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Editing: has_constraints.hpp
// Copyright David Abrahams 2006. Distributed under the Boost // Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_CONCEPT_CHECK_HAS_CONSTRAINTS_DWA2006429_HPP # define BOOST_CONCEPT_CHECK_HAS_CONSTRAINTS_DWA2006429_HPP namespace boost { namespace concept_checking { // Here we implement the "metafunction" that detects whether a // constraints metafunction exists typedef char yes; typedef char (&no)[2]; template <class Model, void (Model::*)()> struct wrap_constraints {}; template <class Model> inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0); inline no has_constraints_(...); template <class Model> struct has_constraints { BOOST_STATIC_CONSTANT( bool , value = sizeof( concept_checking::has_constraints_((Model*)0) ) == 1 ); }; }} // namespace boost::concept_checking #endif // BOOST_CONCEPT_CHECK_HAS_CONSTRAINTS_DWA2006429_HPP
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