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32 lines
1020 B
C++
32 lines
1020 B
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_CHECK_HAS_CONSTRAINTS_DWA2006429_HPP
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# define BOOST_CONCEPT_CHECK_HAS_CONSTRAINTS_DWA2006429_HPP
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namespace boost { namespace concept_checking {
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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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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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template <class Model>
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struct has_constraints
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{
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BOOST_STATIC_CONSTANT(
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bool
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, value = sizeof( concept_checking::has_constraints_((Model*)0) ) == 1 );
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};
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}} // namespace boost::concept_checking
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#endif // BOOST_CONCEPT_CHECK_HAS_CONSTRAINTS_DWA2006429_HPP
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