/Src/Dependencies/Boost/boost/fusion/sequence/intrinsic/at.hpp
http://hadesmem.googlecode.com/ · C++ Header · 106 lines · 82 code · 17 blank · 7 comment · 0 complexity · ad1c70b2cba478702d760a8f116c9c8c 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_AT_05042005_0722)
- #define FUSION_AT_05042005_0722
- #include <boost/mpl/int.hpp>
- #include <boost/type_traits/is_const.hpp>
- #include <boost/fusion/support/tag_of.hpp>
- #include <boost/fusion/support/detail/access.hpp>
- namespace boost { namespace fusion
- {
- // Special tags:
- struct sequence_facade_tag;
- struct boost_tuple_tag; // boost::tuples::tuple tag
- struct boost_array_tag; // boost::array tag
- struct mpl_sequence_tag; // mpl sequence tag
- struct std_pair_tag; // std::pair tag
- namespace extension
- {
- template <typename Tag>
- struct at_impl
- {
- template <typename Sequence, typename N>
- struct apply;
- };
- template <>
- struct at_impl<sequence_facade_tag>
- {
- template <typename Sequence, typename N>
- struct apply : Sequence::template at<Sequence, N> {};
- };
- template <>
- struct at_impl<boost_tuple_tag>;
- template <>
- struct at_impl<boost_array_tag>;
- template <>
- struct at_impl<mpl_sequence_tag>;
- template <>
- struct at_impl<std_pair_tag>;
- }
- namespace result_of
- {
- template <typename Sequence, typename N>
- struct at
- : extension::at_impl<typename detail::tag_of<Sequence>::type>::
- template apply<Sequence, N>
- {};
- template <typename Sequence, int N>
- struct at_c
- : at<Sequence, mpl::int_<N> >
- {};
- }
- template <typename N, typename Sequence>
- inline typename
- lazy_disable_if<
- is_const<Sequence>
- , result_of::at<Sequence, N>
- >::type
- at(Sequence& seq)
- {
- return result_of::at<Sequence, N>::call(seq);
- }
- template <typename N, typename Sequence>
- inline typename result_of::at<Sequence const, N>::type
- at(Sequence const& seq)
- {
- return result_of::at<Sequence const, N>::call(seq);
- }
- template <int N, typename Sequence>
- inline typename
- lazy_disable_if<
- is_const<Sequence>
- , result_of::at_c<Sequence, N>
- >::type
- at_c(Sequence& seq)
- {
- return fusion::at<mpl::int_<N> >(seq);
- }
- template <int N, typename Sequence>
- inline typename result_of::at_c<Sequence const, N>::type
- at_c(Sequence const& seq)
- {
- return fusion::at<mpl::int_<N> >(seq);
- }
- }}
- #endif