Chris@16: 
Chris@16: //  (C) Copyright Edward Diener 2012,2013
Chris@16: //  Use, modification and distribution are subject to the Boost Software License,
Chris@16: //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt).
Chris@16: 
Chris@16: #if !defined(BOOST_TTI_HAS_FUNCTION_HPP)
Chris@16: #define BOOST_TTI_HAS_FUNCTION_HPP
Chris@16: 
Chris@101: #include <boost/config.hpp>
Chris@16: #include <boost/function_types/property_tags.hpp>
Chris@16: #include <boost/mpl/vector.hpp>
Chris@16: #include <boost/preprocessor/cat.hpp>
Chris@16: #include <boost/tti/detail/dfunction.hpp>
Chris@16: #include <boost/tti/gen/has_function_gen.hpp>
Chris@16: 
Chris@16: /*
Chris@16: 
Chris@16:   The succeeding comments in this file are in doxygen format.
Chris@16: 
Chris@16: */
Chris@16: 
Chris@16: /** \file
Chris@16: */
Chris@16: 
Chris@16: /// Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists.
Chris@16: /**
Chris@16: 
Chris@16:     trait = the name of the metafunction within the tti namespace.
Chris@16:     
Chris@16:     name  = the name of the inner member.
Chris@16: 
Chris@16:     generates a metafunction called "trait" where 'trait' is the macro parameter.
Chris@16:     
Chris@16:               template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
Chris@16:               struct trait
Chris@16:                 {
Chris@16:                 static const value = unspecified;
Chris@16:                 typedef mpl::bool_<true-or-false> type;
Chris@16:                 };
Chris@16: 
Chris@16:               The metafunction types and return:
Chris@16:     
Chris@16:                 BOOST_TTI_TP_T   = the enclosing type in which to look for our 'name'.
Chris@16:                 
Chris@16:                 BOOST_TTI_TP_R   = the return type of the function
Chris@16:                 
Chris@16:                 BOOST_TTI_TP_FS  = (optional) the parameters of the function as a boost::mpl forward sequence
Chris@16:                           if function parameters are not empty.
Chris@16:                 
Chris@16:                 BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
Chris@16:                           if the need for a tag exists.
Chris@16:                 
Chris@16:                 returns = 'value' is true if the 'name' exists, 
Chris@16:                           with the appropriate static member function type,
Chris@16:                           otherwise 'value' is false.
Chris@16:                           
Chris@16: */
Chris@16: #define BOOST_TTI_TRAIT_HAS_FUNCTION(trait,name) \
Chris@16:   BOOST_TTI_DETAIL_TRAIT_HAS_FUNCTION(trait,name) \
Chris@16:   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> \
Chris@101:   struct trait \
Chris@16:     { \
Chris@101:     typedef typename \
Chris@101:     BOOST_PP_CAT(trait,_detail_hf)<BOOST_TTI_TP_T,BOOST_TTI_TP_R,BOOST_TTI_TP_FS,BOOST_TTI_TP_TAG>::type type; \
Chris@101:     BOOST_STATIC_CONSTANT(bool,value=type::value); \
Chris@16:     }; \
Chris@16: /**/
Chris@16: 
Chris@16: /// Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists.
Chris@16: /**
Chris@16: 
Chris@16:     name  = the name of the inner member.
Chris@16: 
Chris@16:     generates a metafunction called "has_function_name" where 'name' is the macro parameter.
Chris@16:     
Chris@16:               template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
Chris@16:               struct trait
Chris@16:                 {
Chris@16:                 static const value = unspecified;
Chris@16:                 typedef mpl::bool_<true-or-false> type;
Chris@16:                 };
Chris@16: 
Chris@16:               The metafunction types and return:
Chris@16:     
Chris@16:                 BOOST_TTI_TP_T   = the enclosing type in which to look for our 'name'.
Chris@16:                 
Chris@16:                 BOOST_TTI_TP_R   = the return type of the function
Chris@16:                 
Chris@16:                 BOOST_TTI_TP_FS  = (optional) the parameters of the function as a boost::mpl forward sequence
Chris@16:                           if function parameters are not empty.
Chris@16:                 
Chris@16:                 BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
Chris@16:                           if the need for a tag exists.
Chris@16:                 
Chris@16:                 returns = 'value' is true if the 'name' exists, 
Chris@16:                           with the appropriate function type,
Chris@16:                           otherwise 'value' is false.
Chris@16:                           
Chris@16: */
Chris@16: #define BOOST_TTI_HAS_FUNCTION(name) \
Chris@16:   BOOST_TTI_TRAIT_HAS_FUNCTION \
Chris@16:   ( \
Chris@16:   BOOST_TTI_HAS_FUNCTION_GEN(name), \
Chris@16:   name \
Chris@16:   ) \
Chris@16: /**/
Chris@16: 
Chris@16: #endif // BOOST_TTI_HAS_FUNCTION_HPP