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 # define BOOST_concept(name, params) \ 19 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 20 struct name; /* forward declaration */ \ 21 \ 22 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 23 struct BOOST_PP_CAT(name,Concept) \ 24 : name< BOOST_PP_SEQ_ENUM(params) > \ 25 { \ 26 }; \ 27 \ 28 template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \ 29 struct name 30 31 // Helper for BOOST_concept, above. 32 # define BOOST_CONCEPT_typename(r, ignored, index, t) \ 33 BOOST_PP_COMMA_IF(index) typename t 34 35