empty.hpp 910 B

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  1. #ifndef BOOST_MPL_EMPTY_HPP_INCLUDED
  2. #define BOOST_MPL_EMPTY_HPP_INCLUDED
  3. // Copyright Aleksey Gurtovoy 2000-2004
  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/empty_fwd.hpp>
  14. #include <boost/mpl/sequence_tag.hpp>
  15. #include <boost/mpl/aux_/empty_impl.hpp>
  16. #include <boost/mpl/aux_/na_spec.hpp>
  17. #include <boost/mpl/aux_/lambda_support.hpp>
  18. namespace boost { namespace mpl {
  19. template<
  20. typename BOOST_MPL_AUX_NA_PARAM(Sequence)
  21. >
  22. struct empty
  23. : empty_impl< typename sequence_tag<Sequence>::type >
  24. ::template apply< Sequence >
  25. {
  26. BOOST_MPL_AUX_LAMBDA_SUPPORT(1,empty,(Sequence))
  27. };
  28. BOOST_MPL_AUX_NA_SPEC(1, empty)
  29. }}
  30. #endif // BOOST_MPL_EMPTY_HPP_INCLUDED