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107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
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// (C) Copyright Edward Diener 2011,2012,2013
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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#if !defined(BOOST_TTI_HAS_MEMBER_DATA_HPP)
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#define BOOST_TTI_HAS_MEMBER_DATA_HPP
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#include <boost/config.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/tti/detail/ddeftype.hpp>
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#include <boost/tti/detail/dmem_data.hpp>
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#include <boost/tti/gen/has_member_data_gen.hpp>
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/*
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The succeeding comments in this file are in doxygen format.
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*/
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/** \file
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*/
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/// Expands to a metafunction which tests whether a member data with a particular name and type exists.
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/**
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trait = the name of the metafunction.
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name = the name of the inner member to introspect.
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generates a metafunction called "trait" where 'trait' is the macro parameter.
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template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
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struct trait
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{
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static const value = unspecified;
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typedef mpl::bool_<true-or-false> type;
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};
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The metafunction types and return:
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BOOST_TTI_TP_ET = the enclosing type in which to look for our 'name'
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OR
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The type of the member data in the form of a pointer
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to member data.
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BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
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parameter is the enclosing type.
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returns = 'value' is true if the 'name' exists, with the correct data type,
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otherwise 'value' is false.
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*/
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#define BOOST_TTI_TRAIT_HAS_MEMBER_DATA(trait,name) \
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BOOST_TTI_DETAIL_TRAIT_HAS_MEMBER_DATA(trait,name) \
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template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE = BOOST_TTI_NAMESPACE::detail::deftype> \
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struct trait \
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{ \
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typedef typename \
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BOOST_PP_CAT(trait,_detail_hmd) \
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< \
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BOOST_TTI_TP_ET, \
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BOOST_TTI_TP_TYPE \
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>::type type; \
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BOOST_STATIC_CONSTANT(bool,value=type::value); \
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}; \
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/**/
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/// Expands to a metafunction which tests whether a member data with a particular name and type exists.
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/**
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name = the name of the inner member.
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generates a metafunction called "has_member_data_name" where 'name' is the macro parameter.
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template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
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struct has_member_data_name
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{
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static const value = unspecified;
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typedef mpl::bool_<true-or-false> type;
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};
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The metafunction types and return:
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BOOST_TTI_TP_ET = the enclosing type in which to look for our 'name'
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OR
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The type of the member data in the form of a pointer
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to member data.
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BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
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parameter is the enclosing type.
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returns = 'value' is true if the 'name' exists, with the correct data type,
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otherwise 'value' is false.
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*/
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#define BOOST_TTI_HAS_MEMBER_DATA(name) \
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BOOST_TTI_TRAIT_HAS_MEMBER_DATA \
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( \
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BOOST_TTI_HAS_MEMBER_DATA_GEN(name), \
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name \
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) \
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/**/
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#endif // BOOST_TTI_HAS_MEMBER_DATA_HPP
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