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  19 <div class="titlepage"><div><div><h3 class="title">
  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>
  27 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.attribute_value_impl_hpp">Header &lt;boost/log/attributes/attribute_value_impl.hpp&gt;</a></span></dt>
  28 <dt><span class="section"><a href="attributes.html#header.boost.log.attributes.attribute_value_set_hpp">Header &lt;boost/log/attributes/attribute_value_set.hpp&gt;</a></span></dt>
  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 </p>
  54 <p>15.04.2007</p>
  55 <p>
  56 The header contains attribute interface definition. </p>
  57 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  58   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
  59     <span class="keyword">class</span> <a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a><span class="special">;</span>
  60     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idp35147072.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>
  61   <span class="special">}</span>
  62 <span class="special">}</span></pre>
  63 </div>
  64 <div class="section">
  65 <div class="titlepage"><div><div><h4 class="title">
  66 <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>
  67 <p>Andrey Semashev </p>
  68 <p>
  69 </p>
  70 <p>06.08.2010</p>
  71 <p>
  72 The header contains utilities for casting between attribute factories. </p>
  73 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  74   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
  75     <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>
  76     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
  77       <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>
  78     <span class="special">}</span>
  79   <span class="special">}</span>
  80 <span class="special">}</span></pre>
  81 </div>
  82 <div class="section">
  83 <div class="titlepage"><div><div><h4 class="title">
  84 <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>
  85 <p>Andrey Semashev </p>
  86 <p>
  87 </p>
  88 <p>28.06.2010</p>
  89 <p>
  90 The header contains attribute name interface definition. </p>
  91 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  92   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
  93     <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>
  94     <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>
  95       <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>
  96       <a class="link" href="boost/log/operator_idp35219328.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>
  97                  <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>
  98   <span class="special">}</span>
  99 <span class="special">}</span></pre>
 100 </div>
 101 <div class="section">
 102 <div class="titlepage"><div><div><h4 class="title">
 103 <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>
 104 <p>Andrey Semashev </p>
 105 <p>
 106 </p>
 107 <p>08.03.2007</p>
 108 <p>
 109 This header contains definition of the attribute set container. </p>
 110 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 111   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 112     <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>
 113     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idp35325872.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>
 114   <span class="special">}</span>
 115 <span class="special">}</span></pre>
 116 </div>
 117 <div class="section">
 118 <div class="titlepage"><div><div><h4 class="title">
 119 <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>
 120 <p>Andrey Semashev </p>
 121 <p>
 122 </p>
 123 <p>21.05.2010</p>
 124 <p>
 125 The header contains <code class="computeroutput">attribute_value</code> class definition. </p>
 126 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 127   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 128     <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>
 129     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idp35418816.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>
 130   <span class="special">}</span>
 131 <span class="special">}</span></pre>
 132 </div>
 133 <div class="section">
 134 <div class="titlepage"><div><div><h4 class="title">
 135 <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>
 136 <p>Andrey Semashev </p>
 137 <p>
 138 </p>
 139 <p>24.06.2007</p>
 140 <p>
 141 The header contains an implementation of a basic attribute value implementation class. </p>
 142 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 143   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 144     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 145       <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>
 146       <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>
 147     <span class="special">}</span>
 148   <span class="special">}</span>
 149 <span class="special">}</span></pre>
 150 </div>
 151 <div class="section">
 152 <div class="titlepage"><div><div><h4 class="title">
 153 <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>
 154 <p>Andrey Semashev </p>
 155 <p>
 156 </p>
 157 <p>21.04.2007</p>
 158 <p>
 159 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>
 160 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 161   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 162     <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>
 163     <span class="keyword">void</span> <a class="link" href="boost/log/swap_idp35559088.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>
 164   <span class="special">}</span>
 165 <span class="special">}</span></pre>
 166 </div>
 167 <div class="section">
 168 <div class="titlepage"><div><div><h4 class="title">
 169 <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>
 170 <p>Andrey Semashev </p>
 171 <p>
 172 </p>
 173 <p>01.12.2007</p>
 174 <p>
 175 The header contains wall clock attribute implementation and typedefs. </p>
 176 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 177   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 178     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 179       <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>
 180
 181       <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>
 182       <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>
 183     <span class="special">}</span>
 184   <span class="special">}</span>
 185 <span class="special">}</span></pre>
 186 </div>
 187 <div class="section">
 188 <div class="titlepage"><div><div><h4 class="title">
 189 <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>
 190 <p>Andrey Semashev </p>
 191 <p>
 192 </p>
 193 <p>15.04.2007</p>
 194 <p>
 195 The header contains implementation of a constant attribute. </p>
 196 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 197   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 198     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 199       <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>
 200       <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>
 201     <span class="special">}</span>
 202   <span class="special">}</span>
 203 <span class="special">}</span></pre>
 204 </div>
 205 <div class="section">
 206 <div class="titlepage"><div><div><h4 class="title">
 207 <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>
 208 <p>Andrey Semashev </p>
 209 <p>
 210 </p>
 211 <p>01.05.2007</p>
 212 <p>
 213 The header contains implementation of the counter 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/counter.html" title="Class template counter">counter</a><span class="special">;</span>
 218     <span class="special">}</span>
 219   <span class="special">}</span>
 220 <span class="special">}</span></pre>
 221 </div>
 222 <div class="section">
 223 <div class="titlepage"><div><div><h4 class="title">
 224 <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>
 225 <p>Andrey Semashev </p>
 226 <p>
 227 </p>
 228 <p>12.09.2009</p>
 229 <p>
 230 The header contains implementation of a current process id attribute </p>
 231 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 232   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 233     <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>
 234     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 235       <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>
 236     <span class="special">}</span>
 237   <span class="special">}</span>
 238 <span class="special">}</span></pre>
 239 </div>
 240 <div class="section">
 241 <div class="titlepage"><div><div><h4 class="title">
 242 <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>
 243 <p>Andrey Semashev </p>
 244 <p>
 245 </p>
 246 <p>29.07.2012</p>
 247 <p>
 248 The header contains implementation of a current process name attribute </p>
 249 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 250   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 251     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 252       <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>
 253     <span class="special">}</span>
 254   <span class="special">}</span>
 255 <span class="special">}</span></pre>
 256 </div>
 257 <div class="section">
 258 <div class="titlepage"><div><div><h4 class="title">
 259 <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>
 260 <p>Andrey Semashev </p>
 261 <p>
 262 </p>
 263 <p>12.09.2009</p>
 264 <p>
 265 The header contains implementation of a current thread id attribute </p>
 266 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 267   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 268     <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>
 269     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 270       <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>
 271     <span class="special">}</span>
 272   <span class="special">}</span>
 273 <span class="special">}</span></pre>
 274 </div>
 275 <div class="section">
 276 <div class="titlepage"><div><div><h4 class="title">
 277 <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>
 278 <p>Andrey Semashev </p>
 279 <p>
 280 </p>
 281 <p>18.08.2012</p>
 282 <p>
 283 The header contains definition of fallback policies when attribute value visitation or extraction fails. </p>
 284 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 285   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 286     <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>
 287     <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>
 288   <span class="special">}</span>
 289 <span class="special">}</span></pre>
 290 </div>
 291 <div class="section">
 292 <div class="titlepage"><div><div><h4 class="title">
 293 <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>
 294 <p>Andrey Semashev </p>
 295 <p>
 296 </p>
 297 <p>18.08.2012</p>
 298 <p>
 299 The header contains forward declaration of fallback policies when attribute value visitation or extraction fails. </p>
 300 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 301   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 302     <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>
 303   <span class="special">}</span>
 304 <span class="special">}</span></pre>
 305 </div>
 306 <div class="section">
 307 <div class="titlepage"><div><div><h4 class="title">
 308 <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>
 309 <p>Andrey Semashev </p>
 310 <p>
 311 </p>
 312 <p>24.06.2007</p>
 313 <p>
 314 The header contains implementation of an attribute that calls a third-party function on value acquisition. </p>
 315 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 316   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 317     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 318       <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>
 319       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span>
 320         <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>
 321         <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>
 322     <span class="special">}</span>
 323   <span class="special">}</span>
 324 <span class="special">}</span></pre>
 325 </div>
 326 <div class="section">
 327 <div class="titlepage"><div><div><h4 class="title">
 328 <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>
 329 <p>Andrey Semashev </p>
 330 <p>
 331 </p>
 332 <p>06.11.2007</p>
 333 <p>
 334 The header contains implementation of a mutable constant attribute. </p>
 335 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 336   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 337     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 338       <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>
 339                <span class="keyword">typename</span> ScopedWriteLockT <span class="special">=</span> <span class="keyword">auto</span><span class="special">,</span>
 340                <span class="keyword">typename</span> ScopedReadLockT <span class="special">=</span> <span class="keyword">auto</span><span class="special">&gt;</span>
 341         <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>
 342
 343       <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_consta_idp35791040.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>
 344     <span class="special">}</span>
 345   <span class="special">}</span>
 346 <span class="special">}</span></pre>
 347 </div>
 348 <div class="section">
 349 <div class="titlepage"><div><div><h4 class="title">
 350 <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>
 351 <p>Andrey Semashev </p>
 352 <p>
 353 </p>
 354 <p>24.06.2007</p>
 355 <p>
 356 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>
 357 <pre class="synopsis">
 358
 359 <a class="link" href="BOOST_LOG_NAMED_SCOPE.html" title="Macro BOOST_LOG_NAMED_SCOPE">BOOST_LOG_NAMED_SCOPE</a>(name)
 360 <a class="link" href="BOOST_LOG_FUNCTION.html" title="Macro BOOST_LOG_FUNCTION">BOOST_LOG_FUNCTION</a>()
 361 <a class="link" href="BOOST_LOG_FUNC.html" title="Macro BOOST_LOG_FUNC">BOOST_LOG_FUNC</a>()</pre>
 362 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 363   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 364     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 365       <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>
 366
 367       <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>
 368       <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>
 369       <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>
 370         <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>
 371         <a class="link" href="boost/log/attributes/operator_idp35916224.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>
 372                    <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>
 373     <span class="special">}</span>
 374   <span class="special">}</span>
 375 <span class="special">}</span></pre>
 376 </div>
 377 <div class="section">
 378 <div class="titlepage"><div><div><h4 class="title">
 379 <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>
 380 <p>Andrey Semashev </p>
 381 <p>
 382 </p>
 383 <p>13.05.2007</p>
 384 <p>
 385 The header contains definition of facilities to define scoped attributes. </p>
 386 <pre class="synopsis">
 387
 388 <a class="link" href="BOOST_LOG_SCOP_idp35945008.html" title="Macro BOOST_LOG_SCOPED_LOGGER_ATTR">BOOST_LOG_SCOPED_LOGGER_ATTR</a>(logger, attr_name, attr)
 389 <a class="link" href="BOOST_LOG_SCOP_idp35947392.html" title="Macro BOOST_LOG_SCOPED_LOGGER_TAG">BOOST_LOG_SCOPED_LOGGER_TAG</a>(logger, attr_name, attr_value)
 390 <a class="link" href="BOOST_LOG_SCOP_idp35949776.html" title="Macro BOOST_LOG_SCOPED_THREAD_ATTR">BOOST_LOG_SCOPED_THREAD_ATTR</a>(attr_name, attr)
 391 <a class="link" href="BOOST_LOG_SCOP_idp35951760.html" title="Macro BOOST_LOG_SCOPED_THREAD_TAG">BOOST_LOG_SCOPED_THREAD_TAG</a>(attr_name, attr_value)</pre>
 392 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 393   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 394     <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>
 395     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> LoggerT<span class="special">&gt;</span>
 396       <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="boost/log/add_scoped_log_idp35931872.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>
 397                                               <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>
 398                                               <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>
 399     <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="boost/log/add_scoped_thr_idp35939264.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>
 400                                             <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>
 401   <span class="special">}</span>
 402 <span class="special">}</span></pre>
 403 </div>
 404 <div class="section">
 405 <div class="titlepage"><div><div><h4 class="title">
 406 <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>
 407 <p>Andrey Semashev </p>
 408 <p>
 409 </p>
 410 <p>01.12.2007</p>
 411 <p>
 412 The header contains implementation of time traits that are used in various parts of the library to acquire current time. </p>
 413 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 414   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 415     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 416       <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>
 417       <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>
 418       <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>
 419     <span class="special">}</span>
 420   <span class="special">}</span>
 421 <span class="special">}</span></pre>
 422 </div>
 423 <div class="section">
 424 <div class="titlepage"><div><div><h4 class="title">
 425 <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>
 426 <p>Andrey Semashev </p>
 427 <p>
 428 </p>
 429 <p>02.12.2007</p>
 430 <p>
 431 The header contains implementation of a stop watch attribute. </p>
 432 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 433   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 434     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
 435       <span class="keyword">class</span> <a class="link" href="boost/log/attributes/timer.html" title="Class timer">timer</a><span class="special">;</span>
 436     <span class="special">}</span>
 437   <span class="special">}</span>
 438 <span class="special">}</span></pre>
 439 </div>
 440 <div class="section">
 441 <div class="titlepage"><div><div><h4 class="title">
 442 <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>
 443 <p>Andrey Semashev </p>
 444 <p>
 445 </p>
 446 <p>01.03.2008</p>
 447 <p>
 448 The header contains implementation of tools for extracting an attribute value from the view. </p>
 449 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 450   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 451     <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>
 452       <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>
 453       <a class="link" href="boost/log/extract_idp35987824.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>
 454     <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>
 455       <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>
 456       <a class="link" href="boost/log/extract_idp35995312.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>
 457     <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>
 458       <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>
 459       <a class="link" href="boost/log/extract_idp36002528.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>
 460     <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>
 461       <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_idp36009744.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>
 462     <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>
 463       <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>
 464       <a class="link" href="boost/log/extract_or_thr_idp36015744.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>
 465     <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>
 466       <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>
 467       <a class="link" href="boost/log/extract_or_thr_idp36023968.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>
 468     <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>
 469       <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>
 470       <a class="link" href="boost/log/extract_or_thr_idp36031920.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>
 471     <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>
 472       <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>
 473       <a class="link" href="boost/log/extract_or_thr_idp36039872.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>
 474     <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>
 475       <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>
 476       <a class="link" href="boost/log/extract_or_def_idp36046608.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>
 477                          <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 478     <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>
 479       <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>
 480       <a class="link" href="boost/log/extract_or_def_idp36055920.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>
 481                          <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 482     <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>
 483       <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>
 484       <a class="link" href="boost/log/extract_or_def_idp36064960.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>
 485                          <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 486     <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>
 487       <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>
 488       <a class="link" href="boost/log/extract_or_def_idp36074000.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>
 489     <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>
 490       <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>
 491       <a class="link" href="boost/log/extract_idp36081824.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>
 492               <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>
 493     <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>
 494       <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>
 495       <a class="link" href="boost/log/extract_idp36089120.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>
 496               <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 497     <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>
 498       <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>
 499       <a class="link" href="boost/log/extract_idp36096144.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>
 500               <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 501     <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>
 502       <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>
 503       <a class="link" href="boost/log/extract_or_thr_idp36103168.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>
 504                        <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>
 505     <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>
 506       <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>
 507       <a class="link" href="boost/log/extract_or_thr_idp36111200.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>
 508                        <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
 509     <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>
 510       <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>
 511       <a class="link" href="boost/log/extract_or_thr_idp36118960.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>
 512                        <span class="identifier">record_view</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> 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>
 514              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 515       <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>
 516       <a class="link" href="boost/log/extract_or_def_idp36126720.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>
 517                          <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>
 518     <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>
 519              <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="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>
 521       <a class="link" href="boost/log/extract_or_def_idp36135840.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>
 522                          <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>
 523     <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>
 524              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span>
 525       <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>
 526       <a class="link" href="boost/log/extract_or_def_idp36144688.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>
 527                          <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>
 528     <span class="keyword">namespace</span> <span class="identifier">result_of</span> <span class="special">{</span>
 529     <span class="special">}</span>
 530   <span class="special">}</span>
 531 <span class="special">}</span></pre>
 532 </div>
 533 <div class="section">
 534 <div class="titlepage"><div><div><h4 class="title">
 535 <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>
 536 <p>Andrey Semashev </p>
 537 <p>
 538 </p>
 539 <p>01.03.2008</p>
 540 <p>
 541 The header contains forward declaration of tools for extracting attribute values from the view. </p>
 542 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 543   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 544     <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> <a class="link" href="boost/log/fallback_to_none.html" title="Struct fallback_to_none">fallback_to_none</a><span class="special">,</span>
 545              <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 546       <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>
 547     <span class="keyword">namespace</span> <span class="identifier">result_of</span> <span class="special">{</span>
 548       <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="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> TagT <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
 549         <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>
 550       <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> <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>
 551       <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> <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>
 552     <span class="special">}</span>
 553   <span class="special">}</span>
 554 <span class="special">}</span></pre>
 555 </div>
 556 <div class="section">
 557 <div class="titlepage"><div><div><h4 class="title">
 558 <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>
 559 <p>Andrey Semashev </p>
 560 <p>
 561 </p>
 562 <p>01.03.2008</p>
 563 <p>
 564 The header contains implementation of convenience tools to apply visitors to an attribute value in the view. </p>
 565 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 566   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 567     <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>
 568     <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>
 569       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 570       <a class="link" href="boost/log/visit_idp36224608.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>
 571     <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>
 572       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 573       <a class="link" href="boost/log/visit_idp36232320.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>
 574     <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>
 575       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 576       <a class="link" href="boost/log/visit_idp36239760.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>
 577     <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>
 578       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> <a class="link" href="boost/log/visit_idp36247200.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>
 579     <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>
 580              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 581       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 582       <a class="link" href="boost/log/visit_idp36253424.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>
 583             <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>
 584     <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>
 585              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 586       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 587       <a class="link" href="boost/log/visit_idp36261760.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>
 588             <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>
 589     <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>
 590              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span>
 591       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a>
 592       <a class="link" href="boost/log/visit_idp36269824.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>
 593             <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>
 594   <span class="special">}</span>
 595 <span class="special">}</span></pre>
 596 </div>
 597 <div class="section">
 598 <div class="titlepage"><div><div><h4 class="title">
 599 <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>
 600 <p>Andrey Semashev </p>
 601 <p>
 602 </p>
 603 <p>01.03.2008</p>
 604 <p>
 605 The header contains forward declaration of convenience tools to apply visitors to an attribute value in the view. </p>
 606 <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
 607   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
 608     <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> <a class="link" href="boost/log/fallback_to_none.html" title="Struct fallback_to_none">fallback_to_none</a><span class="special">&gt;</span>
 609       <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>
 610   <span class="special">}</span>
 611 <span class="special">}</span></pre>
 612 </div>
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 616 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
 617         Distributed under the Boost Software License, Version 1.0. (See accompanying
 618         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>).
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