mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-12-03 21:15:42 +00:00
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 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_STD_UTILITY_HPP
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#define SPROUT_TUPLE_STD_UTILITY_HPP
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#include <type_traits>
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#include <array>
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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/move.hpp>
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#include <sprout/tuple/tuple.hpp>
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namespace sprout {
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namespace tuples {
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namespace detail {
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template<std::size_t I, typename T>
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struct get_impl;
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template<typename T1, typename T2>
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struct get_impl<0, std::pair<T1, T2> > {
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public:
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SPROUT_CONSTEXPR T1& operator()(std::pair<T1, T2>& t) const {
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return t.first;
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}
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SPROUT_CONSTEXPR T1 const& operator()(std::pair<T1, T2> const& t) const {
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return t.first;
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}
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};
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template<typename T1, typename T2>
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struct get_impl<1, std::pair<T1, T2> > {
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public:
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SPROUT_CONSTEXPR T2& operator()(std::pair<T1, T2>& t) const {
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return t.second;
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}
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SPROUT_CONSTEXPR T2 const& operator()(std::pair<T1, T2> const& t) const {
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return t.second;
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}
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};
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} // namespace detail
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} // namespace tuples
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} // namespace sprout
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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 T1, typename T2>
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struct tuple_access_traits<std::pair<T1, T2> > {
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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_element<I, std::pair<T1, T2> >::type&
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tuple_get(std::pair<T1, T2>& t) SPROUT_NOEXCEPT {
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static_assert(I < 2, "tuple_get: index out of range");
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return sprout::tuples::detail::get_impl<I, std::pair<T1, T2> >()(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_element<I, std::pair<T1, T2> >::type const&
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tuple_get(std::pair<T1, T2> const& t) SPROUT_NOEXCEPT {
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static_assert(I < 2, "tuple_get: index out of range");
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return sprout::tuples::detail::get_impl<I, std::pair<T1, T2> >()(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_element<I, std::pair<T1, T2> >::type&&
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tuple_get(std::pair<T1, T2>&& t) SPROUT_NOEXCEPT {
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return sprout::move(tuple_get<I>(t));
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}
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};
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} // namespace tuples
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} // namespace sprout
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#endif // #ifndef SPROUT_TUPLE_STD_UTILITY_HPP
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