1 // Copyright David Abrahams 2006. Distributed under the Boost 2 // Software License, Version 1.0. (See accompanying 3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 4 #ifndef BOOST_CONCEPT_DETAIL_CONCEPT_DEF_DWA200651_HPP 5 # define BOOST_CONCEPT_DETAIL_CONCEPT_DEF_DWA200651_HPP 6 # include <boost/preprocessor/seq/for_each_i.hpp> 7 # include <boost/preprocessor/seq/enum.hpp> 8 # include <boost/preprocessor/comma_if.hpp> 9 # include <boost/preprocessor/cat.hpp> 10 #endif // BOOST_CONCEPT_DETAIL_CONCEPT_DEF_DWA200651_HPP 11 12 // BOOST_concept(SomeName, (p1)(p2)...(pN)) 13 // 14 // Expands to "template <class p1, class p2, ...class pN> struct SomeName" 15 // 16 // Also defines an equivalent SomeNameConcept for backward compatibility. 17 // Maybe in the next release we can kill off the "Concept" suffix for good. 18 #if BOOST_WORKAROUND(__GNUC__, <= 3) 19 # define BOOST_concept(name, params) \ 20 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 21 struct name; /* forward declaration */ \ 22 \ 23 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 24 struct BOOST_PP_CAT(name,Concept) \ 25 : name< BOOST_PP_SEQ_ENUM(params) > \ 26 { \ 27 /* at least 2.96 and 3.4.3 both need this */ \ 28 BOOST_PP_CAT(name,Concept)(); \ 29 }; \ 30 \ 31 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 32 struct name 33 #else 34 # define BOOST_concept(name, params) \ 35 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 36 struct name; /* forward declaration */ \ 37 \ 38 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 39 struct BOOST_PP_CAT(name,Concept) \ 40 : name< BOOST_PP_SEQ_ENUM(params) > \ 41 { \ 42 }; \ 43 \ 44 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 45 struct name 46 #endif 47 48 // Helper for BOOST_concept, above. 49 # define BOOST_CONCEPT_typename(r, ignored, index, t) \ 50 BOOST_PP_COMMA_IF(index) typename t 51 52