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  21 <h2><span class="refentrytitle">Struct template extract</span></h2>
  22 <p>boost::log::result_of::extract &#8212; A metafunction that allows to acquire the result of the value extraction. </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="../../../attributes.html#header.boost.log.attributes.value_extraction_hpp" title="Header &lt;boost/log/attributes/value_extraction.hpp&gt;">boost/log/attributes/value_extraction.hpp</a>&gt;
  26
  27 </span><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>
  28 <span class="keyword">struct</span> <a class="link" href="extract.html" title="Struct template extract">extract</a> <span class="special">{</span>
  29   <span class="comment">// types</span>
  30   <span class="keyword">typedef</span> <span class="identifier">value_ref</span><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">TagT</span> <span class="special">&gt;</span> <a name="boost.log.result_of.extract.type"></a><span class="identifier">type</span><span class="special">;</span>
  31 <span class="special">}</span><span class="special">;</span></pre></div>
  32 <div class="refsect1">
  33 <a name="idp109256112"></a><h2>Description</h2>
  34 <p>The metafunction results in a type that is in form of <code class="computeroutput">value_ref&lt; T, TagT &gt;</code>. </p>
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  39 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
  40         Distributed under the Boost Software License, Version 1.0. (See accompanying
  41         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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