mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2025-08-03 12:49:50 +00:00
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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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 SPROUT_TUPLE_TUPLE_TUPLE_ACCESS_TRAITS_HPP
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#define SPROUT_TUPLE_TUPLE_TUPLE_ACCESS_TRAITS_HPP
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#include <utility>
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#include <type_traits>
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#include <tuple>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/utility/move.hpp>
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#include <sprout/tuple/tuple/tuple_traits.hpp>
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#include <sprout/adl/not_found.hpp>
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namespace sprout_adl {
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template<std::size_t I>
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sprout::not_found_via_adl tuple_get(...);
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} // namespace sprout_adl
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namespace sprout_tuple_detail {
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template<std::size_t I, typename T>
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inline SPROUT_CONSTEXPR decltype(std::get<I>(std::declval<T&>()))
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tuple_get(T& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::get<I>(std::declval<T&>()))
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{
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return std::get<I>(t);
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}
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template<std::size_t I, typename T>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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!std::is_const<T>::value && !std::is_volatile<T>::value && !std::is_reference<T>::value,
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decltype(sprout::move(std::get<I>(std::declval<T&&>())))
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>::type
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tuple_get(T&& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::move(std::get<I>(std::declval<T&&>())))
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{
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return sprout::move(std::get<I>(t));
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}
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template<std::size_t I, typename T>
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inline SPROUT_CONSTEXPR decltype(std::get<I>(std::declval<T const&>()))
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tuple_get(T const& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::get<I>(std::declval<T const&>()))
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{
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return std::get<I>(t);
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}
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} // namespace sprout_tuple_detail
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namespace sprout {
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namespace tuples {
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//
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// tuple_access_traits
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//
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template<typename Tuple>
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struct tuple_access_traits {
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public:
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template<std::size_t I>
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static SPROUT_CONSTEXPR typename sprout::tuples::tuple_traits<Tuple>::template lvalue_reference<I>::type
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tuple_get(Tuple& t) SPROUT_NOEXCEPT {
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using sprout_tuple_detail::tuple_get;
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using sprout_adl::tuple_get;
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return tuple_get<I>(t);
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}
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template<std::size_t I>
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static SPROUT_CONSTEXPR typename sprout::tuples::tuple_traits<Tuple>::template rvalue_reference<I>::type
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tuple_get(Tuple&& t) SPROUT_NOEXCEPT {
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using sprout_tuple_detail::tuple_get;
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using sprout_adl::tuple_get;
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return tuple_get<I>(sprout::move(t));
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}
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template<std::size_t I>
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static SPROUT_CONSTEXPR typename sprout::tuples::tuple_traits<Tuple const>::template lvalue_reference<I>::type
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tuple_get(Tuple const& t) SPROUT_NOEXCEPT {
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using sprout_tuple_detail::tuple_get;
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using sprout_adl::tuple_get;
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return tuple_get<I>(t);
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}
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};
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template<typename Tuple>
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struct tuple_access_traits<Tuple const> {
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public:
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template<std::size_t I>
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static SPROUT_CONSTEXPR typename sprout::tuples::tuple_traits<Tuple const>::template lvalue_reference<I>::type
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tuple_get(Tuple const& t) SPROUT_NOEXCEPT {
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return sprout::tuples::tuple_access_traits<Tuple>::template tuple_get<I>(t);
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}
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};
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} // namespace tuples
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using sprout::tuples::tuple_access_traits;
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} // namespace sprout
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#endif // #ifndef SPROUT_TUPLE_TUPLE_TUPLE_ACCESS_TRAITS_HPP
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