/extlibs/Boost/include/boost/concept/detail/concept_def.hpp

 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