mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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111 lines
3.7 KiB
C++
111 lines
3.7 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_UTILITY_PAIR_TUPLE_HPP
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#define SPROUT_UTILITY_PAIR_TUPLE_HPP
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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/pair/pair.hpp>
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#include <sprout/utility/move.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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#include <sprout/type_traits/identity.hpp>
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#include <sprout/detail/nil_base.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 tuple_element_impl;
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template<std::size_t I, typename T1, typename T2>
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struct tuple_element_impl<I, sprout::pair<T1, T2> >
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: public sprout::detail::nil_base
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{};
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template<typename T1, typename T2>
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struct tuple_element_impl<0, sprout::pair<T1, T2> >
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: public sprout::identity<T1>
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{};
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template<typename T1, typename T2>
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struct tuple_element_impl<1, sprout::pair<T1, T2> >
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: public sprout::identity<T2>
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{};
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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, sprout::pair<T1, T2> > {
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public:
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SPROUT_CONSTEXPR T1& operator()(sprout::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()(sprout::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, sprout::pair<T1, T2> > {
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public:
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SPROUT_CONSTEXPR T2& operator()(sprout::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()(sprout::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 std {
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#if defined(__clang__)
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Wmismatched-tags"
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#endif
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//
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// tuple_size
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//
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template<typename T1, typename T2>
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struct tuple_size<sprout::pair<T1, T2> >
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: public sprout::integral_constant<std::size_t, 2>
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{};
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//
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// tuple_element
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//
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template<std::size_t I, typename T1, typename T2>
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struct tuple_element<I, sprout::pair<T1, T2> >
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: public sprout::tuples::detail::tuple_element_impl<I, sprout::pair<T1, T2> >
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{};
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#if defined(__clang__)
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# pragma clang diagnostic pop
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#endif
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} // namespace std
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namespace sprout {
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//
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// tuple_get
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//
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template<std::size_t I, typename T1, typename T2>
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inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::pair<T1, T2> >::type&
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tuple_get(sprout::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, sprout::pair<T1, T2> >()(t);
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}
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template<std::size_t I, typename T1, typename T2>
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inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::pair<T1, T2> >::type const&
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tuple_get(sprout::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, sprout::pair<T1, T2> >()(t);
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}
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template<std::size_t I, typename T1, typename T2>
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inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::pair<T1, T2> >::type&&
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tuple_get(sprout::pair<T1, T2>&& t) SPROUT_NOEXCEPT {
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return sprout::move(sprout::tuples::get<I>(t));
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_UTILITY_PAIR_TUPLE_HPP
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