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  28 <h2><span class="refentrytitle">Macro BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION</span></h2>
  29 <p>BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION &#8212; Expands to a metafunction which tests whether a member function with a particular name and signature exists. </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/has_member_function_hpp.html" title="Header &lt;boost/tti/has_member_function.hpp&gt;">boost/tti/has_member_function.hpp</a>&gt;
  33
  34 </span>BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION(trait, name)</pre></div>
  35 <div class="refsect1">
  36 <a name="idp91474768"></a><h2>Description</h2>
  37 <p>trait = the name of the metafunction within the tti namespace.</p>
  38 <p>name = the name of the inner member.</p>
  39 <p>generates a metafunction called "trait" where 'trait' is the macro parameter.<br>
  40        template&lt;class BOOST_TTI_TP_T,class BOOST_TTI_R,class BOOST_TTI_FS,class BOOST_TTI_TAG&gt;
  41       struct trait
  42         {
  43         static const value = unspecified;
  44         typedef mpl::bool_&lt;true-or-false&gt; type;
  45         };
  46
  47       The metafunction types and return:
  48
  49         BOOST_TTI_TP_T   = the enclosing type in which to look for our 'name'
  50                                     OR
  51                   a pointer to member function as a single type.
  52
  53         BOOST_TTI_TP_R   = (optional) the return type of the member function
  54                   if the first parameter is the enclosing type.
  55
  56         BOOST_TTI_TP_FS  = (optional) the parameters of the member function as a boost::mpl forward sequence
  57                   if the first parameter is the enclosing type and the member function parameters
  58                   are not empty.
  59
  60         BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the member function
  61                   if the first parameter is the enclosing type and a tag is needed.
  62
  63         returns = 'value' is true if the 'name' exists,
  64                   with the appropriate member function type,
  65                   otherwise 'value' is false. </p>
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