boost/concept/usage.hpp

   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