Chris@16: // Copyright David Abrahams 2006. Distributed under the Boost
Chris@16: // Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef BOOST_CONCEPT_USAGE_DWA2006919_HPP
Chris@16: # define BOOST_CONCEPT_USAGE_DWA2006919_HPP
Chris@16: 
Chris@16: # include <boost/concept/assert.hpp>
Chris@16: # include <boost/detail/workaround.hpp>
Chris@16: # include <boost/concept/detail/backward_compatibility.hpp>
Chris@16: 
Chris@16: namespace boost { namespace concepts { 
Chris@16: 
Chris@16: template <class Model>
Chris@16: struct usage_requirements
Chris@16: {
Chris@16:     ~usage_requirements() { ((Model*)0)->~Model(); }
Chris@16: };
Chris@16: 
Chris@16: #  if BOOST_WORKAROUND(__GNUC__, <= 3)
Chris@16: 
Chris@16: #   define BOOST_CONCEPT_USAGE(model)                                    \
Chris@16:       model(); /* at least 2.96 and 3.4.3 both need this :( */           \
Chris@16:       BOOST_CONCEPT_ASSERT((boost::concepts::usage_requirements<model>)); \
Chris@16:       ~model()
Chris@16: 
Chris@16: #  else
Chris@16: 
Chris@16: #   define BOOST_CONCEPT_USAGE(model)                                    \
Chris@16:       BOOST_CONCEPT_ASSERT((boost::concepts::usage_requirements<model>)); \
Chris@16:       ~model()
Chris@16: 
Chris@16: #  endif
Chris@16: 
Chris@16: }} // namespace boost::concepts
Chris@16: 
Chris@16: #endif // BOOST_CONCEPT_USAGE_DWA2006919_HPP