forward.hpp 1.1 KB

12345678910111213141516171819202122232425262728293031
  1. // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
  2. // (C) Copyright 2003-2007 Jonathan Turkanis
  3. // Distributed under the Boost Software License, Version 1.0. (See accompanying
  4. // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
  5. // See http://www.boost.org/libs/iostreams for documentation.
  6. #ifndef BOOST_IOSTREAMS_DETAIL_BROKEN_OVERLOAD_RESOLUTION_HPP_INCLUDED
  7. #define BOOST_IOSTREAMS_DETAIL_BROKEN_OVERLOAD_RESOLUTION_HPP_INCLUDED
  8. #include <boost/config.hpp> // BOOST_STATIC_CONSANT.
  9. #include <boost/mpl/bool.hpp>
  10. #include <boost/type_traits/is_same.hpp>
  11. namespace boost { namespace iostreams { namespace detail {
  12. template<typename Device, typename U>
  13. struct forward_impl {
  14. BOOST_STATIC_CONSTANT(bool, value =
  15. ( !is_same< U, Device >::value &&
  16. !is_same< U, reference_wrapper<Device> >::value ));
  17. };
  18. template<typename Device, typename U>
  19. struct forward
  20. : mpl::bool_<forward_impl<Device, U>::value>
  21. { };
  22. } } } // End namespaces detail, iostreams, boost.
  23. #endif // #ifndef BOOST_IOSTREAMS_DETAIL_BROKEN_OVERLOAD_RESOLUTION_HPP_INCLUDED