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  28 <h2><span class="refentrytitle">Struct template valid_member_metafunction</span></h2>
  29 <p>boost::tti::valid_member_metafunction &#8212; A metafunction which checks whether the invoked macro metafunction generated by BOOST_TTI_MEMBER_TYPE ( BOOST_TTI_TRAIT_MEMBER_TYPE ) hold a valid type. </p>
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  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <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="../../header/boost/tti/member_type_hpp.html" title="Header &lt;boost/tti/member_type.hpp&gt;">boost/tti/member_type.hpp</a>&gt;
  33
  34 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> TTI_METAFUNCTION<span class="special">&gt;</span>
  35 <span class="keyword">struct</span> <a class="link" href="valid_member_metafunction.html" title="Struct template valid_member_metafunction">valid_member_metafunction</a> <span class="special">:</span> <span class="keyword">public</span> boost::mpl::not_&lt; boost::is_same&lt; TTI_METAFUNCTION::type, TTI_METAFUNCTION::boost_tti_marker_type &gt; &gt;
  36 <span class="special">{</span>
  37 <span class="special">}</span><span class="special">;</span></pre></div>
  38 <div class="refsect1">
  39 <a name="idm45456560338864"></a><h2>Description</h2>
  40 <p>template&lt;class TTI_METAFUNCTION&gt; struct <a class="link" href="valid_member_metafunction.html" title="Struct template valid_member_metafunction">valid_member_metafunction</a> { static const value = unspecified; typedef mpl::bool_&lt;true-or-false&gt; type; };</p>
  41 <p>The metafunction types and return:</p>
  42 <p>TTI_METAFUNCTION = The invoked macro metafunction generated by BOOST_TTI_MEMBER_TYPE ( BOOST_TTI_TRAIT_MEMBER_TYPE ).</p>
  43 <p>returns = 'value' is true if the nested type of the invoked metafunction is valid, otherwise 'value' is false. A valid type means that the invoked metafunction's inner 'type' is not the marker type. </p>
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