1 // Copyright David Abrahams 2006. Distributed under the Boost

     2 // Software License, Version 1.0. (See accompanying

     3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

     4 #ifndef BOOST_CONCEPT_USAGE_DWA2006919_HPP

     5 # define BOOST_CONCEPT_USAGE_DWA2006919_HPP

     6 

     7 # include <boost/concept/assert.hpp>

     8 # include <boost/detail/workaround.hpp>

     9 

    10 namespace boost { namespace concept { 

    11 

    12 # if BOOST_WORKAROUND(__GNUC__, == 2)

    13 

    14 #  define BOOST_CONCEPT_USAGE(model) ~model()

    15 

    16 # else 

    17 

    18 template <class Model>

    19 struct usage_requirements

    20 {

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

    22 };

    23 

    24 #  if BOOST_WORKAROUND(__GNUC__, <= 3)

    25 

    26 #   define BOOST_CONCEPT_USAGE(model)                                    \

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

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

    29       ~model()

    30 

    31 #  else

    32 

    33 #   define BOOST_CONCEPT_USAGE(model)                                    \

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

    35       ~model()

    36 

    37 #  endif

    38 

    39 # endif 

    40 

    41 }} // namespace boost::concept

    42 

    43 #endif // BOOST_CONCEPT_USAGE_DWA2006919_HPP