| /*============================================================================= |
| 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 |
| |