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  21 <h2><span class="refentrytitle">Struct keyword_descriptor</span></h2>
  22 <p>boost::log::expressions::keyword_descriptor</p>
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  24 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  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.is_keyword_descriptor_hpp" title="Header &lt;boost/log/expressions/is_keyword_descriptor.hpp&gt;">boost/log/expressions/is_keyword_descriptor.hpp</a>&gt;
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  28 <span class="keyword">struct</span> <a class="link" href="keyword_descriptor.html" title="Struct keyword_descriptor">keyword_descriptor</a> <span class="special">{</span>
  29 <span class="special">}</span><span class="special">;</span></pre></div>
  30 <div class="refsect1">
  31 <a name="idm45554743948096"></a><h2>Description</h2>
  32 <p>Base class for keyword descriptors. All keyword descriptors must derive from this class to support the <code class="computeroutput"><a class="link" href="is_keyword_descriptor.html" title="Struct template is_keyword_descriptor">is_keyword_descriptor</a></code> trait. </p>
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