boost/tti/has_member_function.hpp
// (C) Copyright Edward Diener 2011,2012,2013 // Use, modification and distribution are subject to the Boost Software License, // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt). #if !defined(BOOST_TTI_HAS_MEMBER_FUNCTION_HPP) #define BOOST_TTI_HAS_MEMBER_FUNCTION_HPP #include <boost/config.hpp> #include <boost/function_types/property_tags.hpp> #include <boost/mpl/vector.hpp> #include <boost/preprocessor/cat.hpp> #include <boost/tti/detail/ddeftype.hpp> #include <boost/tti/detail/dmem_fun.hpp> #include <boost/tti/gen/has_member_function_gen.hpp> #include <boost/tti/gen/namespace_gen.hpp> /* The succeeding comments in this file are in doxygen format. */ /** \file */ /// Expands to a metafunction which tests whether a member function with a particular name and signature exists. /** trait = the name of the metafunction within the tti namespace. name = the name of the inner member. generates a metafunction called "trait" where 'trait' is the macro parameter.<br /> template<class BOOST_TTI_TP_T,class BOOST_TTI_R,class BOOST_TTI_FS,class BOOST_TTI_TAG> struct trait { static const value = unspecified; typedef mpl::bool_<true-or-false> type; }; The metafunction types and return: BOOST_TTI_TP_T = the enclosing type in which to look for our 'name' OR a pointer to member function as a single type. BOOST_TTI_TP_R = (optional) the return type of the member function if the first parameter is the enclosing type. BOOST_TTI_TP_FS = (optional) the parameters of the member function as a boost::mpl forward sequence if the first parameter is the enclosing type and the member function parameters are not empty. BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the member function if the first parameter is the enclosing type and a tag is needed. returns = 'value' is true if the 'name' exists, with the appropriate member function type, otherwise 'value' is false. */ #define BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION(trait,name) \ BOOST_TTI_DETAIL_TRAIT_HAS_MEMBER_FUNCTION(trait,name) \ template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R = BOOST_TTI_NAMESPACE::detail::deftype,class BOOST_TTI_TP_FS = boost::mpl::vector<>,class BOOST_TTI_TP_TAG = boost::function_types::null_tag> \ struct trait \ { \ typedef typename \ BOOST_PP_CAT(trait,_detail_hmf)<BOOST_TTI_TP_T,BOOST_TTI_TP_R,BOOST_TTI_TP_FS,BOOST_TTI_TP_TAG>::type type; \ BOOST_STATIC_CONSTANT(bool,value=type::value); \ }; \ /**/ /// Expands to a metafunction which tests whether a member function with a particular name and signature exists. /** name = the name of the inner member. generates a metafunction called "has_member_function_name" where 'name' is the macro parameter. template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG> struct has_member_function_name { static const value = unspecified; typedef mpl::bool_<true-or-false> type; }; The metafunction types and return: BOOST_TTI_TP_T = the enclosing type in which to look for our 'name' OR a pointer to member function as a single type. BOOST_TTI_TP_R = (optional) the return type of the member function if the first parameter is the enclosing type. BOOST_TTI_TP_FS = (optional) the parameters of the member function as a boost::mpl forward sequence if the first parameter is the enclosing type and the member function parameters are not empty. BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the member function if the first parameter is the enclosing type and a tag is needed. returns = 'value' is true if the 'name' exists, with the appropriate member function type, otherwise 'value' is false. */ #define BOOST_TTI_HAS_MEMBER_FUNCTION(name) \ BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION \ ( \ BOOST_TTI_HAS_MEMBER_FUNCTION_GEN(name), \ name \ ) \ /**/ #endif // BOOST_TTI_HAS_MEMBER_FUNCTION_HPP