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<h2><span class="refentrytitle">Macro BOOST_TTI_TRAIT_MEMBER_TYPE</span></h2>
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<p>BOOST_TTI_TRAIT_MEMBER_TYPE — 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>
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<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="header/boost/tti/member_type_hpp.html" title="Header <boost/tti/member_type.hpp>">boost/tti/member_type.hpp</a>>
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</span>BOOST_TTI_TRAIT_MEMBER_TYPE(trait, name)</pre></div>
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<div class="refsect1">
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<a name="idm45944205375552"></a><h2>Description</h2>
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<p>trait = the name of the metafunction within the tti namespace.</p>
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<p>name = the name of the inner type.</p>
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<p>generates a metafunction called "trait" where 'trait' is the macro parameter. template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_MARKER_TYPE = boost::tti::detail::notype>
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struct trait
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{
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typedef unspecified type;
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typedef BOOST_TTI_TP_MARKER_TYPE boost_tti_marker_type;
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};
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The metafunction types and return:
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BOOST_TTI_TP_T = the enclosing type.
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BOOST_TTI_TP_MARKER_TYPE = (optional) a type to use as the marker type.
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defaults to the internal boost::tti::detail::notype.
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returns = 'type' is the inner type of 'name' if the inner type exists
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within the enclosing type, else 'type' is a marker type.
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if the end-user does not specify a marker type then
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an internal boost::tti::detail::notype marker type is used.
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The metafunction also encapsulates the type of the marker type as
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a nested 'boost_tti_marker_type'.
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</p>
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<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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<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Tropic Software
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East Inc<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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