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- /*=============================================================================
- Copyright (c) 2009 Christopher Schmidt
- 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)
- ==============================================================================*/
- #ifndef BOOST_FUSION_VIEW_REVERSE_VIEW_DETAIL_AT_IMPL_HPP
- #define BOOST_FUSION_VIEW_REVERSE_VIEW_DETAIL_AT_IMPL_HPP
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/sequence/intrinsic/at.hpp>
- #include <boost/mpl/minus.hpp>
- #include <boost/mpl/int.hpp>
- namespace boost { namespace fusion { namespace extension
- {
- template <typename>
- struct at_impl;
- template <>
- struct at_impl<reverse_view_tag>
- {
- template <typename Seq, typename N>
- struct apply
- {
- typedef mpl::minus<typename Seq::size, mpl::int_<1>, N> real_n;
- typedef typename
- result_of::at<typename Seq::seq_type, real_n>::type
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Seq& seq)
- {
- return fusion::at<real_n>(seq.seq);
- }
- };
- };
- }}}
- #endif
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