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- /*=============================================================================
- Copyright (c) 2001-2011 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_IMPL_05042005_0741)
- #define FUSION_AT_IMPL_05042005_0741
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/support/detail/access.hpp>
- #include <boost/fusion/container/vector/detail/value_at_impl.hpp>
- #include <boost/static_assert.hpp>
- namespace boost { namespace fusion
- {
- struct vector_tag;
- namespace extension
- {
- template <typename Tag>
- struct at_impl;
- template <>
- struct at_impl<vector_tag>
- {
- template <typename Sequence, typename N>
- struct apply
- {
- typedef typename value_at_impl<vector_tag>::template apply<Sequence, N>::type element;
- typedef typename detail::ref_result<element>::type type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence& v)
- {
- BOOST_STATIC_ASSERT((N::value < Sequence::size::value));
- return v.at_impl(N());
- }
- };
- template <typename Sequence, typename N>
- struct apply <Sequence const, N>
- {
- typedef typename value_at_impl<vector_tag>::template apply<Sequence, N>::type element;
- typedef typename detail::cref_result<element>::type type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence const& v)
- {
- BOOST_STATIC_ASSERT((N::value < Sequence::size::value));
- return v.at_impl(N());
- }
- };
- };
- }
- }}
- #endif
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