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  1. <html>
    2. 

  2. <head>
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  3. <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
    4. 

  4. <title>Attributes</title>
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  13. <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td></tr></table>
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  14. <hr>
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  16. <a accesskey="p" href="boost/log/swap_idm45711350374912.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="log/reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost/log/attribute.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
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  18. <div class="section">
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  19. <div class="titlepage"><div><div><h3 class="title">
    20. 

  20. <a name="attributes"></a>Attributes</h3></div></div></div>
    21. 

  21. <div class="toc"><dl class="toc">
    22. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  47. </dl></div>
    48. 

  48. <div class="section">
    49. 

  49. <div class="titlepage"><div><div><h4 class="title">
    50. 

  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. 

  51. <p>Andrey Semashev </p>
    52. 

  52. <p>
    53. 

  53. 

  54. </p>
    55. 

  55. <p>15.04.2007</p>
    56. 

  56. <p>
    57. 

  57. 

  58. The header contains attribute interface definition. </p>
    59. 

  59. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    60. 

  60.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    61. 

  61.     <span class="keyword">class</span> <a class="link" href="boost/log/attribute.html" title="Class attribute">attribute</a><span class="special">;</span>
    62. 

  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. 

  63.   <span class="special">}</span>
    64. 

  64. <span class="special">}</span></pre>
    65. 

  65. </div>
    66. 

  66. <div class="section">
    67. 

  67. <div class="titlepage"><div><div><h4 class="title">
    68. 

  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. 

  69. <p>Andrey Semashev </p>
    70. 

  70. <p>
    71. 

  71. 

  72. </p>
    73. 

  73. <p>06.08.2010</p>
    74. 

  74. <p>
    75. 

  75. 

  76. The header contains utilities for casting between attribute factories. </p>
    77. 

  77. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    78. 

  78.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    79. 

  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. 

  80.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    81. 

  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. 

  82.     <span class="special">}</span>
    83. 

  83.   <span class="special">}</span>
    84. 

  84. <span class="special">}</span></pre>
    85. 

  85. </div>
    86. 

  86. <div class="section">
    87. 

  87. <div class="titlepage"><div><div><h4 class="title">
    88. 

  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. 

  89. <p>Andrey Semashev </p>
    90. 

  90. <p>
    91. 

  91. 

  92. </p>
    93. 

  93. <p>28.06.2010</p>
    94. 

  94. <p>
    95. 

  95. 

  96. The header contains attribute name interface definition. </p>
    97. 

  97. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    98. 

  98.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    99. 

  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. 

  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. 

  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. 

  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. 

  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. 

  104.   <span class="special">}</span>
    105. 

  105. <span class="special">}</span></pre>
    106. 

  106. </div>
    107. 

  107. <div class="section">
    108. 

  108. <div class="titlepage"><div><div><h4 class="title">
    109. 

  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. 

  110. <p>Andrey Semashev </p>
    111. 

  111. <p>
    112. 

  112. 

  113. </p>
    114. 

  114. <p>08.03.2007</p>
    115. 

  115. <p>
    116. 

  116. 

  117. This header contains definition of the attribute set container. </p>
    118. 

  118. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    119. 

  119.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    120. 

  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. 

  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. 

  122.   <span class="special">}</span>
    123. 

  123. <span class="special">}</span></pre>
    124. 

  124. </div>
    125. 

  125. <div class="section">
    126. 

  126. <div class="titlepage"><div><div><h4 class="title">
    127. 

  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. 

  128. <p>Andrey Semashev </p>
    129. 

  129. <p>
    130. 

  130. 

  131. </p>
    132. 

  132. <p>21.05.2010</p>
    133. 

  133. <p>
    134. 

  134. 

  135. The header contains <code class="computeroutput">attribute_value</code> class definition. </p>
    136. 

  136. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    137. 

  137.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    138. 

  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. 

  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. 

  140.   <span class="special">}</span>
    141. 

  141. <span class="special">}</span></pre>
    142. 

  142. </div>
    143. 

  143. <div class="section">
    144. 

  144. <div class="titlepage"><div><div><h4 class="title">
    145. 

  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. 

  146. <p>Andrey Semashev </p>
    147. 

  147. <p>
    148. 

  148. 

  149. </p>
    150. 

  150. <p>24.06.2007</p>
    151. 

  151. <p>
    152. 

  152. 

  153. The header contains an implementation of a basic attribute value implementation class. </p>
    154. 

  154. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    155. 

  155.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    156. 

  156.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    157. 

  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. 

  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. 

  159.     <span class="special">}</span>
    160. 

  160.   <span class="special">}</span>
    161. 

  161. <span class="special">}</span></pre>
    162. 

  162. </div>
    163. 

  163. <div class="section">
    164. 

  164. <div class="titlepage"><div><div><h4 class="title">
    165. 

  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. 

  166. <p>Andrey Semashev </p>
    167. 

  167. <p>
    168. 

  168. 

  169. </p>
    170. 

  170. <p>21.04.2007</p>
    171. 

  171. <p>
    172. 

  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. 

  174. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    175. 

  175.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    176. 

  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. 

  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. 

  178.   <span class="special">}</span>
    179. 

  179. <span class="special">}</span></pre>
    180. 

  180. </div>
    181. 

  181. <div class="section">
    182. 

  182. <div class="titlepage"><div><div><h4 class="title">
    183. 

  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. 

  184. <p>Andrey Semashev </p>
    185. 

  185. <p>
    186. 

  186. 

  187. </p>
    188. 

  188. <p>01.12.2007</p>
    189. 

  189. <p>
    190. 

  190. 

  191. The header contains wall clock attribute implementation and typedefs. </p>
    192. 

  192. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    193. 

  193.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    194. 

  194.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    195. 

  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. 

  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. 

  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. 

  199.     <span class="special">}</span>
    200. 

  200.   <span class="special">}</span>
    201. 

  201. <span class="special">}</span></pre>
    202. 

  202. </div>
    203. 

  203. <div class="section">
    204. 

  204. <div class="titlepage"><div><div><h4 class="title">
    205. 

  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. 

  206. <p>Andrey Semashev </p>
    207. 

  207. <p>
    208. 

  208. 

  209. </p>
    210. 

  210. <p>15.04.2007</p>
    211. 

  211. <p>
    212. 

  212. 

  213. The header contains implementation of a constant attribute. </p>
    214. 

  214. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    215. 

  215.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    216. 

  216.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    217. 

  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. 

  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. 

  219.     <span class="special">}</span>
    220. 

  220.   <span class="special">}</span>
    221. 

  221. <span class="special">}</span></pre>
    222. 

  222. </div>
    223. 

  223. <div class="section">
    224. 

  224. <div class="titlepage"><div><div><h4 class="title">
    225. 

  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. 

  226. <p>Andrey Semashev </p>
    227. 

  227. <p>
    228. 

  228. 

  229. </p>
    230. 

  230. <p>01.05.2007</p>
    231. 

  231. <p>
    232. 

  232. 

  233. The header contains implementation of the counter attribute. </p>
    234. 

  234. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    235. 

  235.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    236. 

  236.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    237. 

  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. 

  238.     <span class="special">}</span>
    239. 

  239.   <span class="special">}</span>
    240. 

  240. <span class="special">}</span></pre>
    241. 

  241. </div>
    242. 

  242. <div class="section">
    243. 

  243. <div class="titlepage"><div><div><h4 class="title">
    244. 

  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. 

  245. <p>Andrey Semashev </p>
    246. 

  246. <p>
    247. 

  247. 

  248. </p>
    249. 

  249. <p>12.09.2009</p>
    250. 

  250. <p>
    251. 

  251. 

  252. The header contains implementation of a current process id attribute </p>
    253. 

  253. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    254. 

  254.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    255. 

  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. 

  256.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    257. 

  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. 

  258.     <span class="special">}</span>
    259. 

  259.   <span class="special">}</span>
    260. 

  260. <span class="special">}</span></pre>
    261. 

  261. </div>
    262. 

  262. <div class="section">
    263. 

  263. <div class="titlepage"><div><div><h4 class="title">
    264. 

  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. 

  265. <p>Andrey Semashev </p>
    266. 

  266. <p>
    267. 

  267. 

  268. </p>
    269. 

  269. <p>29.07.2012</p>
    270. 

  270. <p>
    271. 

  271. 

  272. The header contains implementation of a current process name attribute </p>
    273. 

  273. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    274. 

  274.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    275. 

  275.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    276. 

  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. 

  277.     <span class="special">}</span>
    278. 

  278.   <span class="special">}</span>
    279. 

  279. <span class="special">}</span></pre>
    280. 

  280. </div>
    281. 

  281. <div class="section">
    282. 

  282. <div class="titlepage"><div><div><h4 class="title">
    283. 

  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. 

  284. <p>Andrey Semashev </p>
    285. 

  285. <p>
    286. 

  286. 

  287. </p>
    288. 

  288. <p>12.09.2009</p>
    289. 

  289. <p>
    290. 

  290. 

  291. The header contains implementation of a current thread id attribute </p>
    292. 

  292. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    293. 

  293.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    294. 

  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. 

  295.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    296. 

  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. 

  297.     <span class="special">}</span>
    298. 

  298.   <span class="special">}</span>
    299. 

  299. <span class="special">}</span></pre>
    300. 

  300. </div>
    301. 

  301. <div class="section">
    302. 

  302. <div class="titlepage"><div><div><h4 class="title">
    303. 

  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. 

  304. <p>Andrey Semashev </p>
    305. 

  305. <p>
    306. 

  306. 

  307. </p>
    308. 

  308. <p>18.08.2012</p>
    309. 

  309. <p>
    310. 

  310. 

  311. The header contains definition of fallback policies when attribute value visitation or extraction fails. </p>
    312. 

  312. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    313. 

  313.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    314. 

  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. 

  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. 

  316.   <span class="special">}</span>
    317. 

  317. <span class="special">}</span></pre>
    318. 

  318. </div>
    319. 

  319. <div class="section">
    320. 

  320. <div class="titlepage"><div><div><h4 class="title">
    321. 

  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. 

  322. <p>Andrey Semashev </p>
    323. 

  323. <p>
    324. 

  324. 

  325. </p>
    326. 

  326. <p>18.08.2012</p>
    327. 

  327. <p>
    328. 

  328. 

  329. The header contains forward declaration of fallback policies when attribute value visitation or extraction fails. </p>
    330. 

  330. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    331. 

  331.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    332. 

  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. 

  333.   <span class="special">}</span>
    334. 

  334. <span class="special">}</span></pre>
    335. 

  335. </div>
    336. 

  336. <div class="section">
    337. 

  337. <div class="titlepage"><div><div><h4 class="title">
    338. 

  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. 

  339. <p>Andrey Semashev </p>
    340. 

  340. <p>
    341. 

  341. 

  342. </p>
    343. 

  343. <p>24.06.2007</p>
    344. 

  344. <p>
    345. 

  345. 

  346. The header contains implementation of an attribute that calls a third-party function on value acquisition. </p>
    347. 

  347. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    348. 

  348.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    349. 

  349.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    350. 

  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. 

  351.       <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> 
    352. 

  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. 

  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. 

  354.     <span class="special">}</span>
    355. 

  355.   <span class="special">}</span>
    356. 

  356. <span class="special">}</span></pre>
    357. 

  357. </div>
    358. 

  358. <div class="section">
    359. 

  359. <div class="titlepage"><div><div><h4 class="title">
    360. 

  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. 

  361. <p>Andrey Semashev </p>
    362. 

  362. <p>
    363. 

  363. 

  364. </p>
    365. 

  365. <p>06.11.2007</p>
    366. 

  366. <p>
    367. 

  367. 

  368. The header contains implementation of a mutable constant attribute. </p>
    369. 

  369. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    370. 

  370.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    371. 

  371.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    372. 

  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. 

  373.                <span class="keyword">typename</span> ScopedWriteLockT <span class="special">=</span> <span class="keyword">auto</span><span class="special">,</span> 
    374. 

  374.                <span class="keyword">typename</span> ScopedReadLockT <span class="special">=</span> <span class="keyword">auto</span><span class="special">&gt;</span> 
    375. 

  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. 

  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. 

  378.     <span class="special">}</span>
    379. 

  379.   <span class="special">}</span>
    380. 

  380. <span class="special">}</span></pre>
    381. 

  381. </div>
    382. 

  382. <div class="section">
    383. 

  383. <div class="titlepage"><div><div><h4 class="title">
    384. 

  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. 

  385. <p>Andrey Semashev </p>
    386. 

  386. <p>
    387. 

  387. 

  388. </p>
    389. 

  389. <p>24.06.2007</p>
    390. 

  390. <p>
    391. 

  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. 

  393. <pre class="synopsis">
    394. 

  394. 

  395. <a class="link" href="BOOST_LOG_NAMED_SCOPE.html" title="Macro BOOST_LOG_NAMED_SCOPE">BOOST_LOG_NAMED_SCOPE</a>(name)
    396. 

  396. <a class="link" href="BOOST_LOG_FUNCTION.html" title="Macro BOOST_LOG_FUNCTION">BOOST_LOG_FUNCTION</a>()
    397. 

  397. <a class="link" href="BOOST_LOG_FUNC.html" title="Macro BOOST_LOG_FUNC">BOOST_LOG_FUNC</a>()</pre>
    398. 

  398. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    399. 

  399.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    400. 

  400.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    401. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  410.     <span class="special">}</span>
    411. 

  411.   <span class="special">}</span>
    412. 

  412. <span class="special">}</span></pre>
    413. 

  413. </div>
    414. 

  414. <div class="section">
    415. 

  415. <div class="titlepage"><div><div><h4 class="title">
    416. 

  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. 

  417. <p>Andrey Semashev </p>
    418. 

  418. <p>
    419. 

  419. 

  420. </p>
    421. 

  421. <p>13.05.2007</p>
    422. 

  422. <p>
    423. 

  423. 

  424. The header contains definition of facilities to define scoped attributes. </p>
    425. 

  425. <pre class="synopsis">
    426. 

  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. 

  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. 

  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. 

  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. 

  431. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    432. 

  432.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    433. 

  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. 

  434.     <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> LoggerT<span class="special">&gt;</span> 
    435. 

  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. 

  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. 

  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. 

  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. 

  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. 

  440.   <span class="special">}</span>
    441. 

  441. <span class="special">}</span></pre>
    442. 

  442. </div>
    443. 

  443. <div class="section">
    444. 

  444. <div class="titlepage"><div><div><h4 class="title">
    445. 

  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. 

  446. <p>Andrey Semashev </p>
    447. 

  447. <p>
    448. 

  448. 

  449. </p>
    450. 

  450. <p>01.12.2007</p>
    451. 

  451. <p>
    452. 

  452. 

  453. The header contains implementation of time traits that are used in various parts of the library to acquire current time. </p>
    454. 

  454. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    455. 

  455.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    456. 

  456.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    457. 

  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. 

  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. 

  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. 

  460.     <span class="special">}</span>
    461. 

  461.   <span class="special">}</span>
    462. 

  462. <span class="special">}</span></pre>
    463. 

  463. </div>
    464. 

  464. <div class="section">
    465. 

  465. <div class="titlepage"><div><div><h4 class="title">
    466. 

  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. 

  467. <p>Andrey Semashev </p>
    468. 

  468. <p>
    469. 

  469. 

  470. </p>
    471. 

  471. <p>02.12.2007</p>
    472. 

  472. <p>
    473. 

  473. 

  474. The header contains implementation of a stop watch attribute. </p>
    475. 

  475. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    476. 

  476.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    477. 

  477.     <span class="keyword">namespace</span> <span class="identifier">attributes</span> <span class="special">{</span>
    478. 

  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. 

  479.     <span class="special">}</span>
    480. 

  480.   <span class="special">}</span>
    481. 

  481. <span class="special">}</span></pre>
    482. 

  482. </div>
    483. 

  483. <div class="section">
    484. 

  484. <div class="titlepage"><div><div><h4 class="title">
    485. 

  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. 

  486. <p>Andrey Semashev </p>
    487. 

  487. <p>
    488. 

  488. 

  489. </p>
    490. 

  490. <p>01.03.2008</p>
    491. 

  491. <p>
    492. 

  492. 

  493. The header contains implementation of tools for extracting an attribute value from the view. </p>
    494. 

  494. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    495. 

  495.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    496. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  559.              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span> 
    560. 

  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. 

  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. 

  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. 

  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. 

  564.              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span> 
    565. 

  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. 

  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. 

  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. 

  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. 

  569.              <span class="keyword">typename</span> DefaultT<span class="special">&gt;</span> 
    570. 

  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. 

  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. 

  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. 

  573.     <span class="keyword">namespace</span> <span class="identifier">result_of</span> <span class="special">{</span>
    574. 

  574.     <span class="special">}</span>
    575. 

  575.   <span class="special">}</span>
    576. 

  576. <span class="special">}</span></pre>
    577. 

  577. </div>
    578. 

  578. <div class="section">
    579. 

  579. <div class="titlepage"><div><div><h4 class="title">
    580. 

  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. 

  581. <p>Andrey Semashev </p>
    582. 

  582. <p>
    583. 

  583. 

  584. </p>
    585. 

  585. <p>01.03.2008</p>
    586. 

  586. <p>
    587. 

  587. 

  588. The header contains forward declaration of tools for extracting attribute values from the view. </p>
    589. 

  589. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    590. 

  590.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    591. 

  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. 

  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. 

  593.     <span class="keyword">namespace</span> <span class="identifier">result_of</span> <span class="special">{</span>
    594. 

  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. 

  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. 

  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. 

  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. 

  598.     <span class="special">}</span>
    599. 

  599.   <span class="special">}</span>
    600. 

  600. <span class="special">}</span></pre>
    601. 

  601. </div>
    602. 

  602. <div class="section">
    603. 

  603. <div class="titlepage"><div><div><h4 class="title">
    604. 

  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. 

  605. <p>Andrey Semashev </p>
    606. 

  606. <p>
    607. 

  607. 

  608. </p>
    609. 

  609. <p>01.03.2008</p>
    610. 

  610. <p>
    611. 

  611. 

  612. The header contains implementation of convenience tools to apply visitors to an attribute value in the view. </p>
    613. 

  613. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    614. 

  614.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    615. 

  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. 

  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. 

  617.       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> 
    618. 

  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. 

  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. 

  620.       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> 
    621. 

  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. 

  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. 

  623.       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> 
    624. 

  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. 

  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. 

  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. 

  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. 

  628.              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span> 
    629. 

  629.       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> 
    630. 

  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. 

  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. 

  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. 

  633.              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span> 
    634. 

  634.       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> 
    635. 

  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. 

  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. 

  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. 

  638.              <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span> 
    639. 

  639.       <a class="link" href="boost/log/visitation_result.html" title="Class visitation_result">visitation_result</a> 
    640. 

  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. 

  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. 

  642.   <span class="special">}</span>
    643. 

  643. <span class="special">}</span></pre>
    644. 

  644. </div>
    645. 

  645. <div class="section">
    646. 

  646. <div class="titlepage"><div><div><h4 class="title">
    647. 

  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. 

  648. <p>Andrey Semashev </p>
    649. 

  649. <p>
    650. 

  650. 

  651. </p>
    652. 

  652. <p>01.03.2008</p>
    653. 

  653. <p>
    654. 

  654. 

  655. The header contains forward declaration of convenience tools to apply visitors to an attribute value in the view. </p>
    656. 

  656. <pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
    657. 

  657.   <span class="keyword">namespace</span> <span class="identifier">log</span> <span class="special">{</span>
    658. 

  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. 

  659.   <span class="special">}</span>
    660. 

  660. <span class="special">}</span></pre>
    661. 

  661. </div>
    662. 

  662. </div>
    663. 

  663. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    664. 

  664. <td align="left"></td>
    665. 

  665. <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
    666. 

  666.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    667. 

  667.         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>).
    668. 

  668.       </p>
    669. 

  669. </div></td>
    670. 

  670. </tr></table>
    671. 

  671. <hr>
    672. 

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    673. 

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    677.