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78 lines
1.9 KiB
78 lines
1.9 KiB
// 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_GENERAL_DWA2006429_HPP
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# define BOOST_CONCEPT_DETAIL_GENERAL_DWA2006429_HPP
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# include <boost/config.hpp>
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# include <boost/preprocessor/cat.hpp>
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# include <boost/concept/detail/backward_compatibility.hpp>
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# ifdef BOOST_OLD_CONCEPT_SUPPORT
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# include <boost/concept/detail/has_constraints.hpp>
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# include <boost/type_traits/conditional.hpp>
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# endif
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// This implementation works on Comeau and GCC, all the way back to
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// 2.95
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namespace boost { namespace concepts {
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template <class ModelFn>
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struct requirement_;
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namespace detail
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{
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template <void(*)()> struct instantiate {};
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}
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template <class Model>
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struct requirement
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{
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static void failed() { ((Model*)0)->~Model(); }
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};
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struct failed {};
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template <class Model>
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struct requirement<failed ************ Model::************>
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{
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static void failed() { ((Model*)0)->~Model(); }
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};
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# ifdef BOOST_OLD_CONCEPT_SUPPORT
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template <class Model>
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struct constraint
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{
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static void failed() { ((Model*)0)->constraints(); }
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};
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template <class Model>
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struct requirement_<void(*)(Model)>
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: boost::conditional<
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concepts::not_satisfied<Model>::value
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, constraint<Model>
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, requirement<failed ************ Model::************>
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>::type
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{};
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# else
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// For GCC-2.x, these can't have exactly the same name
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template <class Model>
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struct requirement_<void(*)(Model)>
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: requirement<failed ************ Model::************>
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{};
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# endif
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# define BOOST_CONCEPT_ASSERT_FN( ModelFnPtr ) \
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typedef ::boost::concepts::detail::instantiate< \
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&::boost::concepts::requirement_<ModelFnPtr>::failed> \
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BOOST_PP_CAT(boost_concept_check,__LINE__) \
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BOOST_ATTRIBUTE_UNUSED
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}}
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#endif // BOOST_CONCEPT_DETAIL_GENERAL_DWA2006429_HPP
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