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