110 lines
4.2 KiB
C++
110 lines
4.2 KiB
C++
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// (C) Copyright Edward Diener 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_FUNCTION_HPP)
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#define BOOST_TTI_HAS_FUNCTION_HPP
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#include <boost/config.hpp>
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#include <boost/function_types/property_tags.hpp>
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#include <boost/mpl/vector.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/tti/detail/dfunction.hpp>
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#include <boost/tti/gen/has_function_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 function or a static member function with a particular name and signature exists.
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/**
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trait = the name of the metafunction within the tti namespace.
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name = the name of the inner member.
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generates a metafunction called "trait" where 'trait' is the macro parameter.
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template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
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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_T = the enclosing type in which to look for our 'name'.
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BOOST_TTI_TP_R = the return type of the function
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BOOST_TTI_TP_FS = (optional) the parameters of the function as a boost::mpl forward sequence
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if function parameters are not empty.
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BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
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if the need for a tag exists.
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returns = 'value' is true if the 'name' exists,
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with the appropriate static member function type,
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otherwise 'value' is false.
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*/
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#define BOOST_TTI_TRAIT_HAS_FUNCTION(trait,name) \
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BOOST_TTI_DETAIL_TRAIT_HAS_FUNCTION(trait,name) \
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template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS = boost::mpl::vector<>,class BOOST_TTI_TP_TAG = boost::function_types::null_tag> \
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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_hf)<BOOST_TTI_TP_T,BOOST_TTI_TP_R,BOOST_TTI_TP_FS,BOOST_TTI_TP_TAG>::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 function or a static member function with a particular name and signature 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_function_name" where 'name' is the macro parameter.
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template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
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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_T = the enclosing type in which to look for our 'name'.
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BOOST_TTI_TP_R = the return type of the function
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BOOST_TTI_TP_FS = (optional) the parameters of the function as a boost::mpl forward sequence
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if function parameters are not empty.
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BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
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if the need for a tag exists.
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returns = 'value' is true if the 'name' exists,
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with the appropriate function type,
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otherwise 'value' is false.
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*/
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#define BOOST_TTI_HAS_FUNCTION(name) \
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BOOST_TTI_TRAIT_HAS_FUNCTION \
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( \
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BOOST_TTI_HAS_FUNCTION_GEN(name), \
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name \
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) \
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/**/
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#endif // BOOST_TTI_HAS_FUNCTION_HPP
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