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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_GENERAL_DWA2006429_HPP | |
5 | # define BOOST_CONCEPT_DETAIL_GENERAL_DWA2006429_HPP | |
6 | ||
7 | # include <boost/config.hpp> | |
8 | # include <boost/preprocessor/cat.hpp> | |
9 | # include <boost/concept/detail/backward_compatibility.hpp> | |
10 | ||
11 | # ifdef BOOST_OLD_CONCEPT_SUPPORT | |
12 | # include <boost/concept/detail/has_constraints.hpp> | |
13 | # include <boost/mpl/if.hpp> | |
14 | # endif | |
15 | ||
16 | // This implementation works on Comeau and GCC, all the way back to | |
17 | // 2.95 | |
18 | namespace boost { namespace concepts { | |
19 | ||
20 | template <class ModelFn> | |
21 | struct requirement_; | |
22 | ||
23 | namespace detail | |
24 | { | |
25 | template <void(*)()> struct instantiate {}; | |
26 | } | |
27 | ||
28 | template <class Model> | |
29 | struct requirement | |
30 | { | |
31 | static void failed() { ((Model*)0)->~Model(); } | |
32 | }; | |
33 | ||
34 | struct failed {}; | |
35 | ||
36 | template <class Model> | |
37 | struct requirement<failed ************ Model::************> | |
38 | { | |
39 | static void failed() { ((Model*)0)->~Model(); } | |
40 | }; | |
41 | ||
42 | # ifdef BOOST_OLD_CONCEPT_SUPPORT | |
43 | ||
44 | template <class Model> | |
45 | struct constraint | |
46 | { | |
47 | static void failed() { ((Model*)0)->constraints(); } | |
48 | }; | |
49 | ||
50 | template <class Model> | |
51 | struct requirement_<void(*)(Model)> | |
52 | : mpl::if_< | |
53 | concepts::not_satisfied<Model> | |
54 | , constraint<Model> | |
55 | , requirement<failed ************ Model::************> | |
56 | >::type | |
57 | {}; | |
58 | ||
59 | # else | |
60 | ||
61 | // For GCC-2.x, these can't have exactly the same name | |
62 | template <class Model> | |
63 | struct requirement_<void(*)(Model)> | |
64 | : requirement<failed ************ Model::************> | |
65 | {}; | |
66 | ||
67 | # endif | |
68 | ||
69 | # define BOOST_CONCEPT_ASSERT_FN( ModelFnPtr ) \ | |
70 | typedef ::boost::concepts::detail::instantiate< \ | |
71 | &::boost::concepts::requirement_<ModelFnPtr>::failed> \ | |
72 | BOOST_PP_CAT(boost_concept_check,__LINE__) \ | |
73 | BOOST_ATTRIBUTE_UNUSED | |
74 | ||
75 | }} | |
76 | ||
77 | #endif // BOOST_CONCEPT_DETAIL_GENERAL_DWA2006429_HPP |