52 lines
3.1 KiB
C++
52 lines
3.1 KiB
C++
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// Copyright David Abrahams 2006. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_CONCEPT_DETAIL_CONCEPT_DEF_DWA200651_HPP
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# define BOOST_CONCEPT_DETAIL_CONCEPT_DEF_DWA200651_HPP
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# include <boost/preprocessor/seq/for_each_i.hpp>
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# include <boost/preprocessor/seq/enum.hpp>
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# include <boost/preprocessor/comma_if.hpp>
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# include <boost/preprocessor/cat.hpp>
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#endif // BOOST_CONCEPT_DETAIL_CONCEPT_DEF_DWA200651_HPP
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// BOOST_concept(SomeName, (p1)(p2)...(pN))
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//
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// Expands to "template <class p1, class p2, ...class pN> struct SomeName"
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//
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// Also defines an equivalent SomeNameConcept for backward compatibility.
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// Maybe in the next release we can kill off the "Concept" suffix for good.
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#if BOOST_WORKAROUND(__GNUC__, <= 3)
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# define BOOST_concept(name, params) \
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template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \
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struct name; /* forward declaration */ \
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\
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template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \
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struct BOOST_PP_CAT(name,Concept) \
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: name< BOOST_PP_SEQ_ENUM(params) > \
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{ \
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/* at least 2.96 and 3.4.3 both need this */ \
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BOOST_PP_CAT(name,Concept)(); \
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}; \
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\
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template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \
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struct name
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#else
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# define BOOST_concept(name, params) \
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template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \
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struct name; /* forward declaration */ \
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\
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template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \
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struct BOOST_PP_CAT(name,Concept) \
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: name< BOOST_PP_SEQ_ENUM(params) > \
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{ \
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}; \
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\
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template < BOOST_PP_SEQ_FOR_EACH_I(BOOST_CONCEPT_typename,~,params) > \
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struct name
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#endif
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// Helper for BOOST_concept, above.
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# define BOOST_CONCEPT_typename(r, ignored, index, t) \
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BOOST_PP_COMMA_IF(index) typename t
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