// Copyright David Abrahams 2009. 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_BACKWARD_COMPATIBILITY_DWA200968_HPP# define BOOST_CONCEPT_BACKWARD_COMPATIBILITY_DWA200968_HPPnamespaceboost{namespaceconcepts{}# if defined(BOOST_HAS_CONCEPTS) && !defined(BOOST_CONCEPT_NO_BACKWARD_KEYWORD)namespaceconcept=concepts;# endif }// namespace boost::concept#endif // BOOST_CONCEPT_BACKWARD_COMPATIBILITY_DWA200968_HPP