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61 lines
1.9 KiB
61 lines
1.9 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2014,2018 Kohei Takahashi
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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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#ifndef FUSION_VALUE_AT_IMPL_16122014_1641
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#define FUSION_VALUE_AT_IMPL_16122014_1641
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/container/vector/detail/config.hpp>
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///////////////////////////////////////////////////////////////////////////////
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// Without variadics, we will use the PP version
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///////////////////////////////////////////////////////////////////////////////
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#if !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
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# include <boost/fusion/container/vector/detail/cpp03/value_at_impl.hpp>
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#else
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///////////////////////////////////////////////////////////////////////////////
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// C++11 interface
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/fusion/container/vector/vector_fwd.hpp>
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#include <boost/type_traits/declval.hpp>
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#include <boost/mpl/identity.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 vector_detail
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{
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template <std::size_t I, typename T>
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struct store;
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template <std::size_t N, typename U>
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static inline BOOST_FUSION_GPU_ENABLED
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mpl::identity<U> value_at_impl(store<N, U> const volatile*);
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}
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namespace extension
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{
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template <typename Tag>
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struct value_at_impl;
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template <>
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struct value_at_impl<vector_tag>
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{
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template <typename Sequence, typename N>
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struct apply : BOOST_FUSION_DECLTYPE_N3031((
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vector_detail::value_at_impl<N::value>(boost::declval<Sequence*>())
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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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#endif
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