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  21 <h2><span class="refentrytitle">Struct template has_requirement</span></h2>
  22 <p>boost::log::sinks::has_requirement</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="../../../sinks.html#header.boost.log.sinks.frontend_requirements_hpp" title="Header &lt;boost/log/sinks/frontend_requirements.hpp&gt;">boost/log/sinks/frontend_requirements.hpp</a>&gt;
  26
  27 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> TestedT<span class="special">,</span> <span class="keyword">typename</span> RequiredT<span class="special">&gt;</span>
  28 <span class="keyword">struct</span> <a class="link" href="has_requirement.html" title="Struct template has_requirement">has_requirement</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">is_base_of</span><span class="special">&lt;</span> <span class="identifier">RequiredT</span><span class="special">,</span> <span class="identifier">TestedT</span> <span class="special">&gt;</span> <span class="special">{</span>
  29 <span class="special">}</span><span class="special">;</span></pre></div>
  30 <div class="refsect1">
  31 <a name="idp126431504"></a><h2>Description</h2>
  32 <p>A helper metafunction to check if a requirement is satisfied. The <code class="computeroutput">TestedT</code> template argument should be the type combining one or several requirements and <code class="computeroutput">RequiredT</code> is the requirement to test against. The metafunction will yield a positive result if <code class="computeroutput">TestedT</code> supports <code class="computeroutput">RequiredT</code>. </p>
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  37 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
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