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51 lines
1.6 KiB
51 lines
1.6 KiB
3 years ago
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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_HAS_CONSTRAINTS_DWA2006429_HPP
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# define BOOST_CONCEPT_DETAIL_HAS_CONSTRAINTS_DWA2006429_HPP
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# include <boost/type_traits/integral_constant.hpp>
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# include <boost/config/workaround.hpp>
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# include <boost/concept/detail/backward_compatibility.hpp>
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namespace boost { namespace concepts {
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namespace detail
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{
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// Here we implement the metafunction that detects whether a
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// constraints metafunction exists
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typedef char yes;
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typedef char (&no)[2];
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template <class Model, void (Model::*)()>
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struct wrap_constraints {};
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#if BOOST_WORKAROUND(__SUNPRO_CC, <= 0x580) || defined(__CUDACC__)
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// Work around the following bogus error in Sun Studio 11, by
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// turning off the has_constraints function entirely:
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// Error: complex expression not allowed in dependent template
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// argument expression
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inline no has_constraints_(...);
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#else
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template <class Model>
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inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
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inline no has_constraints_(...);
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#endif
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}
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// This would be called "detail::has_constraints," but it has a strong
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// tendency to show up in error messages.
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template <class Model>
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struct not_satisfied
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{
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BOOST_STATIC_CONSTANT(
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bool
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, value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
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typedef boost::integral_constant<bool, value> type;
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};
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}} // namespace boost::concepts::detail
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#endif // BOOST_CONCEPT_DETAIL_HAS_CONSTRAINTS_DWA2006429_HPP
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