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<title>Macro BOOST_TTI_MEMBER_TYPE</title>
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<h2><span class="refentrytitle">Macro BOOST_TTI_MEMBER_TYPE</span></h2>
<p>BOOST_TTI_MEMBER_TYPE &#8212; Expands to a metafunction whose typedef 'type' is either the named type or a marker type. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<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;

</span>BOOST_TTI_MEMBER_TYPE(name)</pre></div>
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<a name="idm45456560303504"></a><h2>Description</h2>
<p>name = the name of the inner type.</p>
<p>generates a metafunction called "member_type_name" where 'name' is the macro parameter.       template&lt;class BOOST_TTI_TP_T,class BOOST_TTI_TP_MARKER_TYPE = boost::tti::detail::notype&gt;
      struct member_type_name
        {
        typedef unspecified type;

        typedef BOOST_TTI_TP_MARKER_TYPE boost_tti_marker_type;
        };

      The metafunction types and return:

        BOOST_TTI_TP_T           = the enclosing type.
        BOOST_TTI_TP_MARKER_TYPE = (optional) a type to use as the marker type.
                          defaults to the internal boost::tti::detail::notype.

        returns         = 'type' is the inner type of 'name' if the inner type exists
                          within the enclosing type, else 'type' is a marker type.
                          if the end-user does not specify a marker type then
                          an internal boost::tti::detail::notype marker type is used.

        The metafunction also encapsulates the type of the marker type as
        a nested 'boost_tti_marker_type'.
</p>
<p>The purpose of this macro is to encapsulate the 'name' type as the typedef 'type' of a metafunction, but only if it exists within the enclosing type. This allows for an evaluation of inner type existence, without generating a compiler error, which can be used by other metafunctions in this library. </p>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
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