always.hpp 838 B

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  1. #ifndef BOOST_MPL_ALWAYS_HPP_INCLUDED
  2. #define BOOST_MPL_ALWAYS_HPP_INCLUDED
  3. // Copyright Aleksey Gurtovoy 2001-2004
  4. //
  5. // Distributed under the Boost Software License, Version 1.0.
  6. // (See accompanying file LICENSE_1_0.txt or copy at
  7. // http://www.boost.org/LICENSE_1_0.txt)
  8. //
  9. // See http://www.boost.org/libs/mpl for documentation.
  10. // $Id$
  11. // $Date$
  12. // $Revision$
  13. #include <boost/mpl/aux_/preprocessor/default_params.hpp>
  14. #include <boost/mpl/aux_/na.hpp>
  15. #include <boost/mpl/aux_/arity_spec.hpp>
  16. namespace boost { namespace mpl {
  17. template< typename Value > struct always
  18. {
  19. template<
  20. BOOST_MPL_PP_DEFAULT_PARAMS(BOOST_MPL_LIMIT_METAFUNCTION_ARITY, typename T, na)
  21. >
  22. struct apply
  23. {
  24. typedef Value type;
  25. };
  26. };
  27. BOOST_MPL_AUX_ARITY_SPEC(0, always)
  28. }}
  29. #endif // BOOST_MPL_ALWAYS_HPP_INCLUDED