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- <h2><span class="refentrytitle">Macro BOOST_TTI_MEMBER_TYPE</span></h2>
- <p>BOOST_TTI_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>
- <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>>
- </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<class BOOST_TTI_TP_T,class BOOST_TTI_TP_MARKER_TYPE = boost::tti::detail::notype>
- 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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