f</span><span class="special">.</span><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">Clock</span><span class="special">())</span></code>.
6198           </p>
6199 <p>
6200             The user can overload this function.
6201           </p>
6202 <p>
6203             <span class="bold"><strong>Returns:</strong></span> Forwards the call to the facet
6204             as if
6205           </p>
6206 <pre class="programlisting"><span class="keyword">return</span> <span class="identifier">f</span><span class="special">.</span><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">Clock</span><span class="special">());</span>
6207 </pre>
6208 </div>
6209 <div class="section">
6210 <div class="titlepage"><div><div><h5 class="title">
6211 <a name="chrono.reference.io.time_point_units_hpp.time_point_units"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units" title="Template Class time_point_units">Template
6212           Class <code class="computeroutput"><span class="identifier">time_point_units</span></code></a>
6213 </h5></div></div></div>
6214 <p>
6215             <a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units" title="Template Class time_point_units"><code class="computeroutput"><span class="identifier">time_point_units</span></code></a> facet gives
6216             useful information about the time_point pattern, the text associated
6217             to a time_point's epoch,
6218           </p>
6219 <pre class="programlisting">  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">=</span><span class="keyword">char</span><span class="special">&gt;</span>
6220   <span class="keyword">class</span> <span class="identifier">time_point_units</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">facet</span>
6221   <span class="special">{</span>
6222   <span class="keyword">public</span><span class="special">:</span>
6223     <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span> <span class="comment">// Type of character the facet is instantiated on.</span>
6224     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span> <span class="comment">// Type of character string used by member functions.</span>
6225     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> <span class="comment">// Unique identifier for this type of facet.</span>
6226
6227     <span class="keyword">explicit</span> <span class="identifier">time_point_units</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
6228
6229     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">get_pattern</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">=</span><span class="number">0</span><span class="special">;</span>
6230     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">&gt;</span>
6231     <span class="identifier">string_type</span> <span class="identifier">get_epoch</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
6232
6233   <span class="keyword">protected</span><span class="special">:</span>
6234     <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">time_point_units</span><span class="special">();</span>
6235     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">system_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6236     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">steady_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6237
6238 <span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span><span class="special">)</span>
6239     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_real_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6240     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_user_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6241     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_system_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6242     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6243 <span class="preprocessor">#endif</span>
6244 <span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_THREAD_CLOCK</span><span class="special">)</span>
6245     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">thread_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6246 <span class="preprocessor">#endif</span>
6247
6248   <span class="special">};</span>
6249 </pre>
6250 <div class="section">
6251 <div class="titlepage"><div><div><h6 class="title">
6252 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.c"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.c" title="Constructor time_point_units()">Constructor
6253             <code class="computeroutput"><span class="identifier">time_point_units</span><span class="special">()</span></code></a>
6254 </h6></div></div></div>
6255 <pre class="programlisting"><span class="keyword">explicit</span> <span class="identifier">time_point_units</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
6256 </pre>
6257 <p>
6258               Construct a <a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units" title="Template Class time_point_units"><code class="computeroutput"><span class="identifier">time_point_units</span></code></a> facet.
6259             </p>
6260 <p>
6261               <span class="bold"><strong>Parameters:</strong></span>
6262             </p>
6263 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6264                   <span class="bold"><strong>refs:</strong></span> references
6265                 </li></ul></div>
6266 <p>
6267               <span class="bold"><strong>Effects:</strong></span> Construct a <a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units" title="Template Class time_point_units"><code class="computeroutput"><span class="identifier">time_point_units</span></code></a> facet. If
6268               the <code class="computeroutput"><span class="identifier">refs</span></code> argument is
6269               <code class="computeroutput"><span class="number">0</span></code> then destruction of the
6270               object is delegated to the locale, or locales, containing it. This
6271               allows the user to ignore lifetime management issues. On the other
6272               had, if <code class="computeroutput"><span class="identifier">refsv</span> <span class="identifier">is</span>
6273               </code>1` then the object must be explicitly deleted; the locale will
6274               not do so. In this case, the object can be maintained across the lifetime
6275               of multiple locales.
6276             </p>
6277 </div>
6278 <div class="section">
6279 <div class="titlepage"><div><div><h6 class="title">
6280 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.get_pattern"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.get_pattern" title="Member Function get_pattern()">Member
6281             Function <code class="computeroutput"><span class="identifier">get_pattern</span><span class="special">()</span></code></a>
6282 </h6></div></div></div>
6283 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">get_pattern</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">=</span><span class="number">0</span><span class="special">;</span>
6284 </pre>
6285 <p>
6286               <span class="bold"><strong>Returns:</strong></span> the pattern to be used by
6287               default.
6288             </p>
6289 </div>
6290 <div class="section">
6291 <div class="titlepage"><div><div><h6 class="title">
6292 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.get_epoch"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.get_epoch" title="Member Function get_epoch()">Member
6293             Function <code class="computeroutput"><span class="identifier">get_epoch</span><span class="special">()</span></code></a>
6294 </h6></div></div></div>
6295 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Clock</span><span class="special">&gt;</span>
6296 <span class="identifier">string_type</span> <span class="identifier">get_epoch</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
6297 </pre>
6298 <p>
6299               <span class="bold"><strong>Returns:</strong></span> the epoch associated to the
6300               clock <code class="computeroutput"><span class="identifier">Clock</span></code> as if
6301               <code class="computeroutput"><span class="keyword">return</span> <span class="identifier">get_epoch_custom</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;(</span><span class="identifier">Clock</span><span class="special">(),</span> <span class="special">*</span><span class="keyword">this</span><span class="special">);</span> </code>
6302             </p>
6303 </div>
6304 <div class="section">
6305 <div class="titlepage"><div><div><h6 class="title">
6306 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.d"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.d" title="Destructor time_point_units()">Destructor
6307             <code class="computeroutput"><span class="identifier">time_point_units</span><span class="special">()</span></code></a>
6308 </h6></div></div></div>
6309 <pre class="programlisting"><span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">time_point_units</span><span class="special">();</span>
6310 </pre>
6311 <p>
6312               Destroy the facet.
6313             </p>
6314 </div>
6315 <div class="section">
6316 <div class="titlepage"><div><div><h6 class="title">
6317 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_system_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_system_clock" title="Member Function do_get_epoch(system_clock)">Member
6318             Function <code class="computeroutput"><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">system_clock</span><span class="special">)</span></code></a>
6319 </h6></div></div></div>
6320 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">system_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6321 </pre>
6322 <p>
6323               <span class="bold"><strong>Parameters:</strong></span>
6324             </p>
6325 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6326                   <span class="bold"><strong>c:</strong></span> a dummy instance of <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a>.
6327                 </li></ul></div>
6328 <p>
6329               <span class="bold"><strong>Returns:</strong></span> The epoch string associated
6330               to the <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a>.
6331             </p>
6332 </div>
6333 <div class="section">
6334 <div class="titlepage"><div><div><h6 class="title">
6335 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_steady_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_steady_clock" title="Member Function do_get_epoch(steady_clock)">Member
6336             Function <code class="computeroutput"><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">steady_clock</span><span class="special">)</span></code></a>
6337 </h6></div></div></div>
6338 <pre class="programlisting"><span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">steady_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6339 </pre>
6340 <p>
6341               <span class="bold"><strong>Parameters:</strong></span>
6342             </p>
6343 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6344                   <span class="bold"><strong>c:</strong></span> a dummy instance of <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a>.
6345                 </li></ul></div>
6346 <p>
6347               <span class="bold"><strong>Returns:</strong></span> The epoch string associated
6348               to the <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a>.
6349             </p>
6350 </div>
6351 <div class="section">
6352 <div class="titlepage"><div><div><h6 class="title">
6353 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_real_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_real_cpu_clock" title="Member Function do_get_epoch(process_real_cpu_clock)">Member
6354             Function <code class="computeroutput"><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_real_cpu_clock</span><span class="special">)</span></code></a>
6355 </h6></div></div></div>
6356 <pre class="programlisting"><span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span><span class="special">)</span>
6357     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_real_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6358 <span class="preprocessor">#endif</span>
6359 </pre>
6360 <p>
6361               <span class="bold"><strong>Parameters:</strong></span>
6362             </p>
6363 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6364                   <span class="bold"><strong>c:</strong></span> a dummy instance of <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>.
6365                 </li></ul></div>
6366 <p>
6367               <span class="bold"><strong>Returns:</strong></span> The epoch string associated
6368               to the <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>.
6369             </p>
6370 </div>
6371 <div class="section">
6372 <div class="titlepage"><div><div><h6 class="title">
6373 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_user_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_user_cpu_clock" title="Member Function do_get_epoch(process_user_cpu_clock)">Member
6374             Function <code class="computeroutput"><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_user_cpu_clock</span><span class="special">)</span></code></a>
6375 </h6></div></div></div>
6376 <pre class="programlisting"><span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span><span class="special">)</span>
6377     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_user_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6378 <span class="preprocessor">#endif</span>
6379 </pre>
6380 <p>
6381               <span class="bold"><strong>Parameters:</strong></span>
6382             </p>
6383 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6384                   <span class="bold"><strong>c:</strong></span> a dummy instance of <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>.
6385                 </li></ul></div>
6386 <p>
6387               <span class="bold"><strong>Returns:</strong></span> The epoch string associated
6388               to the process_user_cpu_clock.
6389             </p>
6390 </div>
6391 <div class="section">
6392 <div class="titlepage"><div><div><h6 class="title">
6393 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_system_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_system_cpu_clock" title="Member Function do_get_epoch(process_system_cpu_clock)">Member
6394             Function <code class="computeroutput"><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_system_cpu_clock</span><span class="special">)</span></code></a>
6395 </h6></div></div></div>
6396 <pre class="programlisting"><span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span><span class="special">)</span>
6397     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_system_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6398 <span class="preprocessor">#endif</span>
6399 </pre>
6400 <p>
6401               <span class="bold"><strong>Parameters:</strong></span>
6402             </p>
6403 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6404                   <span class="bold"><strong>c:</strong></span> a dummy instance of <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a>.
6405                 </li></ul></div>
6406 <p>
6407               <span class="bold"><strong>Returns:</strong></span> The epoch string associated
6408               to the process_user_cpu_clock.
6409             </p>
6410 </div>
6411 <div class="section">
6412 <div class="titlepage"><div><div><h6 class="title">
6413 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_process_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_process_cpu_clock" title="Member Function do_get_epoch(process_cpu_clock)">Member
6414             Function <code class="computeroutput"><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_cpu_clock</span><span class="special">)</span></code></a>
6415 </h6></div></div></div>
6416 <pre class="programlisting"><span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span><span class="special">)</span>
6417     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_cpu_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6418 <span class="preprocessor">#endif</span>
6419 </pre>
6420 <p>
6421               <span class="bold"><strong>Parameters:</strong></span>
6422             </p>
6423 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6424                   <span class="bold"><strong>c:</strong></span> a dummy instance of <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock" title="Class process_cpu_clock"><code class="computeroutput"><span class="identifier">process_cpu_clock</span></code></a>.
6425                 </li></ul></div>
6426 <p>
6427               <span class="bold"><strong>Returns:</strong></span> The epoch string associated
6428               to the process_cpu_clock.
6429             </p>
6430 </div>
6431 <div class="section">
6432 <div class="titlepage"><div><div><h6 class="title">
6433 <a name="chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_thread_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units.do_get_epoch_process_thread_clock" title="Member Function do_get_epoch(thread_clock)">Member
6434             Function <code class="computeroutput"><span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">thread_clock</span><span class="special">)</span></code></a>
6435 </h6></div></div></div>
6436 <pre class="programlisting"><span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_THREAD_CLOCK</span><span class="special">)</span>
6437     <span class="keyword">virtual</span> <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">thread_clock</span><span class="special">)</span> <span class="keyword">const</span><span class="special">=</span><span class="number">0</span><span class="special">;</span>
6438 <span class="preprocessor">#endif</span>
6439 </pre>
6440 <p>
6441               <span class="bold"><strong>Parameters:</strong></span>
6442             </p>
6443 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
6444                   <span class="bold"><strong>c:</strong></span> a dummy instance of <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a>.
6445                 </li></ul></div>
6446 <p>
6447               <span class="bold"><strong>Returns:</strong></span> The epoch string associated
6448               to the <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a>.
6449             </p>
6450 </div>
6451 </div>
6452 <div class="section">
6453 <div class="titlepage"><div><div><h5 class="title">
6454 <a name="chrono.reference.io.time_point_units_hpp.time_point_units_default"></a><a class="link" href="reference.html#chrono.reference.io.time_point_units_hpp.time_point_units_default" title="Template Class time_point_units_default">Template
6455           Class <code class="computeroutput"><span class="identifier">time_point_units_default</span></code></a>
6456 </h5></div></div></div>
6457 <pre class="programlisting">  <span class="comment">// This class is used to define the strings for the default English</span>
6458   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span><span class="special">=</span><span class="keyword">char</span><span class="special">&gt;</span>
6459   <span class="keyword">class</span> <span class="identifier">time_point_units_default</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">time_point_units</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span>
6460   <span class="special">{</span>
6461   <span class="keyword">public</span><span class="special">:</span>
6462     <span class="keyword">typedef</span> <span class="identifier">CharT</span> <span class="identifier">char_type</span><span class="special">;</span> <span class="comment">// Type of character the facet is instantiated on.</span>
6463     <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span> <span class="identifier">string_type</span><span class="special">;</span> <span class="comment">// Type of character string used by member functions.</span>
6464
6465     <span class="keyword">explicit</span> <span class="identifier">time_point_units_default</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">refs</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
6466     <span class="special">~</span><span class="identifier">time_point_units_default</span><span class="special">();</span>
6467
6468     <span class="comment">/**
6469      * __returns the default pattern "%d%e".
6470      */</span>
6471     <span class="identifier">string_type</span> <span class="identifier">get_pattern</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
6472
6473   <span class="keyword">protected</span><span class="special">:</span>
6474     <span class="comment">/**
6475      * [param c a dummy instance of __system_clock.
6476      * __returns The epoch string returned by `clock_string&lt;system_clock,CharT&gt;::since()`.
6477      */</span>
6478     <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">system_clock</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6479     <span class="comment">/**
6480      * [param c a dummy instance of __steady_clock.
6481      * __returns The epoch string returned by `clock_string&lt;steady_clock,CharT&gt;::since()`.
6482      */</span>
6483     <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">steady_clock</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6484 <span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span><span class="special">)</span>
6485     <span class="comment">/**
6486      * [param c a dummy instance of __process_real_cpu_clock.
6487      * __returns The epoch string returned by `clock_string&lt;process_real_cpu_clock,CharT&gt;::since()`.
6488      */</span>
6489     <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_real_cpu_clock</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6490     <span class="comment">/**
6491      * [param c a dummy instance of __process_user_cpu_clock.
6492      * __returns The epoch string returned by `clock_string&lt;process_user_cpu_clock,CharT&gt;::since()`.
6493      */</span>
6494     <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_user_cpu_clock</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6495     <span class="comment">/**
6496      * [param c a dummy instance of __process_system_cpu_clock.
6497      * __returns The epoch string returned by `clock_string&lt;process_system_cpu_clock,CharT&gt;::since()`.
6498      */</span>
6499     <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_system_cpu_clock</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6500     <span class="comment">/**
6501      * [param c a dummy instance of __process_cpu_clock.
6502      * __returns The epoch string returned by `clock_string&lt;process_cpu_clock,CharT&gt;::since()`.
6503      */</span>
6504     <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">process_cpu_clock</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6505
6506 <span class="preprocessor">#endif</span>
6507 <span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_THREAD_CLOCK</span><span class="special">)</span>
6508     <span class="comment">/**
6509      * [param c a dummy instance of __thread_clock.
6510      * __returns The epoch string returned by `clock_string&lt;thread_clock,CharT&gt;::since()`.
6511      */</span>
6512     <span class="identifier">string_type</span> <span class="identifier">do_get_epoch</span><span class="special">(</span><span class="identifier">thread_clock</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
6513 <span class="preprocessor">#endif</span>
6514
6515   <span class="special">};</span>
6516 </pre>
6517 </div>
6518 </div>
6519 <div class="section">
6520 <div class="titlepage"><div><div><h4 class="title">
6521 <a name="chrono.reference.io.time_point_io_hpp"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp" title="Header &lt;boost/chrono/io/time_point_io.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">io</span><span class="special">/</span><span class="identifier">time_point_io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
6522 </h4></div></div></div>
6523 <div class="toc"><dl class="toc">
6524 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_io_hpp.manip">I/O
6525           Manipulators</a></span></dt>
6526 <dt><span class="section"><a href="reference.html#chrono.reference.io.time_point_io_hpp.streams">I/O
6527           Streams Operations</a></span></dt>
6528 </dl></div>
6529 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
6530 <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
6531
6532
6533     <span class="comment">// manipulators</span>
6534
6535     <span class="identifier">unspecified</span> <a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.manip.time_fmt1" title="Non Member Function time_fmt(timezone)"><code class="computeroutput"><span class="identifier">time_fmt</span></code></a><span class="special">(</span><span class="identifier">timezone</span> <span class="identifier">tz</span><span class="special">);</span>
6536     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
6537     <span class="identifier">unspecified</span> <a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.manip.time_fmt2" title="Non Member Function time_fmt(timezone, string)"><code class="computeroutput"><span class="identifier">time_fmt</span></code></a><span class="special">(</span><span class="identifier">timezone</span> <span class="identifier">tz</span><span class="special">,</span> <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">f</span><span class="special">);</span>
6538     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
6539     <span class="identifier">unspecified</span> <a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.manip.time_fmt2" title="Non Member Function time_fmt(timezone, string)"><code class="computeroutput"><span class="identifier">time_fmt</span></code></a><span class="special">(</span><span class="identifier">timezone</span> <span class="identifier">tz</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">f</span><span class="special">);</span>
6540
6541     <span class="comment">// i/o state savers</span>
6542
6543     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Traits</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
6544     <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver" title="Template Class timezone_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a>
6545     <span class="special">{</span>
6546       <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ios</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span> <span class="identifier">state_type</span><span class="special">;</span>
6547       <span class="keyword">typedef</span> <span class="identifier">timezone</span> <span class="identifier">aspect_type</span><span class="special">;</span>
6548
6549       <span class="keyword">explicit</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c1" title="Constructor timezone_io_saver(state_type&amp;)"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
6550       <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.c2" title="Constructor timezone_io_saver(state_type&amp;, aspect_type)"><code class="computeroutput"><span class="identifier">timezone_io_saver</span></code></a><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">aspect_type</span> <span class="identifier">new_value</span><span class="special">);</span>
6551       <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.timezone_io_saver.d" title="Destructor ~timezone_io_saver()"><code class="computeroutput"><span class="special">~</span><span class="identifier">timezone_io_saver</span></code></a><span class="special">();</span>
6552       <span class="keyword">void</span> <span class="identifier">timezone_io_saver__restore</span><span class="special">();</span>
6553     <span class="special">};</span>
6554
6555     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CharT</span> <span class="special">=</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Traits</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span>
6556     <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.ioss.time_fmt_io_saver" title="Template Class time_fmt_io_saver&lt;&gt;"><code class="computeroutput"><span class="identifier">time_fmt_io_saver</span></code></a>
6557     <span class="special">{</span>
6558       <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ios</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span> <span class="identifier">state_type</span><span class="special">;</span>
6559
6560       <span class="keyword">explicit</span> <span class="identifier">time_fmt_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">);</span>
6561       <span class="identifier">time_fmt_io_saver</span><span class="special">(</span><span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">new_value</span><span class="special">);</span>
6562       <span class="special">~</span> <span class="identifier">time_fmt_io_saver</span><span class="special">();</span>
6563       <span class="keyword">void</span> <span class="identifier">restore</span><span class="special">();</span>
6564     <span class="special">};</span>
6565
6566     <span class="comment">// system_clock I/O</span>
6567
6568     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6569       <span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6570       <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
6571                  <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6572
6573     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6574       <span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6575       <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
6576                  <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6577
6578     <span class="comment">// Other Clocks I/O</span>
6579
6580     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6581         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6582         <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
6583                <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6584
6585     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6586         <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6587         <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
6588                <span class="identifier">time_point</span><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6589
6590 <span class="special">}</span>
6591 <span class="special">}</span>
6592 </pre>
6593 <div class="section">
6594 <div class="titlepage"><div><div><h5 class="title">
6595 <a name="chrono.reference.io.time_point_io_hpp.manip"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.manip" title="I/O Manipulators">I/O
6596           Manipulators</a>
6597 </h5></div></div></div>
6598 <div class="section">
6599 <div class="titlepage"><div><div><h6 class="title">
6600 <a name="chrono.reference.io.time_point_io_hpp.manip.time_fmt1"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.manip.time_fmt1" title="Non Member Function time_fmt(timezone)">Non
6601             Member Function <span class="identifier">time_fmt</span><span class="special">(</span><code class="computeroutput"><span class="identifier">timezone</span></code><span class="special">)</span>
6602             </a>
6603 </h6></div></div></div>
6604 <pre class="programlisting"><span class="identifier">unspecified</span> <span class="identifier">time_fmt</span><span class="special">(</span><a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> <span class="identifier">tz</span><span class="special">);</span>
6605 </pre>
6606 <p>
6607               <span class="bold"><strong>Returns:</strong></span>: An unspecified object that
6608               when streamed to a <code class="computeroutput"><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code> or <code class="computeroutput"><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code> <code class="computeroutput"><span class="identifier">s</span></code>
6609               will have the effects of:
6610             </p>
6611 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_timezone" title="Non Member Function set_timezone(std::ios_base&amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_timezone</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">tz</span><span class="special">);</span>
6612 </pre>
6613 </div>
6614 <div class="section">
6615 <div class="titlepage"><div><div><h6 class="title">
6616 <a name="chrono.reference.io.time_point_io_hpp.manip.time_fmt2"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.manip.time_fmt2" title="Non Member Function time_fmt(timezone, string)">Non
6617             Member Function <span class="identifier">time_fmt</span><span class="special">(</span><code class="computeroutput"><span class="identifier">timezone</span></code><span class="special">,</span>
6618             <span class="identifier">string</span><span class="special">)</span>
6619             </a>
6620 </h6></div></div></div>
6621 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
6622   <span class="identifier">unspecified</span> <span class="identifier">time_fmt</span><span class="special">(</span><span class="identifier">timezone</span> <span class="identifier">tz</span><span class="special">,</span> <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">f</span><span class="special">);</span>
6623 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
6624   <span class="identifier">unspecified</span> <span class="identifier">time_fmt</span><span class="special">(</span><span class="identifier">timezone</span> <span class="identifier">tz</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span> <span class="identifier">f</span><span class="special">);</span>
6625 </pre>
6626 <p>
6627               <span class="bold"><strong>Returns:</strong></span>: An unspecified object that
6628               when streamed to a <code class="computeroutput"><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code> or <code class="computeroutput"><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code> <code class="computeroutput"><span class="identifier">s</span></code>
6629               will have the effects of:
6630             </p>
6631 <pre class="programlisting"><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_timezone" title="Non Member Function set_timezone(std::ios_base&amp;,duration_style)"><code class="computeroutput"><span class="identifier">set_timezone</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">tz</span><span class="special">);</span>
6632 <a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.set_time_fmt" title="Non Member Function set_time_fmt(std::ios_base&amp;, std::basic_string&lt;CharT&gt; const&amp;)"><code class="computeroutput"><span class="identifier">set_time_fmt</span></code></a><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
6633 </pre>
6634 </div>
6635 </div>
6636 <div class="section">
6637 <div class="titlepage"><div><div><h5 class="title">
6638 <a name="chrono.reference.io.time_point_io_hpp.streams"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.streams" title="I/O Streams Operations">I/O
6639           Streams Operations</a>
6640 </h5></div></div></div>
6641 <div class="section">
6642 <div class="titlepage"><div><div><h6 class="title">
6643 <a name="chrono.reference.io.time_point_io_hpp.streams.system_clock"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.streams.system_clock" title="system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a>
6644 </h6></div></div></div>
6645 <div class="section">
6646 <div class="titlepage"><div><div><h6 class="title">
6647 <a name="chrono.reference.io.time_point_io_hpp.streams.system_clock.op_out"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.streams.system_clock.op_out" title="Non Member Function operator&lt;&lt;()">Non
6648               Member Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;()</span></code></a>
6649 </h6></div></div></div>
6650 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6651     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6652     <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
6653            <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6654 </pre>
6655 <p>
6656                 <span class="bold"><strong>Effects:</strong></span> Behaves as a formatted
6657                 output function. After constructing a <code class="computeroutput"><span class="identifier">sentry</span></code>
6658                 object, if the <code class="computeroutput"><span class="identifier">sentry</span></code>
6659                 converts to <code class="computeroutput"><span class="keyword">true</span></code>, sets
6660                 a local variable <code class="computeroutput"><span class="identifier">tz</span></code>
6661                 of type <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> to <code class="computeroutput"><span class="identifier">get_timezone</span><span class="special">(</span><span class="identifier">os</span><span class="special">)</span></code>.
6662                 Additionally the format string obtained with <code class="computeroutput"><a class="link" href="reference.html#chrono.reference.io.ios_state_hpp.sag.get_time_fmt" title="Non Member Function get_time_fmt(std::ios_base &amp;)"><code class="computeroutput"><span class="identifier">get_time_fmt</span></code></a><span class="special">()</span></code>
6663                 is recorded as a pair of <code class="computeroutput"><span class="keyword">const</span>
6664                 <span class="identifier">CharT</span><span class="special">*</span></code>.
6665                 If the stream has no time_punct facet, then this pair of <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">CharT</span><span class="special">*</span></code> that represent an empty range.
6666               </p>
6667 <p>
6668                 Next <code class="computeroutput"><span class="identifier">tp</span></code> is converted
6669                 to a <code class="computeroutput"><span class="identifier">time_t</span></code>, and
6670                 this <code class="computeroutput"><span class="identifier">time_t</span></code> is converted
6671                 to a <code class="computeroutput"><span class="identifier">tm</span></code>. The conversion
6672                 to <code class="computeroutput"><span class="identifier">tm</span></code> use <code class="computeroutput"><span class="identifier">gmtime</span></code> (when available) if the
6673                 timezone is <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">utc</span></code></a>, else it use localtime
6674                 (if available).
6675               </p>
6676 <p>
6677                 Using the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">time_put</span></code> facet stored in <code class="computeroutput"><span class="identifier">os</span></code>, this inserter writes characters
6678                 to the stream using the <code class="computeroutput"><span class="identifier">tm</span></code>
6679                 and the formatting string stored in the <code class="computeroutput"><span class="identifier">time_punct</span></code>
6680                 facet, unless that facet was missing, or unless it provided an empty
6681                 string.
6682               </p>
6683 <p>
6684                 If the formatting string is empty, then output as follows:
6685               </p>
6686 <p>
6687                 First output <code class="computeroutput"><span class="identifier">tm</span></code> using
6688                 <code class="computeroutput"><span class="string">"%F %H:%M:"</span></code>
6689               </p>
6690 <p>
6691                 Next output a <code class="computeroutput"><span class="keyword">double</span></code>
6692                 representing the number of seconds stored in the <code class="computeroutput"><span class="identifier">tm</span></code>
6693                 plus the fractional seconds represented in <code class="computeroutput"><span class="identifier">tp</span></code>.
6694                 The format shall be <code class="computeroutput"><span class="identifier">ios</span><span class="special">::</span><span class="identifier">fixed</span></code>
6695                 and the precision shall be sufficient to represent <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">duration</span></code> exactly (e.g. if <code class="computeroutput"><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">period</span></code> is micro, the precision
6696                 should be sufficient to output six digits following the decimal point).
6697                 If the number of seconds is less than <code class="computeroutput"><span class="number">10</span></code>,
6698                 the output shall be prefixed by <code class="computeroutput"><span class="char">'0'</span></code>.
6699               </p>
6700 <p>
6701                 Finally if <code class="computeroutput"><span class="identifier">tz</span></code> is
6702                 <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">local</span></code></a>, output the <code class="computeroutput"><span class="identifier">tm</span></code> using the pattern " %z".
6703                 Else append the sequence " +0000" to the stream.
6704               </p>
6705 <p>
6706                 If any step fails, calls <code class="computeroutput"><span class="identifier">os</span><span class="special">.</span><span class="identifier">setstate</span><span class="special">(</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span>
6707                 <span class="special">|</span> <span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">badbit</span><span class="special">)</span></code>.
6708               </p>
6709 <p>
6710                 <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">os</span></code>
6711               </p>
6712 </div>
6713 <div class="section">
6714 <div class="titlepage"><div><div><h6 class="title">
6715 <a name="chrono.reference.io.time_point_io_hpp.streams.system_clock.op_in"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.streams.system_clock.op_in" title="Non Member Function operator&gt;&gt;()">Non
6716               Member Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code></a>
6717 </h6></div></div></div>
6718 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6719     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6720     <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
6721            <span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6722 </pre>
6723 <p>
6724                 <span class="bold"><strong>Effects:</strong></span> Behaves as a formatted
6725                 input function. After constructing a sentry object, if the sentry
6726                 converts to true, obtains a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">time_get</span></code>
6727                 facet from <code class="computeroutput"><span class="identifier">is</span></code>, and
6728                 obtains a formatting string in the same manner as described for insertion
6729                 operator. Extract a <code class="computeroutput"><span class="identifier">tm</span></code>
6730                 using the supplied formatting string, or if empty, defaulted as described
6731                 for the insertion operator. Note that extraction does not use the
6732                 <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> data stored in
6733                 the <code class="computeroutput"><span class="identifier">is</span></code> for the defaulted
6734                 string as the <a class="link" href="reference.html#chrono.reference.io.timezone_hpp.timezone" title="Scoped enum timezone"><code class="computeroutput"><span class="identifier">timezone</span></code></a> information is
6735                 stored in the stream.
6736               </p>
6737 <p>
6738                 Any <code class="computeroutput"><span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span>
6739                 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span></code>
6740                 inserted, and then extracted should result in an equal <code class="computeroutput"><span class="identifier">time_point</span><span class="special">&lt;</span><span class="identifier">system_clock</span><span class="special">,</span>
6741                 <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span></code>,
6742                 excepting any precision that did not get inserted.
6743               </p>
6744 <p>
6745                 <span class="bold"><strong>Example:</strong></span>
6746               </p>
6747 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">test</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">time_point</span> <span class="identifier">tp</span><span class="special">)</span>
6748 <span class="special">{</span>
6749     <span class="identifier">std</span><span class="special">::</span><span class="identifier">stringstream</span> <span class="identifier">s</span><span class="special">;</span>
6750     <span class="identifier">s</span> <span class="special">&lt;&lt;</span> <span class="identifier">tp</span><span class="special">;</span>
6751     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">system_clock</span><span class="special">::</span><span class="identifier">time_point</span> <span class="identifier">tp2</span><span class="special">;</span>
6752     <span class="identifier">s</span> <span class="special">&gt;&gt;</span> <span class="identifier">tp2</span><span class="special">;</span>
6753     <span class="identifier">assert</span><span class="special">(</span><span class="identifier">tp</span> <span class="special">==</span> <span class="identifier">tp2</span><span class="special">);</span>
6754 <span class="special">}</span>
6755 </pre>
6756 <p>
6757                 <span class="bold"><strong>Returns:</strong></span> is
6758               </p>
6759 </div>
6760 </div>
6761 <div class="section">
6762 <div class="titlepage"><div><div><h6 class="title">
6763 <a name="chrono.reference.io.time_point_io_hpp.streams.other_clocks"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.streams.other_clocks" title="Other Clocks">Other
6764             Clocks</a>
6765 </h6></div></div></div>
6766 <div class="section">
6767 <div class="titlepage"><div><div><h6 class="title">
6768 <a name="chrono.reference.io.time_point_io_hpp.streams.other_clocks.op_out"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.streams.other_clocks.op_out" title="Non Member Function operator&lt;&lt;()">Non
6769               Member Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;()</span></code></a>
6770 </h6></div></div></div>
6771 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6772     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6773     <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
6774            <span class="keyword">const</span> <span class="identifier">time_point</span><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6775 </pre>
6776 <p>
6777                 <span class="bold"><strong>Effects:</strong></span> Behaves as a formatted
6778                 output function. After constructing a <code class="computeroutput"><span class="identifier">sentry</span></code>
6779                 object, if the <code class="computeroutput"><span class="identifier">sentry</span></code>
6780                 converts to <code class="computeroutput"><span class="keyword">true</span></code>, calls
6781                 to <code class="computeroutput"><span class="identifier">facet</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">os</span><span class="special">,</span><span class="identifier">os</span><span class="special">,</span><span class="identifier">os</span><span class="special">.</span><span class="identifier">fill</span><span class="special">(),</span><span class="identifier">tp</span><span class="special">)</span></code>
6782                 where <code class="computeroutput"><span class="identifier">facet</span></code> is the
6783                 <code class="computeroutput"><span class="identifier">time_point_put</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
6784                 facet associated to <code class="computeroutput"><span class="identifier">os</span></code>
6785                 or a new created instance of the default <code class="computeroutput"><span class="identifier">time_point_put</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code> facet.
6786               </p>
6787 <p>
6788                 <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">os</span></code>.
6789               </p>
6790 <p>
6791                 <span class="bold"><strong>Example:</strong></span>
6792               </p>
6793 <pre class="programlisting"><span class="number">22644271279698</span> <span class="identifier">nanoseconds</span> <span class="identifier">since</span> <span class="identifier">boot</span>
6794 </pre>
6795 </div>
6796 <div class="section">
6797 <div class="titlepage"><div><div><h6 class="title">
6798 <a name="chrono.reference.io.time_point_io_hpp.streams.other_clocks.op_in"></a><a class="link" href="reference.html#chrono.reference.io.time_point_io_hpp.streams.other_clocks.op_in" title="Non Member Function operator&gt;&gt;()">Non
6799               Member Function <code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;()</span></code></a>
6800 </h6></div></div></div>
6801 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;</span>
6802     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6803     <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
6804            <span class="identifier">time_point</span><span class="special">&lt;</span><a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a><span class="special">,</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">Duration</span></code></a><span class="special">&gt;&amp;</span> <span class="identifier">tp</span><span class="special">);</span>
6805 </pre>
6806 <p>
6807                 Extracts <code class="computeroutput"><span class="identifier">tp</span></code> from
6808                 the stream <code class="computeroutput"><span class="identifier">is</span></code>.
6809               </p>
6810 <p>
6811                 <span class="bold"><strong>Effects:</strong></span> Behaves as a formatted
6812                 input function. After constructing a <code class="computeroutput"><span class="identifier">sentry</span></code>
6813                 object, if the <code class="computeroutput"><span class="identifier">sentry</span></code>
6814                 converts to <code class="computeroutput"><span class="keyword">true</span></code>, calls
6815                 to <code class="computeroutput"><span class="identifier">facet</span><span class="special">.</span><span class="identifier">get</span><span class="special">(</span><span class="identifier">is</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istreambuf_iterator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span>
6816                 <span class="identifier">Traits</span><span class="special">&gt;(),</span>
6817                 <span class="identifier">is</span><span class="special">,</span>
6818                 <span class="identifier">err</span><span class="special">,</span>
6819                 <span class="identifier">tp</span><span class="special">)</span></code>
6820                 where <code class="computeroutput"><span class="identifier">facet</span></code> is the
6821                 <code class="computeroutput"><span class="identifier">time_point_get</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code>
6822                 facet associated to <code class="computeroutput"><span class="identifier">is</span></code>
6823                 or a new created instance of the default <code class="computeroutput"><span class="identifier">time_point_get</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span></code> facet.
6824               </p>
6825 <p>
6826                 If any step fails, calls <code class="computeroutput"><span class="identifier">os</span><span class="special">.</span><span class="identifier">setstate</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span>
6827                 <span class="special">|</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">badbit</span><span class="special">)</span></code>.
6828               </p>
6829 <p>
6830                 <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">is</span></code>.
6831               </p>
6832 </div>
6833 </div>
6834 </div>
6835 </div>
6836 </div>
6837 <div class="section">
6838 <div class="titlepage"><div><div><h3 class="title">
6839 <a name="chrono.reference.round"></a><a class="link" href="reference.html#chrono.reference.round" title="Chrono Rounding Utilities">Chrono Rounding Utilities</a>
6840 </h3></div></div></div>
6841 <div class="toc"><dl class="toc">
6842 <dt><span class="section"><a href="reference.html#chrono.reference.round.floor_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">floor</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
6843 <dt><span class="section"><a href="reference.html#chrono.reference.round.round_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">round</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
6844 <dt><span class="section"><a href="reference.html#chrono.reference.round.ceil_hpp">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">ceil</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
6845 </dl></div>
6846 <div class="section">
6847 <div class="titlepage"><div><div><h4 class="title">
6848 <a name="chrono.reference.round.floor_hpp"></a><a class="link" href="reference.html#chrono.reference.round.floor_hpp" title="Header &lt;boost/chrono/floor.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">floor</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
6849 </h4></div></div></div>
6850 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
6851   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">To</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
6852   <span class="identifier">To</span> <span class="identifier">floor</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
6853 <span class="special">}</span> <span class="special">}</span>
6854 </pre>
6855 <p>
6856           This function round down the given parameter.
6857         </p>
6858 </div>
6859 <div class="section">
6860 <div class="titlepage"><div><div><h4 class="title">
6861 <a name="chrono.reference.round.round_hpp"></a><a class="link" href="reference.html#chrono.reference.round.round_hpp" title="Header &lt;boost/chrono/round.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">round</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
6862 </h4></div></div></div>
6863 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
6864   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">To</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
6865   <span class="identifier">To</span> <span class="identifier">round</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
6866 <span class="special">}</span> <span class="special">}</span>
6867 </pre>
6868 <p>
6869           This function round to nearest, to even on tie the given parameter.
6870         </p>
6871 </div>
6872 <div class="section">
6873 <div class="titlepage"><div><div><h4 class="title">
6874 <a name="chrono.reference.round.ceil_hpp"></a><a class="link" href="reference.html#chrono.reference.round.ceil_hpp" title="Header &lt;boost/chrono/ceil.hpp&gt;">Header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">ceil</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
6875 </h4></div></div></div>
6876 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
6877   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">To</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">&gt;</span>
6878   <span class="identifier">To</span> <span class="identifier">ceil</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">duration</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">&gt;&amp;</span> <span class="identifier">d</span><span class="special">);</span>
6879 <span class="special">}</span> <span class="special">}</span>
6880 </pre>
6881 <p>
6882           This function round up the given parameter.
6883         </p>
6884 </div>
6885 </div>
6886 <div class="section">
6887 <div class="titlepage"><div><div><h3 class="title">
6888 <a name="chrono.reference.other_clocks"></a><a class="link" href="reference.html#chrono.reference.other_clocks" title="Other Clocks">Other Clocks</a>
6889 </h3></div></div></div>
6890 <div class="toc"><dl class="toc">
6891 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp">Header
6892         <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">process_cpu_clocks</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
6893 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.thread_clock_hpp">Header
6894         <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">thread_clock</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a></span></dt>
6895 </dl></div>
6896 <div class="section">
6897 <div class="titlepage"><div><div><h4 class="title">
6898 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp" title="Header &lt;boost/chrono/process_cpu_clocks.hpp&gt;">Header
6899         <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">process_cpu_clocks</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
6900 </h4></div></div></div>
6901 <div class="toc"><dl class="toc">
6902 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.BOOST_CHRONO_HAS_PROCESS_CLOCKS">Macro
6903           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span>
6904           </code></a></span></dt>
6905 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock">Class
6906           <code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a></span></dt>
6907 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock">Class
6908           <code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a></span></dt>
6909 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock">Class
6910           <code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a></span></dt>
6911 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock">Class
6912           <code class="computeroutput"><span class="identifier">process_cpu_clock</span></code></a></span></dt>
6913 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times">Template
6914           Class <code class="computeroutput"><span class="identifier">process_times</span></code></a></span></dt>
6915 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times_io"><code class="computeroutput"><span class="identifier">process_times</span></code> Input/Output</a></span></dt>
6916 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times_duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code> Specialization for <code class="computeroutput"><span class="identifier">process_times</span><span class="special">&lt;&gt;</span></code></a></span></dt>
6917 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_real_cpu_clock"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_real_cpu_clock</span><span class="special">&gt;</span></code>
6918           Specialization</a></span></dt>
6919 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_user_cpu_clock"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_user_cpu_clock</span><span class="special">&gt;</span></code>
6920           Specialization</a></span></dt>
6921 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_system_cpu_clock"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_system_cpu_clock</span><span class="special">&gt;</span></code>
6922           Specialization</a></span></dt>
6923 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_cpu_clock"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_cpu_clock</span><span class="special">&gt;</span></code>
6924           Specialization</a></span></dt>
6925 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times_numeric_limits"><code class="computeroutput"><span class="identifier">numeric_limits</span></code> Specialization for <code class="computeroutput"><span class="identifier">process_times</span><span class="special">&lt;&gt;</span></code></a></span></dt>
6926 </dl></div>
6927 <p>
6928           Knowing how long a program takes to execute is useful in both test and
6929           production environments. It is also helpful if such timing information
6930           is broken down into real (wall clock) time, CPU time spent by the user,
6931           and CPU time spent by the operating system servicing user requests.
6932         </p>
6933 <p>
6934           Process clocks don't include the time spent by the child process.
6935         </p>
6936 <pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span>
6937
6938 <span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
6939
6940     <span class="keyword">class</span> <span class="identifier">process_real_cpu_clock</span><span class="special">;</span>
6941     <span class="keyword">class</span> <span class="identifier">process_user_cpu_clock</span><span class="special">;</span>
6942     <span class="keyword">class</span> <span class="identifier">process_system_cpu_clock</span><span class="special">;</span>
6943     <span class="keyword">class</span> <span class="identifier">process_cpu_clock</span><span class="special">;</span>
6944
6945     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
6946     <span class="keyword">struct</span> <span class="identifier">process_times</span><span class="special">;</span>
6947     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
6948     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6949     <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
6950             <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
6951
6952     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
6953     <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
6954     <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
6955             <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
6956
6957     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
6958     <span class="keyword">struct</span> <span class="identifier">duration_values</span><span class="special">&lt;</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
6959
6960     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
6961     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_real_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;;</span>
6962     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_user_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;;</span>
6963     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_system_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;;</span>
6964     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;;</span>
6965
6966 <span class="special">}</span> <span class="special">}</span>
6967 <span class="keyword">namespace</span> <span class="identifier">std</span> <span class="special">{</span>
6968     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
6969     <span class="keyword">class</span> <span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
6970 <span class="special">}</span>
6971 </pre>
6972 <div class="section">
6973 <div class="titlepage"><div><div><h5 class="title">
6974 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.BOOST_CHRONO_HAS_PROCESS_CLOCKS"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.BOOST_CHRONO_HAS_PROCESS_CLOCKS" title="Macro BOOST_CHRONO_HAS_PROCESS_CLOCKS">Macro
6975           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_HAS_PROCESS_CLOCKS</span>
6976           </code></a>
6977 </h5></div></div></div>
6978 <p>
6979             This macro is defined if the platform supports process clocks.
6980           </p>
6981 </div>
6982 <div class="section">
6983 <div class="titlepage"><div><div><h5 class="title">
6984 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock">Class
6985           <code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a>
6986 </h5></div></div></div>
6987 <p>
6988             <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a> satisfy
6989             the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
6990             requirements.
6991           </p>
6992 <p>
6993             <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a> class
6994             provides access to the real process wall-clock steady clock, i.e. the
6995             real CPU-time clock of the calling process. The process relative current
6996             time can be obtained by calling <code class="computeroutput"><span class="identifier">process_real_cpu_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>.
6997           </p>
6998 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">process_real_cpu_clock</span> <span class="special">{</span>
6999 <span class="keyword">public</span><span class="special">:</span>
7000     <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">nanoseconds</span></code></a>                          <span class="identifier">duration</span><span class="special">;</span>
7001     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>                        <span class="identifier">rep</span><span class="special">;</span>
7002     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span>                     <span class="identifier">period</span><span class="special">;</span>
7003     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">process_real_cpu_clock</span><span class="special">&gt;</span>    <span class="identifier">time_point</span><span class="special">;</span>
7004     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_steady</span> <span class="special">=</span>            <span class="keyword">true</span><span class="special">;</span>
7005
7006     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span>  <span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
7007     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span> <span class="special">);</span>
7008 <span class="special">};</span>
7009 </pre>
7010 </div>
7011 <div class="section">
7012 <div class="titlepage"><div><div><h5 class="title">
7013 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock">Class
7014           <code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a>
7015 </h5></div></div></div>
7016 <p>
7017             <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock"><code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a> satisfy
7018             the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
7019             requirements.
7020           </p>
7021 <p>
7022             <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock"><code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a> class
7023             provides access to the user CPU-time steady clock of the calling process.
7024             The process relative user current time can be obtained by calling <code class="computeroutput"><span class="identifier">process_user_cpu_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>.
7025           </p>
7026 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">process_user_cpu_clock</span> <span class="special">{</span>
7027 <span class="keyword">public</span><span class="special">:</span>
7028     <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">nanoseconds</span></code></a>                          <span class="identifier">duration</span><span class="special">;</span>
7029     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>                        <span class="identifier">rep</span><span class="special">;</span>
7030     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span>                     <span class="identifier">period</span><span class="special">;</span>
7031     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">process_user_cpu_clock</span><span class="special">&gt;</span>    <span class="identifier">time_point</span><span class="special">;</span>
7032     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_steady</span> <span class="special">=</span>            <span class="keyword">true</span><span class="special">;</span>
7033
7034     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span>  <span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
7035     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span> <span class="special">);</span>
7036 <span class="special">};</span>
7037 </pre>
7038 </div>
7039 <div class="section">
7040 <div class="titlepage"><div><div><h5 class="title">
7041 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock">Class
7042           <code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a>
7043 </h5></div></div></div>
7044 <p>
7045             <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a> satisfy
7046             the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
7047             requirements.
7048           </p>
7049 <p>
7050             <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a> class
7051             provides access to the system CPU-time steady clock of the calling process.
7052             The process relative system current time can be obtained by calling
7053             <code class="computeroutput"><span class="identifier">process_system_cpu_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>.
7054           </p>
7055 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">process_system_cpu_clock</span> <span class="special">{</span>
7056 <span class="keyword">public</span><span class="special">:</span>
7057     <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">nanoseconds</span></code></a>                          <span class="identifier">duration</span><span class="special">;</span>
7058     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>                        <span class="identifier">rep</span><span class="special">;</span>
7059     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span>                     <span class="identifier">period</span><span class="special">;</span>
7060     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">process_system_cpu_clock</span><span class="special">&gt;</span>    <span class="identifier">time_point</span><span class="special">;</span>
7061     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_steady</span> <span class="special">=</span>            <span class="keyword">true</span><span class="special">;</span>
7062
7063     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span>  <span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
7064     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span> <span class="special">);</span>
7065 <span class="special">};</span>
7066 </pre>
7067 </div>
7068 <div class="section">
7069 <div class="titlepage"><div><div><h5 class="title">
7070 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock" title="Class process_cpu_clock">Class
7071           <code class="computeroutput"><span class="identifier">process_cpu_clock</span></code></a>
7072 </h5></div></div></div>
7073 <p>
7074             <code class="computeroutput"><span class="identifier">process_cpu_clock</span></code> can
7075             be considered as a <code class="computeroutput"><span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">process_real_cpu_clock</span><span class="special">,</span> <span class="identifier">process_user_cpu_clock</span><span class="special">,</span> <span class="identifier">process_system_cpu_clock</span><span class="special">&gt;</span></code>.
7076           </p>
7077 <p>
7078             <code class="computeroutput"><span class="identifier">process_cpu_clock</span></code> provides
7079             a thin wrapper around the operating system's process time API. For POSIX-like
7080             systems, that's the times() function, while for Windows, it's the <code class="computeroutput"><span class="identifier">GetProcessTimes</span><span class="special">()</span></code>
7081             function.
7082           </p>
7083 <p>
7084             The process relative real, user and system current time can be obtained
7085             at once by calling <code class="computeroutput"><span class="identifier">process_clocks</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>.
7086           </p>
7087 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">process_cpu_clock</span>
7088 <span class="special">{</span>
7089 <span class="keyword">public</span><span class="special">:</span>
7090     <span class="keyword">typedef</span> <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">nanoseconds</span><span class="special">::</span><span class="identifier">rep</span><span class="special">&gt;</span> <span class="identifier">times</span> <span class="special">;</span>
7091
7092     <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration" title="Class Template duration&lt;&gt;"><code class="computeroutput"><span class="identifier">duration</span></code></a><span class="special">&lt;</span><span class="identifier">times</span><span class="special">,</span>  <span class="identifier">nano</span><span class="special">&gt;</span>                  <span class="identifier">duration</span><span class="special">;</span>
7093     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>                           <span class="identifier">rep</span><span class="special">;</span>
7094     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span>                        <span class="identifier">period</span><span class="special">;</span>
7095     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">process_cpu_clock</span><span class="special">&gt;</span>   <span class="identifier">time_point</span><span class="special">;</span>
7096     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_steady</span> <span class="special">=</span>               <span class="keyword">true</span><span class="special">;</span>
7097
7098     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span>  <span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
7099     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span> <span class="special">);</span>
7100 <span class="special">};</span>
7101 </pre>
7102 </div>
7103 <div class="section">
7104 <div class="titlepage"><div><div><h5 class="title">
7105 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.times"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times" title="Template Class process_times">Template
7106           Class <code class="computeroutput"><span class="identifier">process_times</span></code></a>
7107 </h5></div></div></div>
7108 <p>
7109             This class is the representation of the <code class="computeroutput"><span class="identifier">process_cpu_clock</span><span class="special">::</span><span class="identifier">duration</span></code>
7110             class. As such it needs to implements the arithmetic operators.
7111           </p>
7112 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
7113 <span class="keyword">struct</span> <span class="identifier">process_times</span> <span class="special">:</span> <span class="identifier">arithmetic</span><span class="special">&lt;</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;,</span>
7114     <span class="identifier">multiplicative</span><span class="special">&lt;</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;,</span> <span class="identifier">Rep</span><span class="special">,</span>
7115     <span class="identifier">less_than_comparable</span><span class="special">&lt;</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <span class="special">&gt;</span>
7116 <span class="special">{</span>
7117     <span class="identifier">Rep</span> <span class="identifier">real</span><span class="special">;</span>    <span class="comment">// real (i.e wall clock) time</span>
7118     <span class="identifier">Rep</span> <span class="identifier">user</span><span class="special">;</span>    <span class="comment">// user cpu time</span>
7119     <span class="identifier">Rep</span> <span class="identifier">system</span><span class="special">;</span>  <span class="comment">// system cpu time</span>
7120
7121     <span class="identifier">times</span><span class="special">();</span>
7122     <span class="identifier">times</span><span class="special">(</span>
7123         <span class="identifier">process_real_cpu_clock</span><span class="special">::</span><span class="identifier">rep</span> <span class="identifier">r</span><span class="special">,</span>
7124         <span class="identifier">process_user_cpu_clock</span><span class="special">::</span><span class="identifier">rep</span> <span class="identifier">u</span><span class="special">,</span>
7125         <span class="identifier">process_system_cpu_clock</span><span class="special">::</span><span class="identifier">rep</span> <span class="identifier">s</span><span class="special">);</span>
7126
7127     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
7128     <span class="keyword">explicit</span> <span class="identifier">process_times</span><span class="special">(</span>
7129         <span class="identifier">Rep2</span> <span class="identifier">r</span><span class="special">);</span>
7130     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
7131     <span class="keyword">explicit</span> <span class="identifier">process_times</span><span class="special">(</span>
7132         <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7133     <span class="keyword">operator</span> <span class="identifier">rep</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
7134
7135     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">process_times</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7136     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Rep2</span><span class="special">&gt;</span>
7137     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep2</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7138
7139     <span class="identifier">times</span> <span class="keyword">operator</span><span class="special">+=(</span><span class="identifier">process_times</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7140     <span class="identifier">times</span> <span class="keyword">operator</span><span class="special">-=(</span><span class="identifier">process_times</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7141     <span class="identifier">times</span> <span class="keyword">operator</span><span class="special">*=(</span><span class="identifier">process_times</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7142     <span class="identifier">times</span> <span class="keyword">operator</span><span class="special">/=(</span><span class="identifier">process_times</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7143     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;(</span><span class="identifier">process_times</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
7144 <span class="special">};</span>
7145 </pre>
7146 </div>
7147 <div class="section">
7148 <div class="titlepage"><div><div><h5 class="title">
7149 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.times_io"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times_io" title="process_times Input/Output"><code class="computeroutput"><span class="identifier">process_times</span></code> Input/Output</a>
7150 </h5></div></div></div>
7151 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
7152 <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
7153 <span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
7154         <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7155 </pre>
7156 <p>
7157             <span class="bold"><strong>Effects:</strong></span> Output each part separated
7158             by ';' and surrounded by '{', '}'.
7159           </p>
7160 <p>
7161             <span class="bold"><strong>Throws:</strong></span> None.
7162           </p>
7163 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
7164 <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span>
7165 <span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;&amp;</span> <span class="identifier">is</span><span class="special">,</span>
7166         <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
7167 </pre>
7168 <p>
7169             <span class="bold"><strong>Effects:</strong></span> overrides the value of rhs
7170             if the input stream has the format "{r;u;s}". Otherwise, set
7171             the input stream state as failbit | eofbit.
7172           </p>
7173 <p>
7174             <span class="bold"><strong>Throws:</strong></span> None.
7175           </p>
7176 </div>
7177 <div class="section">
7178 <div class="titlepage"><div><div><h5 class="title">
7179 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.times_duration_values"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times_duration_values" title="duration_values Specialization for process_times&lt;&gt;"><code class="computeroutput"><span class="identifier">duration_values</span></code> Specialization for <code class="computeroutput"><span class="identifier">process_times</span><span class="special">&lt;&gt;</span></code></a>
7180 </h5></div></div></div>
7181 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">&gt;</span>
7182 <span class="keyword">struct</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.traits.duration_values" title="Class Template duration_values"><code class="computeroutput"><span class="identifier">duration_values</span></code></a><span class="special">&lt;</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="special">&gt;</span>
7183 <span class="special">{</span>
7184     <span class="keyword">static</span> <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="identifier">zero</span><span class="special">();</span>
7185     <span class="keyword">static</span> <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="identifier">max</span><span class="special">();</span>
7186     <span class="keyword">static</span> <span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="identifier">min</span><span class="special">();</span>
7187 <span class="special">};</span>
7188 </pre>
7189 <p>
7190             The <code class="computeroutput"><span class="identifier">times</span></code> specific functions
7191             <code class="computeroutput"><span class="identifier">zero</span><span class="special">()</span></code>,
7192             <code class="computeroutput"><span class="identifier">max</span><span class="special">()</span></code>
7193             and <code class="computeroutput"><span class="identifier">min</span><span class="special">()</span></code>
7194             uses the relative functions on the representation of each component.
7195           </p>
7196 </div>
7197 <div class="section">
7198 <div class="titlepage"><div><div><h5 class="title">
7199 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_real_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_real_cpu_clock" title="clock_string&lt;process_real_cpu_clock&gt; Specialization"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_real_cpu_clock</span><span class="special">&gt;</span></code>
7200           Specialization</a>
7201 </h5></div></div></div>
7202 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7203 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_real_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7204 <span class="special">{</span>
7205     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
7206     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
7207 <span class="special">};</span>
7208 </pre>
7209 <p>
7210             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
7211             returns "process_real_cpu_clock".
7212           </p>
7213 <p>
7214             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
7215             returns " since process start-up"
7216           </p>
7217 </div>
7218 <div class="section">
7219 <div class="titlepage"><div><div><h5 class="title">
7220 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_user_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_user_cpu_clock" title="clock_string&lt;process_user_cpu_clock&gt; Specialization"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_user_cpu_clock</span><span class="special">&gt;</span></code>
7221           Specialization</a>
7222 </h5></div></div></div>
7223 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7224 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_user_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7225 <span class="special">{</span>
7226     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
7227     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
7228 <span class="special">};</span>
7229 </pre>
7230 <p>
7231             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
7232             returns "process_user_cpu_clock".
7233           </p>
7234 <p>
7235             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
7236             returns " since process start-up"
7237           </p>
7238 </div>
7239 <div class="section">
7240 <div class="titlepage"><div><div><h5 class="title">
7241 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_system_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_system_cpu_clock" title="clock_string&lt;process_system_cpu_clock&gt; Specialization"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_system_cpu_clock</span><span class="special">&gt;</span></code>
7242           Specialization</a>
7243 </h5></div></div></div>
7244 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7245 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_system_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7246 <span class="special">{</span>
7247     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
7248     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
7249 <span class="special">};</span>
7250 </pre>
7251 <p>
7252             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
7253             returns "process_system_cpu_clock".
7254           </p>
7255 <p>
7256             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
7257             returns " since process start-up"
7258           </p>
7259 </div>
7260 <div class="section">
7261 <div class="titlepage"><div><div><h5 class="title">
7262 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_cpu_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.clock_string_process_cpu_clock" title="clock_string&lt;process_cpu_clock&gt; Specialization"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_cpu_clock</span><span class="special">&gt;</span></code>
7263           Specialization</a>
7264 </h5></div></div></div>
7265 <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7266 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">process_cpu_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7267 <span class="special">{</span>
7268     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
7269     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
7270 <span class="special">};</span>
7271 </pre>
7272 <p>
7273             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
7274             returns "process_cpu_clock".
7275           </p>
7276 <p>
7277             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
7278             returns " since process start-up"
7279           </p>
7280 </div>
7281 <div class="section">
7282 <div class="titlepage"><div><div><h5 class="title">
7283 <a name="chrono.reference.other_clocks.process_cpu_clocks_hpp.times_numeric_limits"></a><a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.times_numeric_limits" title="numeric_limits Specialization for process_times&lt;&gt;"><code class="computeroutput"><span class="identifier">numeric_limits</span></code> Specialization for <code class="computeroutput"><span class="identifier">process_times</span><span class="special">&lt;&gt;</span></code></a>
7284 </h5></div></div></div>
7285 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">std</span> <span class="special">{</span>
7286     <span class="keyword">template</span> <span class="special">&lt;&gt;</span>
7287     <span class="keyword">class</span> <span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;&gt;</span> <span class="special">{</span>
7288         <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span> <span class="identifier">Res</span><span class="special">;</span>
7289
7290     <span class="keyword">public</span><span class="special">:</span>
7291         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">is_specialized</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span>
7292         <span class="keyword">static</span> <span class="identifier">Res</span> <span class="identifier">min</span><span class="special">();</span>
7293         <span class="keyword">static</span> <span class="identifier">Res</span> <span class="identifier">max</span><span class="special">();</span>
7294         <span class="keyword">static</span> <span class="identifier">Res</span> <span class="identifier">lowest</span><span class="special">();</span>
7295         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">digits</span><span class="special">;</span>
7296         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">digits10</span><span class="special">;</span>
7297         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">is_signed</span> <span class="special">=</span> <span class="keyword">false</span><span class="special">;</span>
7298         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">is_integer</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span>
7299         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">is_exact</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span>
7300         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">radix</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
7301     <span class="special">};</span>
7302 <span class="special">}</span>
7303 </pre>
7304 <p>
7305             The <code class="computeroutput"><span class="identifier">process_times</span><span class="special">&lt;</span><span class="identifier">Rep</span><span class="special">&gt;</span></code>
7306             specialization functions <code class="computeroutput"><span class="identifier">min</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">max</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">lowest</span><span class="special">()</span></code> uses the relative functions on the
7307             representation of each component.
7308           </p>
7309 <p>
7310             Notes
7311           </p>
7312 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
7313 <li class="listitem">
7314                 <code class="computeroutput"><span class="identifier">min</span><span class="special">()</span></code>
7315                 returns the tuple of mins.
7316               </li>
7317 <li class="listitem">
7318                 <code class="computeroutput"><span class="identifier">max</span><span class="special">()</span></code>
7319                 returns the tuple of maxs.
7320               </li>
7321 <li class="listitem">
7322                 <code class="computeroutput"><span class="identifier">lowest</span><span class="special">()</span></code>
7323                 returns the tuple of lowests.
7324               </li>
7325 <li class="listitem">
7326                 <code class="computeroutput"><span class="identifier">digits</span></code> is the sum
7327                 of (binary) digits.
7328               </li>
7329 <li class="listitem">
7330                 <code class="computeroutput"><span class="identifier">digits10</span></code> is the sum
7331                 of digits10s.
7332               </li>
7333 </ul></div>
7334 </div>
7335 </div>
7336 <div class="section">
7337 <div class="titlepage"><div><div><h4 class="title">
7338 <a name="chrono.reference.other_clocks.thread_clock_hpp"></a><a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp" title="Header &lt;boost/chrono/thread_clock.hpp&gt;">Header
7339         <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">chrono</span><span class="special">/</span><span class="identifier">thread_clock</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>
7340 </h4></div></div></div>
7341 <div class="toc"><dl class="toc">
7342 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.BOOST_CHRONO_HAS_THREAD_CLOCK">Macro
7343           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_HAS_THREAD_CLOCK</span></code></a></span></dt>
7344 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.BOOST_CHRONO_THREAD_CLOCK_IS_STEADY">Macro
7345           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_THREAD_CLOCK_IS_STEADY</span></code></a></span></dt>
7346 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock">Class
7347           <code class="computeroutput"><span class="identifier">thread_clock</span></code></a></span></dt>
7348 <dt><span class="section"><a href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.clock_string_thread_clock"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">thread_clock</span><span class="special">&gt;</span></code>
7349           Specialization</a></span></dt>
7350 </dl></div>
7351 <p>
7352           Knowing the time a thread takes to execute is useful in both test and production
7353           environments.
7354         </p>
7355 <pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_CHRONO_HAS_THREAD_CLOCK</span>
7356 <span class="preprocessor">#define</span> <span class="identifier">BOOST_CHRONO_THREAD_CLOCK_IS_STEADY</span>
7357 <span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">chrono</span> <span class="special">{</span>
7358
7359     <span class="keyword">class</span> <span class="identifier">thread_clock</span><span class="special">;</span>
7360     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7361     <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">thread_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;;</span>
7362
7363 <span class="special">}</span> <span class="special">}</span>
7364 </pre>
7365 <div class="section">
7366 <div class="titlepage"><div><div><h5 class="title">
7367 <a name="chrono.reference.other_clocks.thread_clock_hpp.BOOST_CHRONO_HAS_THREAD_CLOCK"></a><a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.BOOST_CHRONO_HAS_THREAD_CLOCK" title="Macro BOOST_CHRONO_HAS_THREAD_CLOCK">Macro
7368           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_HAS_THREAD_CLOCK</span></code></a>
7369 </h5></div></div></div>
7370 <p>
7371             This macro is defined if the platform supports thread clocks.
7372           </p>
7373 </div>
7374 <div class="section">
7375 <div class="titlepage"><div><div><h5 class="title">
7376 <a name="chrono.reference.other_clocks.thread_clock_hpp.BOOST_CHRONO_THREAD_CLOCK_IS_STEADY"></a><a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.BOOST_CHRONO_THREAD_CLOCK_IS_STEADY" title="Macro BOOST_CHRONO_THREAD_CLOCK_IS_STEADY">Macro
7377           <code class="computeroutput"><span class="identifier">BOOST_CHRONO_THREAD_CLOCK_IS_STEADY</span></code></a>
7378 </h5></div></div></div>
7379 <p>
7380             This macro is defined if the platform has a thread clock. Its value is
7381             true if it is steady and false otherwise.
7382           </p>
7383 </div>
7384 <div class="section">
7385 <div class="titlepage"><div><div><h5 class="title">
7386 <a name="chrono.reference.other_clocks.thread_clock_hpp.thread_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock">Class
7387           <code class="computeroutput"><span class="identifier">thread_clock</span></code></a>
7388 </h5></div></div></div>
7389 <p>
7390             <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a> satisfy the <a class="link" href="reference.html#chrono.reference.cpp0x.clock" title="Clock Requirements"><code class="computeroutput"><span class="identifier">Clock</span></code></a>
7391             requirements.
7392           </p>
7393 <p>
7394             <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a> class provides
7395             access to the real thread wall-clock, i.e. the real CPU-time clock of
7396             the calling thread. The thread relative current time can be obtained
7397             by calling <code class="computeroutput"><span class="identifier">thread_clock</span><span class="special">::</span><span class="identifier">now</span><span class="special">()</span></code>.
7398           </p>
7399 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">thread_clock</span> <span class="special">{</span>
7400 <span class="keyword">public</span><span class="special">:</span>
7401     <span class="keyword">typedef</span> <a class="link" href="reference.html#chrono.reference.cpp0x.duration_hpp.duration_typedefs" title="duration typedefs"><code class="computeroutput"><span class="identifier">nanoseconds</span></code></a>                          <span class="identifier">duration</span><span class="special">;</span>
7402     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">rep</span>                        <span class="identifier">rep</span><span class="special">;</span>
7403     <span class="keyword">typedef</span> <span class="identifier">duration</span><span class="special">::</span><span class="identifier">period</span>                     <span class="identifier">period</span><span class="special">;</span>
7404     <span class="keyword">typedef</span> <span class="identifier">chrono</span><span class="special">::</span><a class="link" href="reference.html#chrono.reference.cpp0x.time_point_hpp.time_point" title="Class template time_point&lt;&gt;"><code class="computeroutput"><span class="identifier">time_point</span></code></a><span class="special">&lt;</span><span class="identifier">thread_clock</span><span class="special">&gt;</span>     <span class="identifier">time_point</span><span class="special">;</span>
7405     <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span> <span class="identifier">is_steady</span> <span class="special">=</span>            <span class="identifier">BOOST_CHRONO_THREAD_CLOCK_IS_STEADY</span><span class="special">;</span>
7406
7407     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span>  <span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
7408     <span class="keyword">static</span> <span class="identifier">time_point</span> <span class="identifier">now</span><span class="special">(</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span> <span class="special">);</span>
7409 <span class="special">};</span>
7410 </pre>
7411 </div>
7412 <div class="section">
7413 <div class="titlepage"><div><div><h5 class="title">
7414 <a name="chrono.reference.other_clocks.thread_clock_hpp.clock_string_thread_clock"></a><a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.clock_string_thread_clock" title="clock_string&lt;thread_clock&gt; Specialization"><code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">thread_clock</span><span class="special">&gt;</span></code>
7415           Specialization</a>
7416 </h5></div></div></div>
7417 <pre class="programlisting"><span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_CHRONO_HAS_THREAD_CLOCK</span><span class="special">)</span>
7418 <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7419 <span class="keyword">struct</span> <span class="identifier">clock_string</span><span class="special">&lt;</span><span class="identifier">thread_clock</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">&gt;</span>
7420 <span class="special">{</span>
7421     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">name</span><span class="special">();</span>
7422     <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="identifier">since</span><span class="special">();</span>
7423 <span class="special">};</span>
7424 <span class="preprocessor">#endif</span>
7425 </pre>
7426 <p>
7427             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">name</span><span class="special">()</span></code>
7428             returns "thread_clock".
7429           </p>
7430 <p>
7431             <code class="computeroutput"><span class="identifier">clock_string</span><span class="special">&lt;&gt;::</span><span class="identifier">since</span><span class="special">()</span></code>
7432             returns " since thread start-up"
7433           </p>
7434 </div>
7435 </div>
7436 </div>
7437 </div>
7438 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
7439 <td align="left"></td>
7440 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Howard Hinnant<br>Copyright &#169; 2006, 2008 Beman Dawes<br>Copyright &#169; 2009-2013 Vicente J. Botet Escriba<p>
7441         Distributed under the Boost Software License, Version 1.0. (See accompanying
7442         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
7443       </p>
7444 </div></td>
7445 </tr></table>
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