/Src/Dependencies/Boost/boost/fusion/sequence/intrinsic/empty.hpp
http://hadesmem.googlecode.com/ · C++ Header · 60 lines · 45 code · 8 blank · 7 comment · 1 complexity · 242f2ae2995f14b094f41c882950e9e3 MD5 · raw file
- /*=============================================================================
- Copyright (c) 2001-2006 Joel de Guzman
- 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)
- ==============================================================================*/
- #if !defined(FUSION_EMPTY_09162005_0335)
- #define FUSION_EMPTY_09162005_0335
- #include <boost/fusion/sequence/intrinsic/size.hpp>
- #include <boost/mpl/bool.hpp>
- #include <boost/fusion/support/tag_of.hpp>
- namespace boost { namespace fusion
- {
- // Special tags:
- struct sequence_facade_tag;
- struct mpl_sequence_tag; // mpl sequence tag
- namespace extension
- {
- template <typename Tag>
- struct empty_impl
- {
- template <typename Sequence>
- struct apply
- : mpl::bool_<(result_of::size<Sequence>::value == 0)>
- {};
- };
- template <>
- struct empty_impl<sequence_facade_tag>
- {
- template <typename Sequence>
- struct apply : Sequence::template empty<Sequence> {};
- };
- template <>
- struct empty_impl<mpl_sequence_tag>;
- }
- namespace result_of
- {
- template <typename Sequence>
- struct empty
- : extension::empty_impl<typename detail::tag_of<Sequence>::type>::
- template apply<Sequence>
- {};
- }
- template <typename Sequence>
- inline typename result_of::empty<Sequence>::type
- empty(Sequence const&)
- {
- typedef typename result_of::empty<Sequence>::type result;
- return result();
- }
- }}
- #endif