text: // 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_ASSERT_DWA2006430_HPP
  # define BOOST_CONCEPT_ASSERT_DWA2006430_HPP
  
  # include <boost/config.hpp>
  # include <boost/config/workaround.hpp>
  
  // The old protocol used a constraints() member function in concept
  // checking classes.  If the compiler supports SFINAE, we can detect
  // that function and seamlessly support the old concept checking
  // classes.  In this release, backward compatibility with the old
  // concept checking classes is enabled by default, where available.
  // The old protocol is deprecated, though, and backward compatibility
  // will no longer be the default in the next release.
  
  # if !defined(BOOST_NO_OLD_CONCEPT_SUPPORT)                                         \
      && !defined(BOOST_NO_SFINAE)                                                    \
                                                                                      \
      && !(BOOST_WORKAROUND(__GNUC__, == 3) && BOOST_WORKAROUND(__GNUC_MINOR__, < 4))
  
  // Note: gcc-2.96 through 3.3.x have some SFINAE, but no ability to
  // check for the presence of particularmember functions.
  
  #  define BOOST_OLD_CONCEPT_SUPPORT
  
  # endif
  
  # ifdef BOOST_MSVC
  #  include <boost/concept/detail/msvc.hpp>
  # elif BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
  #  include <boost/concept/detail/borland.hpp>
  # else 
  #  include <boost/concept/detail/general.hpp>
  # endif
  
    // Usage, in class or function context:
    //
    //     BOOST_CONCEPT_ASSERT((UnaryFunctionConcept<F,bool,int>));
    //
  # define BOOST_CONCEPT_ASSERT(ModelInParens) \
      BOOST_CONCEPT_ASSERT_FN(void(*)ModelInParens)
  
  #endif // BOOST_CONCEPT_ASSERT_DWA2006430_HPP
  