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65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2011 Brandon Kohn
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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(BOOST_FUSION_MAP_DETAIL_AT_IMPL_HPP)
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#define BOOST_FUSION_MAP_DETAIL_AT_IMPL_HPP
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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/type_traits/is_const.hpp>
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#include <boost/mpl/at.hpp>
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#include <boost/mpl/int.hpp>
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namespace boost { namespace fusion
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{
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struct map_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<map_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
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mpl::at<typename Sequence::storage_type::types, N>::type
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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& m)
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{
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return m.get_data().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
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mpl::at<typename Sequence::storage_type::types, N>::type
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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& m)
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{
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return m.get_data().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 //BOOST_FUSION_MAP_DETAIL_AT_IMPL_HPP
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