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  20 <a name="attributes"></a>Attributes</h3></div></div></div>
  21 <div class="toc"><dl class="toc">
  22 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.attribute_hpp">Header &lt;boost/log/attributes/attribute.hpp&gt;</a></span></dt>
  23 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.attribute_cast_hpp">Header &lt;boost/log/attributes/attribute_cast.hpp&gt;</a></span></dt>
  24 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.attribute_name_hpp">Header &lt;boost/log/attributes/attribute_name.hpp&gt;</a></span></dt>
  25 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.attribute_set_hpp">Header &lt;boost/log/attributes/attribute_set.hpp&gt;</a></span></dt>
  26 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.attribute_value_hpp">Header &lt;boost/log/attributes/attribute_value.hpp&gt;</a></span></dt>
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  29 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.clock_hpp">Header &lt;boost/log/attributes/clock.hpp&gt;</a></span></dt>
  30 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.constant_hpp">Header &lt;boost/log/attributes/constant.hpp&gt;</a></span></dt>
  31 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.counter_hpp">Header &lt;boost/log/attributes/counter.hpp&gt;</a></span></dt>
  32 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.current_process_id_hpp">Header &lt;boost/log/attributes/current_process_id.hpp&gt;</a></span></dt>
  33 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.current_process_name_hpp">Header &lt;boost/log/attributes/current_process_name.hpp&gt;</a></span></dt>
  34 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.current_thread_id_hpp">Header &lt;boost/log/attributes/current_thread_id.hpp&gt;</a></span></dt>
  35 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.fallback_policy_hpp">Header &lt;boost/log/attributes/fallback_policy.hpp&gt;</a></span></dt>
  36 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.fallback_policy_fwd_hpp">Header &lt;boost/log/attributes/fallback_policy_fwd.hpp&gt;</a></span></dt>
  37 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.function_hpp">Header &lt;boost/log/attributes/function.hpp&gt;</a></span></dt>
  38 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.mutable_constant_hpp">Header &lt;boost/log/attributes/mutable_constant.hpp&gt;</a></span></dt>
  39 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.named_scope_hpp">Header &lt;boost/log/attributes/named_scope.hpp&gt;</a></span></dt>
  40 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.scoped_attribute_hpp">Header &lt;boost/log/attributes/scoped_attribute.hpp&gt;</a></span></dt>
  41 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.time_traits_hpp">Header &lt;boost/log/attributes/time_traits.hpp&gt;</a></span></dt>
  42 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.timer_hpp">Header &lt;boost/log/attributes/timer.hpp&gt;</a></span></dt>
  43 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.value_extraction_hpp">Header &lt;boost/log/attributes/value_extraction.hpp&gt;</a></span></dt>
  44 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.value_extraction_fwd_hpp">Header &lt;boost/log/attributes/value_extraction_fwd.hpp&gt;</a></span></dt>
  45 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.value_visitation_hpp">Header &lt;boost/log/attributes/value_visitation.hpp&gt;</a></span></dt>
  46 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.value_visitation_fwd_hpp">Header &lt;boost/log/attributes/value_visitation_fwd.hpp&gt;</a></span></dt>
  47 </dl></div>
  48 <div class="section">
  49 <div class="titlepage"><div><div><h4 class="title">
  50 <a name="header.boost.log.attributes.attribute_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/attribute.hpp" target="_top">boost/log/attributes/attribute.hpp</a>&gt;</h4></div></div></div>
  51 <p>Andrey Semashev </p>
  52 <p>
  53
  54 </p>
  55 <p>15.04.2007</p>
  56 <p>
  57
  58 The header contains attribute interface definition. </p>
  59 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  60   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
  61     <span class="keyword">class</span> <a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a><span class="special">;</span>
  62     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idm45711349310016.html" title="Function swap"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  63   <span class="special">}</span>
  64 <span class="special">}</span></pre>
  65 </div>
  66 <div class="section">
  67 <div class="titlepage"><div><div><h4 class="title">
  68 <a name="header.boost.log.attributes.attribute_cast_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/attribute_cast.hpp" target="_top">boost/log/attributes/attribute_cast.hpp</a>&gt;</h4></div></div></div>
  69 <p>Andrey Semashev </p>
  70 <p>
  71
  72 </p>
  73 <p>06.08.2010</p>
  74 <p>
  75
  76 The header contains utilities for casting between attribute factories. </p>
  77 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  78   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
  79     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">T</span> <a class="link" href="boost/log/attribute_cast.html" title="Function template attribute_cast"><span class="identifier">attribute_cast</span></a><span class="special">(</span><a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  80     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
  81       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/cast_source.html" title="Class cast_source">cast_source</a><span class="special">;</span>
  82     <span class="special">}</span>
  83   <span class="special">}</span>
  84 <span class="special">}</span></pre>
  85 </div>
  86 <div class="section">
  87 <div class="titlepage"><div><div><h4 class="title">
  88 <a name="header.boost.log.attributes.attribute_name_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/attribute_name.hpp" target="_top">boost/log/attributes/attribute_name.hpp</a>&gt;</h4></div></div></div>
  89 <p>Andrey Semashev </p>
  90 <p>
  91
  92 </p>
  93 <p>28.06.2010</p>
  94 <p>
  95
  96 The header contains attribute name interface definition. </p>
  97 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  98   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
  99     <span class="keyword">class</span> <a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a><span class="special">;</span>
 100     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> TraitsT<span class="special">&gt;</span>
 101       <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">TraitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
 102       <a class="link" href="boost/log/operator_idm45711349235344.html" title="Function template operator&lt;&lt;"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></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">TraitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
 103                  <a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 104   <span class="special">}</span>
 105 <span class="special">}</span></pre>
 106 </div>
 107 <div class="section">
 108 <div class="titlepage"><div><div><h4 class="title">
 109 <a name="header.boost.log.attributes.attribute_set_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/attribute_set.hpp" target="_top">boost/log/attributes/attribute_set.hpp</a>&gt;</h4></div></div></div>
 110 <p>Andrey Semashev </p>
 111 <p>
 112
 113 </p>
 114 <p>08.03.2007</p>
 115 <p>
 116
 117 This header contains definition of the attribute set container. </p>
 118 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 119   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 120     <span class="keyword">class</span> <a class="link" href="boost/log/attribute_set.html" title="Class attribute_set">attribute_set</a><span class="special">;</span>
 121     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idm45711349124800.html" title="Function swap"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_set.html" title="Class attribute_set">attribute_set</a> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute_set.html" title="Class attribute_set">attribute_set</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 122   <span class="special">}</span>
 123 <span class="special">}</span></pre>
 124 </div>
 125 <div class="section">
 126 <div class="titlepage"><div><div><h4 class="title">
 127 <a name="header.boost.log.attributes.attribute_value_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/attribute_value.hpp" target="_top">boost/log/attributes/attribute_value.hpp</a>&gt;</h4></div></div></div>
 128 <p>Andrey Semashev </p>
 129 <p>
 130
 131 </p>
 132 <p>21.05.2010</p>
 133 <p>
 134
 135 The header contains <code class="computeroutput">attribute_value</code> class definition. </p>
 136 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 137   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 138     <span class="keyword">class</span> <a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a><span class="special">;</span>
 139     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idm45711349029984.html" title="Function swap"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 140   <span class="special">}</span>
 141 <span class="special">}</span></pre>
 142 </div>
 143 <div class="section">
 144 <div class="titlepage"><div><div><h4 class="title">
 145 <a name="header.boost.log.attributes.attribute_value_impl_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/attribute_value_impl.hpp" target="_top">boost/log/attributes/attribute_value_impl.hpp</a>&gt;</h4></div></div></div>
 146 <p>Andrey Semashev </p>
 147 <p>
 148
 149 </p>
 150 <p>24.06.2007</p>
 151 <p>
 152
 153 The header contains an implementation of a basic attribute value implementation class. </p>
 154 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 155   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 156     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 157       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="boost/log/attributes/attribute_value_impl.html" title="Class template attribute_value_impl">attribute_value_impl</a><span class="special">;</span>
 158       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a> <a class="link" href="boost/log/attributes/make_attribute_value.html" title="Function template make_attribute_value"><span class="identifier">make_attribute_value</span></a><span class="special">(</span><span class="identifier">T</span> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
 159     <span class="special">}</span>
 160   <span class="special">}</span>
 161 <span class="special">}</span></pre>
 162 </div>
 163 <div class="section">
 164 <div class="titlepage"><div><div><h4 class="title">
 165 <a name="header.boost.log.attributes.attribute_value_set_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/attribute_value_set.hpp" target="_top">boost/log/attributes/attribute_value_set.hpp</a>&gt;</h4></div></div></div>
 166 <p>Andrey Semashev </p>
 167 <p>
 168
 169 </p>
 170 <p>21.04.2007</p>
 171 <p>
 172
 173 This header file contains definition of attribute value set. The set is constructed from three attribute sets (global, thread-specific and source-specific) and contains attribute values. </p>
 174 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 175   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 176     <span class="keyword">class</span> <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a><span class="special">;</span>
 177     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idm45711348886032.html" title="Function swap"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 178   <span class="special">}</span>
 179 <span class="special">}</span></pre>
 180 </div>
 181 <div class="section">
 182 <div class="titlepage"><div><div><h4 class="title">
 183 <a name="header.boost.log.attributes.clock_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/clock.hpp" target="_top">boost/log/attributes/clock.hpp</a>&gt;</h4></div></div></div>
 184 <p>Andrey Semashev </p>
 185 <p>
 186
 187 </p>
 188 <p>01.12.2007</p>
 189 <p>
 190
 191 The header contains wall clock attribute implementation and typedefs. </p>
 192 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 193   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 194     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 195       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> TimeTraitsT<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="boost/log/attributes/basic_clock.html" title="Class template basic_clock">basic_clock</a><span class="special">;</span>
 196
 197       <span class="keyword">typedef</span> <a class="link" href="boost/log/attributes/basic_clock.html" title="Class template basic_clock">basic_clock</a><span class="special">&lt;</span> <a class="link" href="boost/log/attributes/utc_time_traits.html" title="Struct utc_time_traits">utc_time_traits</a> <span class="special">&gt;</span> <a name="boost.log.attributes.utc_clock"></a><span class="identifier">utc_clock</span><span class="special">;</span>  <span class="comment">// Attribute that returns current UTC time. </span>
 198       <span class="keyword">typedef</span> <a class="link" href="boost/log/attributes/basic_clock.html" title="Class template basic_clock">basic_clock</a><span class="special">&lt;</span> <a class="link" href="boost/log/attributes/local_time_traits.html" title="Struct local_time_traits">local_time_traits</a> <span class="special">&gt;</span> <a name="boost.log.attributes.local_clock"></a><span class="identifier">local_clock</span><span class="special">;</span>  <span class="comment">// Attribute that returns current local time. </span>
 199     <span class="special">}</span>
 200   <span class="special">}</span>
 201 <span class="special">}</span></pre>
 202 </div>
 203 <div class="section">
 204 <div class="titlepage"><div><div><h4 class="title">
 205 <a name="header.boost.log.attributes.constant_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/constant.hpp" target="_top">boost/log/attributes/constant.hpp</a>&gt;</h4></div></div></div>
 206 <p>Andrey Semashev </p>
 207 <p>
 208
 209 </p>
 210 <p>15.04.2007</p>
 211 <p>
 212
 213 The header contains implementation of a constant attribute. </p>
 214 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 215   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 216     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 217       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="boost/log/attributes/constant.html" title="Class template constant">constant</a><span class="special">;</span>
 218       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="boost/log/attributes/make_constant.html" title="Function template make_constant"><span class="identifier">make_constant</span></a><span class="special">(</span><span class="identifier">BOOST_FWD_REF</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
 219     <span class="special">}</span>
 220   <span class="special">}</span>
 221 <span class="special">}</span></pre>
 222 </div>
 223 <div class="section">
 224 <div class="titlepage"><div><div><h4 class="title">
 225 <a name="header.boost.log.attributes.counter_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/counter.hpp" target="_top">boost/log/attributes/counter.hpp</a>&gt;</h4></div></div></div>
 226 <p>Andrey Semashev </p>
 227 <p>
 228
 229 </p>
 230 <p>01.05.2007</p>
 231 <p>
 232
 233 The header contains implementation of the counter attribute. </p>
 234 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 235   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 236     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 237       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="boost/log/attributes/counter.html" title="Class template counter">counter</a><span class="special">;</span>
 238     <span class="special">}</span>
 239   <span class="special">}</span>
 240 <span class="special">}</span></pre>
 241 </div>
 242 <div class="section">
 243 <div class="titlepage"><div><div><h4 class="title">
 244 <a name="header.boost.log.attributes.current_process_id_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/current_process_id.hpp" target="_top">boost/log/attributes/current_process_id.hpp</a>&gt;</h4></div></div></div>
 245 <p>Andrey Semashev </p>
 246 <p>
 247
 248 </p>
 249 <p>12.09.2009</p>
 250 <p>
 251
 252 The header contains implementation of a current process id attribute </p>
 253 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 254   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 255     <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.log.process_id"></a><span class="identifier">process_id</span><span class="special">;</span>  <span class="comment">// Process identifier type used by the library. </span>
 256     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 257       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/current_process_id.html" title="Class current_process_id">current_process_id</a><span class="special">;</span>
 258     <span class="special">}</span>
 259   <span class="special">}</span>
 260 <span class="special">}</span></pre>
 261 </div>
 262 <div class="section">
 263 <div class="titlepage"><div><div><h4 class="title">
 264 <a name="header.boost.log.attributes.current_process_name_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/current_process_name.hpp" target="_top">boost/log/attributes/current_process_name.hpp</a>&gt;</h4></div></div></div>
 265 <p>Andrey Semashev </p>
 266 <p>
 267
 268 </p>
 269 <p>29.07.2012</p>
 270 <p>
 271
 272 The header contains implementation of a current process name attribute </p>
 273 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 274   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 275     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 276       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/current_process_name.html" title="Class current_process_name">current_process_name</a><span class="special">;</span>
 277     <span class="special">}</span>
 278   <span class="special">}</span>
 279 <span class="special">}</span></pre>
 280 </div>
 281 <div class="section">
 282 <div class="titlepage"><div><div><h4 class="title">
 283 <a name="header.boost.log.attributes.current_thread_id_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/current_thread_id.hpp" target="_top">boost/log/attributes/current_thread_id.hpp</a>&gt;</h4></div></div></div>
 284 <p>Andrey Semashev </p>
 285 <p>
 286
 287 </p>
 288 <p>12.09.2009</p>
 289 <p>
 290
 291 The header contains implementation of a current thread id attribute </p>
 292 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 293   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 294     <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.log.thread_id"></a><span class="identifier">thread_id</span><span class="special">;</span>  <span class="comment">// Thread identifier type. </span>
 295     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 296       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/current_thread_id.html" title="Class current_thread_id">current_thread_id</a><span class="special">;</span>
 297     <span class="special">}</span>
 298   <span class="special">}</span>
 299 <span class="special">}</span></pre>
 300 </div>
 301 <div class="section">
 302 <div class="titlepage"><div><div><h4 class="title">
 303 <a name="header.boost.log.attributes.fallback_policy_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/fallback_policy.hpp" target="_top">boost/log/attributes/fallback_policy.hpp</a>&gt;</h4></div></div></div>
 304 <p>Andrey Semashev </p>
 305 <p>
 306
 307 </p>
 308 <p>18.08.2012</p>
 309 <p>
 310
 311 The header contains definition of fallback policies when attribute value visitation or extraction fails. </p>
 312 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 313   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 314     <span class="keyword">struct</span> <a class="link" href="boost/log/fallback_to_none.html" title="Struct fallback_to_none">fallback_to_none</a><span class="special">;</span>
 315     <span class="keyword">struct</span> <a class="link" href="boost/log/fallback_to_throw.html" title="Struct fallback_to_throw">fallback_to_throw</a><span class="special">;</span>
 316   <span class="special">}</span>
 317 <span class="special">}</span></pre>
 318 </div>
 319 <div class="section">
 320 <div class="titlepage"><div><div><h4 class="title">
 321 <a name="header.boost.log.attributes.fallback_policy_fwd_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/fallback_policy_fwd.hpp" target="_top">boost/log/attributes/fallback_policy_fwd.hpp</a>&gt;</h4></div></div></div>
 322 <p>Andrey Semashev </p>
 323 <p>
 324
 325 </p>
 326 <p>18.08.2012</p>
 327 <p>
 328
 329 The header contains forward declaration of fallback policies when attribute value visitation or extraction fails. </p>
 330 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 331   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 332     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DefaultT<span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="boost/log/fallback_to_default.html" title="Struct template fallback_to_default">fallback_to_default</a><span class="special">;</span>
 333   <span class="special">}</span>
 334 <span class="special">}</span></pre>
 335 </div>
 336 <div class="section">
 337 <div class="titlepage"><div><div><h4 class="title">
 338 <a name="header.boost.log.attributes.function_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/function.hpp" target="_top">boost/log/attributes/function.hpp</a>&gt;</h4></div></div></div>
 339 <p>Andrey Semashev </p>
 340 <p>
 341
 342 </p>
 343 <p>24.06.2007</p>
 344 <p>
 345
 346 The header contains implementation of an attribute that calls a third-party function on value acquisition. </p>
 347 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 348   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 349     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 350       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> R<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="boost/log/attributes/function.html" title="Class template function">function</a><span class="special">;</span>
 351       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span>
 352         <a class="link" href="boost/log/attributes/function.html" title="Class template function">function</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">remove_cv</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">(</span><span class="special">)</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="special">&gt;</span>
 353         <a class="link" href="boost/log/attributes/make_function.html" title="Function template make_function"><span class="identifier">make_function</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 354     <span class="special">}</span>
 355   <span class="special">}</span>
 356 <span class="special">}</span></pre>
 357 </div>
 358 <div class="section">
 359 <div class="titlepage"><div><div><h4 class="title">
 360 <a name="header.boost.log.attributes.mutable_constant_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/mutable_constant.hpp" target="_top">boost/log/attributes/mutable_constant.hpp</a>&gt;</h4></div></div></div>
 361 <p>Andrey Semashev </p>
 362 <p>
 363
 364 </p>
 365 <p>06.11.2007</p>
 366 <p>
 367
 368 The header contains implementation of a mutable constant attribute. </p>
 369 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 370   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 371     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 372       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> MutexT <span class="special">=</span> <span class="keyword">void</span><span class="special">,</span>
 373                <span class="keyword">typename</span> ScopedWriteLockT <span class="special">=</span> <span class="keyword">auto</span><span class="special">,</span>
 374                <span class="keyword">typename</span> ScopedReadLockT <span class="special">=</span> <span class="keyword">auto</span><span class="special">&gt;</span>
 375         <span class="keyword">class</span> <a class="link" href="boost/log/attributes/mutable_constant.html" title="Class template mutable_constant">mutable_constant</a><span class="special">;</span>
 376
 377       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="boost/log/attributes/mutable__idm45711348642864.html" title="Class template mutable_constant&lt;T, void, void, void&gt;">mutable_constant</a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">void</span><span class="special">&gt;</span><span class="special">;</span>
 378     <span class="special">}</span>
 379   <span class="special">}</span>
 380 <span class="special">}</span></pre>
 381 </div>
 382 <div class="section">
 383 <div class="titlepage"><div><div><h4 class="title">
 384 <a name="header.boost.log.attributes.named_scope_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/named_scope.hpp" target="_top">boost/log/attributes/named_scope.hpp</a>&gt;</h4></div></div></div>
 385 <p>Andrey Semashev </p>
 386 <p>
 387
 388 </p>
 389 <p>24.06.2007</p>
 390 <p>
 391
 392 The header contains implementation of named scope container and an attribute that allows to put the named scope to log. A number of convenience macros are also provided. </p>
 393 <pre class="synopsis">
 394
 395 <a class="link" href="BOOST_LOG_NAMED_SCOPE.html" title="Macro BOOST_LOG_NAMED_SCOPE">BOOST_LOG_NAMED_SCOPE</a>(name)
 396 <a class="link" href="BOOST_LOG_FUNCTION.html" title="Macro BOOST_LOG_FUNCTION">BOOST_LOG_FUNCTION</a>()
 397 <a class="link" href="BOOST_LOG_FUNC.html" title="Macro BOOST_LOG_FUNC">BOOST_LOG_FUNC</a>()</pre>
 398 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 399   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 400     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 401       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/named_scope.html" title="Class named_scope">named_scope</a><span class="special">;</span>
 402
 403       <span class="keyword">struct</span> <a class="link" href="boost/log/attributes/named_scope_entry.html" title="Struct named_scope_entry">named_scope_entry</a><span class="special">;</span>
 404
 405       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/named_scope_list.html" title="Class named_scope_list">named_scope_list</a><span class="special">;</span>
 406       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> TraitsT<span class="special">&gt;</span>
 407         <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">TraitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
 408         <a class="link" href="boost/log/attributes/operator_idm45711348515120.html" title="Function template operator&lt;&lt;"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></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">TraitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
 409                    <a class="link" href="boost/log/attributes/named_scope_list.html" title="Class named_scope_list">named_scope_list</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 410     <span class="special">}</span>
 411   <span class="special">}</span>
 412 <span class="special">}</span></pre>
 413 </div>
 414 <div class="section">
 415 <div class="titlepage"><div><div><h4 class="title">
 416 <a name="header.boost.log.attributes.scoped_attribute_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/scoped_attribute.hpp" target="_top">boost/log/attributes/scoped_attribute.hpp</a>&gt;</h4></div></div></div>
 417 <p>Andrey Semashev </p>
 418 <p>
 419
 420 </p>
 421 <p>13.05.2007</p>
 422 <p>
 423
 424 The header contains definition of facilities to define scoped attributes. </p>
 425 <pre class="synopsis">
 426
 427 <a class="link" href="BOOST_LO_idm45711348486016.html" title="Macro BOOST_LOG_SCOPED_LOGGER_ATTR">BOOST_LOG_SCOPED_LOGGER_ATTR</a>(logger, attr_name, attr)
 428 <a class="link" href="BOOST_LO_idm45711348483632.html" title="Macro BOOST_LOG_SCOPED_LOGGER_TAG">BOOST_LOG_SCOPED_LOGGER_TAG</a>(logger, attr_name, attr_value)
 429 <a class="link" href="BOOST_LO_idm45711348481248.html" title="Macro BOOST_LOG_SCOPED_THREAD_ATTR">BOOST_LOG_SCOPED_THREAD_ATTR</a>(attr_name, attr)
 430 <a class="link" href="BOOST_LO_idm45711348479264.html" title="Macro BOOST_LOG_SCOPED_THREAD_TAG">BOOST_LOG_SCOPED_THREAD_TAG</a>(attr_name, attr_value)</pre>
 431 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 432   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 433     <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.log.scoped_attribute"></a><span class="identifier">scoped_attribute</span><span class="special">;</span>  <span class="comment">// Scoped attribute guard type. </span>
 434     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> LoggerT<span class="special">&gt;</span>
 435       <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="boost/log/add_scop_idm45711348499472.html" title="Function template add_scoped_logger_attribute"><span class="identifier">add_scoped_logger_attribute</span></a><span class="special">(</span><span class="identifier">LoggerT</span> <span class="special">&amp;</span><span class="special">,</span>
 436                                               <a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 437                                               <a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 438     <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="boost/log/add_scop_idm45711348491920.html" title="Function add_scoped_thread_attribute"><span class="identifier">add_scoped_thread_attribute</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 439                                             <a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 440   <span class="special">}</span>
 441 <span class="special">}</span></pre>
 442 </div>
 443 <div class="section">
 444 <div class="titlepage"><div><div><h4 class="title">
 445 <a name="header.boost.log.attributes.time_traits_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/time_traits.hpp" target="_top">boost/log/attributes/time_traits.hpp</a>&gt;</h4></div></div></div>
 446 <p>Andrey Semashev </p>
 447 <p>
 448
 449 </p>
 450 <p>01.12.2007</p>
 451 <p>
 452
 453 The header contains implementation of time traits that are used in various parts of the library to acquire current time. </p>
 454 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 455   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 456     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 457       <span class="keyword">struct</span> <a class="link" href="boost/log/attributes/basic_time_traits.html" title="Struct basic_time_traits">basic_time_traits</a><span class="special">;</span>
 458       <span class="keyword">struct</span> <a class="link" href="boost/log/attributes/local_time_traits.html" title="Struct local_time_traits">local_time_traits</a><span class="special">;</span>
 459       <span class="keyword">struct</span> <a class="link" href="boost/log/attributes/utc_time_traits.html" title="Struct utc_time_traits">utc_time_traits</a><span class="special">;</span>
 460     <span class="special">}</span>
 461   <span class="special">}</span>
 462 <span class="special">}</span></pre>
 463 </div>
 464 <div class="section">
 465 <div class="titlepage"><div><div><h4 class="title">
 466 <a name="header.boost.log.attributes.timer_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/timer.hpp" target="_top">boost/log/attributes/timer.hpp</a>&gt;</h4></div></div></div>
 467 <p>Andrey Semashev </p>
 468 <p>
 469
 470 </p>
 471 <p>02.12.2007</p>
 472 <p>
 473
 474 The header contains implementation of a stop watch attribute. </p>
 475 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 476   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 477     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 478       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/timer.html" title="Class timer">timer</a><span class="special">;</span>
 479     <span class="special">}</span>
 480   <span class="special">}</span>
 481 <span class="special">}</span></pre>
 482 </div>
 483 <div class="section">
 484 <div class="titlepage"><div><div><h4 class="title">
 485 <a name="header.boost.log.attributes.value_extraction_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/value_extraction.hpp" target="_top">boost/log/attributes/value_extraction.hpp</a>&gt;</h4></div></div></div>
 486 <p>Andrey Semashev </p>
 487 <p>
 488
 489 </p>
 490 <p>01.03.2008</p>
 491 <p>
 492
 493 The header contains implementation of tools for extracting an attribute value from the view. </p>
 494 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 495   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 496     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 497       <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">result_of::extract</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 498       <a class="link" href="boost/log/extract_idm45711348442880.html" title="Function template extract"><span class="identifier">extract</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 499     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 500       <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">result_of::extract</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 501       <a class="link" href="boost/log/extract_idm45711348435232.html" title="Function template extract"><span class="identifier">extract</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 502     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 503       <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">result_of::extract</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 504       <a class="link" href="boost/log/extract_idm45711348427856.html" title="Function template extract"><span class="identifier">extract</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 505     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 506       <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">result_of::extract</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="boost/log/extract_idm45711348420480.html" title="Function template extract"><span class="identifier">extract</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 507     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 508       <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">result_of::extract_or_throw</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 509       <a class="link" href="boost/log/extract__idm45711348414320.html" title="Function template extract_or_throw"><span class="identifier">extract_or_throw</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 510     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 511       <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">result_of::extract_or_throw</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 512       <a class="link" href="boost/log/extract__idm45711348405936.html" title="Function template extract_or_throw"><span class="identifier">extract_or_throw</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 513     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 514       <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">result_of::extract_or_throw</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 515       <a class="link" href="boost/log/extract__idm45711348397824.html" title="Function template extract_or_throw"><span class="identifier">extract_or_throw</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 516     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 517       <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">result_of::extract_or_throw</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 518       <a class="link" href="boost/log/extract__idm45711348389712.html" title="Function template extract_or_throw"><span class="identifier">extract_or_throw</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 519     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 520       <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">result_of::extract_or_default</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">DefaultT</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 521       <a class="link" href="boost/log/extract__idm45711348382816.html" title="Function template extract_or_default"><span class="identifier">extract_or_default</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 522                          <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 523     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 524       <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">result_of::extract_or_default</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">DefaultT</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 525       <a class="link" href="boost/log/extract__idm45711348373184.html" title="Function template extract_or_default"><span class="identifier">extract_or_default</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 526                          <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 527     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 528       <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">result_of::extract_or_default</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">DefaultT</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 529       <a class="link" href="boost/log/extract__idm45711348363824.html" title="Function template extract_or_default"><span class="identifier">extract_or_default</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 530                          <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 531     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 532       <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">result_of::extract_or_default</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">DefaultT</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 533       <a class="link" href="boost/log/extract__idm45711348354464.html" title="Function template extract_or_default"><span class="identifier">extract_or_default</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 534     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
 535       <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">result_of::extract</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 536       <a class="link" href="boost/log/extract_idm45711348346320.html" title="Function template extract"><span class="identifier">extract</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 537               <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 538     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
 539       <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">result_of::extract</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 540       <a class="link" href="boost/log/extract_idm45711348338864.html" title="Function template extract"><span class="identifier">extract</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 541               <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 542     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
 543       <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">result_of::extract</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 544       <a class="link" href="boost/log/extract_idm45711348331680.html" title="Function template extract"><span class="identifier">extract</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 545               <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 546     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
 547       <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">result_of::extract_or_throw</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 548       <a class="link" href="boost/log/extract__idm45711348324496.html" title="Function template extract_or_throw"><span class="identifier">extract_or_throw</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 549                        <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 550     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
 551       <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">result_of::extract_or_throw</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 552       <a class="link" href="boost/log/extract__idm45711348316304.html" title="Function template extract_or_throw"><span class="identifier">extract_or_throw</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 553                        <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 554     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">&gt;</span>
 555       <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">result_of::extract_or_throw</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 556       <a class="link" href="boost/log/extract__idm45711348308384.html" title="Function template extract_or_throw"><span class="identifier">extract_or_throw</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 557                        <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 558     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span>
 559              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 560       <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">result_of::extract_or_default</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DefaultT</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 561       <a class="link" href="boost/log/extract__idm45711348300464.html" title="Function template extract_or_default"><span class="identifier">extract_or_default</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 562                          <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 563     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span>
 564              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 565       <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">result_of::extract_or_default</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DefaultT</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 566       <a class="link" href="boost/log/extract__idm45711348291024.html" title="Function template extract_or_default"><span class="identifier">extract_or_default</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 567                          <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 568     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span>
 569              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 570       <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">result_of::extract_or_default</a><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">DescriptorT</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="identifier">DefaultT</span><span class="special">,</span> <span class="identifier">DescriptorT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 571       <a class="link" href="boost/log/extract__idm45711348281856.html" title="Function template extract_or_default"><span class="identifier">extract_or_default</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 572                          <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 573     <span class="keyword">namespace</span> <span class="identifier">result_of</span> <span class="special">{</span>
 574     <span class="special">}</span>
 575   <span class="special">}</span>
 576 <span class="special">}</span></pre>
 577 </div>
 578 <div class="section">
 579 <div class="titlepage"><div><div><h4 class="title">
 580 <a name="header.boost.log.attributes.value_extraction_fwd_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/value_extraction_fwd.hpp" target="_top">boost/log/attributes/value_extraction_fwd.hpp</a>&gt;</h4></div></div></div>
 581 <p>Andrey Semashev </p>
 582 <p>
 583
 584 </p>
 585 <p>01.03.2008</p>
 586 <p>
 587
 588 The header contains forward declaration of tools for extracting attribute values from the view. </p>
 589 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 590   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 591     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> FallbackPolicyT<span class="special">,</span> <span class="keyword">typename</span> TagT<span class="special">&gt;</span>
 592       <span class="keyword">class</span> <a class="link" href="boost/log/value_extractor.html" title="Class template value_extractor">value_extractor</a><span class="special">;</span>
 593     <span class="keyword">namespace</span> <span class="identifier">result_of</span> <span class="special">{</span>
 594       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT<span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="boost/log/result_of/extract.html" title="Struct template extract">extract</a><span class="special">;</span>
 595       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> DefaultT<span class="special">,</span> <span class="keyword">typename</span> TagT<span class="special">&gt;</span>
 596         <span class="keyword">struct</span> <a class="link" href="boost/log/result_of/extract_or_default.html" title="Struct template extract_or_default">extract_or_default</a><span class="special">;</span>
 597       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> TagT<span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="boost/log/result_of/extract_or_throw.html" title="Struct template extract_or_throw">extract_or_throw</a><span class="special">;</span>
 598     <span class="special">}</span>
 599   <span class="special">}</span>
 600 <span class="special">}</span></pre>
 601 </div>
 602 <div class="section">
 603 <div class="titlepage"><div><div><h4 class="title">
 604 <a name="header.boost.log.attributes.value_visitation_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/value_visitation.hpp" target="_top">boost/log/attributes/value_visitation.hpp</a>&gt;</h4></div></div></div>
 605 <p>Andrey Semashev </p>
 606 <p>
 607
 608 </p>
 609 <p>01.03.2008</p>
 610 <p>
 611
 612 The header contains implementation of convenience tools to apply visitors to an attribute value in the view. </p>
 613 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 614   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 615     <span class="keyword">class</span> <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a><span class="special">;</span>
 616     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 617       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 618       <a class="link" href="boost/log/visit_idm45711348203152.html" title="Function template visit"><span class="identifier">visit</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">VisitorT</span><span class="special">)</span><span class="special">;</span>
 619     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 620       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 621       <a class="link" href="boost/log/visit_idm45711348195280.html" title="Function template visit"><span class="identifier">visit</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">VisitorT</span><span class="special">)</span><span class="special">;</span>
 622     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 623       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 624       <a class="link" href="boost/log/visit_idm45711348187680.html" title="Function template visit"><span class="identifier">visit</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_name.html" title="Class attribute_name">attribute_name</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">VisitorT</span><span class="special">)</span><span class="special">;</span>
 625     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 626       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> <a class="link" href="boost/log/visit_idm45711348180080.html" title="Function template visit"><span class="identifier">visit</span></a><span class="special">(</span><a class="link" href="boost/log/attribute_value.html" title="Class attribute_value">attribute_value</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">VisitorT</span><span class="special">)</span><span class="special">;</span>
 627     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span>
 628              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 629       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 630       <a class="link" href="boost/log/visit_idm45711348173696.html" title="Function template visit"><span class="identifier">visit</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 631             <a class="link" href="boost/log/attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">VisitorT</span><span class="special">)</span><span class="special">;</span>
 632     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span>
 633              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 634       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 635       <a class="link" href="boost/log/visit_idm45711348165200.html" title="Function template visit"><span class="identifier">visit</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 636             <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">VisitorT</span><span class="special">)</span><span class="special">;</span>
 637     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span>
 638              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 639       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 640       <a class="link" href="boost/log/visit_idm45711348156976.html" title="Function template visit"><span class="identifier">visit</span></a><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span>
 641             <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">VisitorT</span><span class="special">)</span><span class="special">;</span>
 642   <span class="special">}</span>
 643 <span class="special">}</span></pre>
 644 </div>
 645 <div class="section">
 646 <div class="titlepage"><div><div><h4 class="title">
 647 <a name="header.boost.log.attributes.value_visitation_fwd_hpp"></a>Header &lt;<a href="../../../../boost/log/attributes/value_visitation_fwd.hpp" target="_top">boost/log/attributes/value_visitation_fwd.hpp</a>&gt;</h4></div></div></div>
 648 <p>Andrey Semashev </p>
 649 <p>
 650
 651 </p>
 652 <p>01.03.2008</p>
 653 <p>
 654
 655 The header contains forward declaration of convenience tools to apply visitors to an attribute value in the view. </p>
 656 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 657   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 658     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> FallbackPolicyT<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="boost/log/value_visitor_invoker.html" title="Class template value_visitor_invoker">value_visitor_invoker</a><span class="special">;</span>
 659   <span class="special">}</span>
 660 <span class="special">}</span></pre>
 661 </div>
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