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61 lines
2.0 KiB
61 lines
2.0 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_AT_IMPL_05042005_0741)
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#define FUSION_AT_IMPL_05042005_0741
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/detail/access.hpp>
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#include <boost/fusion/container/vector/detail/value_at_impl.hpp>
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#include <boost/static_assert.hpp>
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namespace boost { namespace fusion
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{
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struct vector_tag;
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namespace extension
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{
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template <typename Tag>
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struct at_impl;
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template <>
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struct at_impl<vector_tag>
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{
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template <typename Sequence, typename N>
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struct apply
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{
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typedef typename value_at_impl<vector_tag>::template apply<Sequence, N>::type element;
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typedef typename detail::ref_result<element>::type type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Sequence& v)
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{
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BOOST_STATIC_ASSERT((N::value < Sequence::size::value));
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return v.at_impl(N());
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}
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};
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template <typename Sequence, typename N>
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struct apply <Sequence const, N>
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{
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typedef typename value_at_impl<vector_tag>::template apply<Sequence, N>::type element;
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typedef typename detail::cref_result<element>::type type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Sequence const& v)
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{
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BOOST_STATIC_ASSERT((N::value < Sequence::size::value));
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return v.at_impl(N());
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}
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};
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};
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}
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}}
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#endif
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