forked from boostorg/fusion
2114bfca6c
Note 1: Forwarding functions are specified as a C++14 constexpr since std::forward is not a constexpr within C++11. Note 2: Though I'm not sure why it doesn't compile, some declarations are specified as a C++14 constexpr or non-constexpr. Note 3: Boost.Tuple adaptation and TR1-based tuple implementations are not constexpr.
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2013 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(BOOST_FUSION_MAP_DETAIL_AT_IMPL_02042013_0821)
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#define BOOST_FUSION_MAP_DETAIL_AT_IMPL_02042013_0821
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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/utility/declval.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 mpl::int_<N::value> index;
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typedef
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decltype(boost::declval<Sequence>().get(index()))
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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(index());
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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 mpl::int_<N::value> index;
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typedef
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decltype(boost::declval<Sequence const>().get(index()))
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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(index());
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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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