mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2025-08-03 12:49:50 +00:00
126 lines
5.2 KiB
C++
126 lines
5.2 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 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_GET_HPP
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#define SPROUT_TUPLE_TUPLE_GET_HPP
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#include <utility>
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#include <type_traits>
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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/tuple/tuple/tuple.hpp>
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#include <sprout/tuple/tuple/tuple_size.hpp>
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#include <sprout/tuple/tuple/tuple_element.hpp>
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#include <sprout/tuple/tuple/tuple_traits.hpp>
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#include <sprout/tuple/tuple/tuple_access_traits.hpp>
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#include <sprout/adl/not_found.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 Head, typename... Tail>
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inline SPROUT_CONSTEXPR typename std::add_lvalue_reference<Head>::type
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get_helper(sprout::tuples::detail::tuple_impl<I, Head, Tail...>& t) SPROUT_NOEXCEPT {
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return sprout::tuples::detail::tuple_impl<I, Head, Tail...>::head(t);
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}
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template<std::size_t I, typename Head, typename... Tail>
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inline SPROUT_CONSTEXPR typename std::add_lvalue_reference<typename std::add_const<Head>::type>::type
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get_helper(sprout::tuples::detail::tuple_impl<I, Head, Tail...> const& t) SPROUT_NOEXCEPT {
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return sprout::tuples::detail::tuple_impl<I, Head, Tail...>::head(t);
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}
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} // namespace detail
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//
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// tuple_get
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//
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template<std::size_t I, typename... Types>
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inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type&
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tuple_get(sprout::tuples::tuple<Types...>& t) SPROUT_NOEXCEPT {
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return sprout::tuples::detail::get_helper<I>(t);
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}
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template<std::size_t I, typename... Types>
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inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type&&
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tuple_get(sprout::tuples::tuple<Types...>&& t) SPROUT_NOEXCEPT {
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typedef typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type type;
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return SPROUT_FORWARD(type, sprout::tuples::tuple_get<I>(t));
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}
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template<std::size_t I, typename... Types>
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inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type const&
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tuple_get(sprout::tuples::tuple<Types...> const& t) SPROUT_NOEXCEPT {
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return sprout::tuples::detail::get_helper<I>(t);
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}
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} // namespace tuples
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using sprout::tuples::tuple_get;
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} // namespace sprout
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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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using sprout_adl::tuple_get;
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template<std::size_t I, typename T>
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inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_traits<T>::template lvalue_reference<I>::type
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tuple_get(T& t)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::tuples::tuple_access_traits<T>::template tuple_get<I>(std::declval<T&>())))
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{
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return sprout::tuples::tuple_access_traits<T>::template tuple_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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typename sprout::tuples::tuple_traits<typename std::remove_reference<T>::type>::template rvalue_reference<I>::type
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>::type
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tuple_get(T&& t)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::tuples::tuple_access_traits<typename std::remove_reference<T>::type>::template tuple_get<I>(std::declval<T&&>())))
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{
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return sprout::tuples::tuple_access_traits<T>::template tuple_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 sprout::tuples::tuple_traits<T const>::template lvalue_reference<I>::type
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tuple_get(T const& t)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::tuples::tuple_access_traits<T const>::template tuple_get<I>(std::declval<T const&>())))
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{
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return sprout::tuples::tuple_access_traits<T const>::template tuple_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(tuple_get<I>(std::declval<T>()))
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call_tuple_get(T&& t)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(tuple_get<I>(std::declval<T>())))
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{
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return tuple_get<I>(SPROUT_FORWARD(T, 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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// get
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//
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// effect:
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// ADL callable tuple_get<I>(t) -> tuple_get<I>(t)
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// otherwise -> sprout::tuples::tuple_access_traits<T>::tuple_get<I>(t)
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// [default]
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// 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(sprout_tuple_detail::call_tuple_get<I>(std::declval<T>()))
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get(T&& t)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout_tuple_detail::call_tuple_get<I>(std::declval<T>())))
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{
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return sprout_tuple_detail::call_tuple_get<I>(SPROUT_FORWARD(T, t));
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}
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} // namespace tuples
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using sprout::tuples::get;
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} // namespace sprout
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#endif // #ifndef SPROUT_TUPLE_TUPLE_GET_HPP
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