// 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_USAGE_DWA2006919_HPP

# define BOOST_CONCEPT_USAGE_DWA2006919_HPP

# include <boost/concept/assert.hpp>

# include <boost/detail/workaround.hpp>

namespace boost { namespace concept { 

# if BOOST_WORKAROUND(__GNUC__, == 2)

#  define BOOST_CONCEPT_USAGE(model) ~model()

# else 

template <class Model>

struct usage_requirements

{

    ~usage_requirements() { ((Model*)0)->~Model(); }

};

#  if BOOST_WORKAROUND(__GNUC__, <= 3)

#   define BOOST_CONCEPT_USAGE(model)                                    \

      model(); /* at least 2.96 and 3.4.3 both need this :( */           \

      BOOST_CONCEPT_ASSERT((boost::concept::usage_requirements<model>)); \

      ~model()

#  else

#   define BOOST_CONCEPT_USAGE(model)                                    \

      BOOST_CONCEPT_ASSERT((boost::concept::usage_requirements<model>)); \

      ~model()

#  endif

# endif 

}} // namespace boost::concept

#endif // BOOST_CONCEPT_USAGE_DWA2006919_HPP