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  4. <title>Macro BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE</title>
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  21. <h2><span class="refentrytitle">Macro BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE</span></h2>
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  22. <p>BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE &#8212; The macro declares an attribute keyword type. </p>
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  24. <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
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  25. <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="expressions.html#header.boost.log.expressions.keyword_hpp" title="Header &lt;boost/log/expressions/keyword.hpp&gt;">boost/log/expressions/keyword.hpp</a>&gt;
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  27. </span>BOOST_LOG_ATTRIBUTE_KEYWORD_TYPE(keyword_, name_, value_type_)</pre></div>
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  28. <div class="refsect1">
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  29. <a name="idm45554743936016"></a><h2>Description</h2>
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  30. <p>The macro should be used at a namespace scope. It expands into an attribute keyword type definition, including the <code class="computeroutput">tag</code> namespace and the keyword tag type within which has the following layout:</p>
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  31. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">tag</span>
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  32. <span class="special">{</span>
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  33.   <span class="keyword">struct</span> <span class="identifier">keyword_</span> <span class="special">:</span>
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  34.     <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">log</span><span class="special">::</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">keyword_descriptor</span>
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  35.   <span class="special">{</span>
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  36.     <span class="keyword">typedef</span> <span class="identifier">value_type_</span> <span class="identifier">value_type</span><span class="special">;</span>
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  37.     <span class="keyword">static</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">log</span><span class="special">::</span><span class="identifier">attribute_name</span> <span class="identifier">get_name</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
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  38.   <span class="special">}</span><span class="special">;</span>
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  39. <span class="special">}</span>
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  40. 

  41. <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">log</span><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">tag</span><span class="special">::</span><span class="identifier">keyword_</span> <span class="special">&gt;</span> <span class="identifier">keyword_type</span><span class="special">;</span>
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  42. </pre>
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  43. <p>The <code class="computeroutput">get_name</code> method returns the attribute name.</p>
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  44. <div class="note"><table border="0" summary="Note">
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  46. <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
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  47. <th align="left">Note</th>
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  49. <tr><td align="left" valign="top"><p>This macro only defines the type of the keyword. To also define the keyword object, use the <code class="computeroutput">BOOST_LOG_ATTRIBUTE_KEYWORD</code> macro instead.</p></td></tr>
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  60. <td><p><span class="term">Parameters:</span></p></td>
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  68. <td><p><span class="term"><code class="computeroutput">keyword_</code></span></p></td>
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  69. <td><p>Keyword name </p></td>
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  70. </tr>
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  72. <td><p><span class="term"><code class="computeroutput">name_</code></span></p></td>
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  73. <td><p>Attribute name string </p></td>
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  76. <td><p><span class="term"><code class="computeroutput">value_type_</code></span></p></td>
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  77. <td><p>Attribute value type </p></td>
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  86. <td align="left"></td>
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  87. <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
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  88.         Distributed under the Boost Software License, Version 1.0. (See accompanying
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  89.         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
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  90.       </p>
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