mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2025-07-02 14:04:09 +00:00
191 lines
6.4 KiB
C++
191 lines
6.4 KiB
C++
#ifndef SPROUT_TUPLE_TUPLE_GET_HPP
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#define SPROUT_TUPLE_TUPLE_GET_HPP
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#include <cstddef>
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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/type_traits/enabler_if.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/tuple/tuple/tuple.hpp>
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namespace sprout {
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namespace tuples {
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//
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// tuple_size
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//
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template<typename T>
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struct tuple_size
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: public std::tuple_size<T>
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{};
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template<typename T>
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struct tuple_size<T const>
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: public sprout::tuples::tuple_size<T>
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{};
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template<typename T>
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struct tuple_size<T volatile>
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: public sprout::tuples::tuple_size<T>
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{};
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template<typename T>
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struct tuple_size<T const volatile>
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: public sprout::tuples::tuple_size<T>
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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 T>
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struct tuple_element
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: public std::tuple_element<I, T>
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{};
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template<std::size_t I, typename T>
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struct tuple_element<I, T const>
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: public sprout::tuples::tuple_element<I, T>
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{};
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template<std::size_t I, typename T>
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struct tuple_element<I, T volatile>
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: public sprout::tuples::tuple_element<I, T>
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{};
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template<std::size_t I, typename T>
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struct tuple_element<I, T const volatile>
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: public sprout::tuples::tuple_element<I, T>
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{};
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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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// 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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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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get(sprout::tuples::tuple<Types...>&& t) SPROUT_NOEXCEPT {
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return sprout::forward<typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type&&>(
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sprout::tuples::get<I>(t)
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);
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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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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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namespace tuple_detail {
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struct not_found_adl_get {};
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template<std::size_t I>
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sprout::tuple_detail::not_found_adl_get get(...);
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template<std::size_t I, typename T>
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struct has_std_get_test {
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public:
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template<
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typename U = T,
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typename = decltype(std::get<I>(std::declval<U>()))
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>
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static std::true_type test(int);
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static std::false_type test(...);
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};
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template<std::size_t I, typename T>
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struct has_std_get
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: public decltype(sprout::tuple_detail::has_std_get_test<I, T>::test(0))
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{};
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template<std::size_t I, typename T>
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struct has_adl_get_test {
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public:
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template<
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typename U = T,
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typename sprout::enabler_if<
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!std::is_same<decltype(get<I>(std::declval<U>())), sprout::tuple_detail::not_found_adl_get>::value
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&& !sprout::tuple_detail::has_std_get<I, T>::value
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>::type = sprout::enabler
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>
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static std::true_type test(int);
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static std::false_type test(...);
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};
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template<std::size_t I, typename T>
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struct has_adl_get
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: public decltype(sprout::tuple_detail::has_adl_get_test<I, T>::test(0))
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{};
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template<std::size_t I, typename T, typename = void>
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struct noexcept_get;
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template<std::size_t I, typename T>
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struct noexcept_get<I, T, typename std::enable_if<sprout::tuple_detail::has_adl_get<I, T>::value>::type>
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: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(get<I>(std::declval<T>()), false)>
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{};
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template<std::size_t I, typename T>
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struct noexcept_get<I, T, typename std::enable_if<sprout::tuple_detail::has_std_get<I, T>::value>::type>
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: public std::integral_constant<bool, SPROUT_NOEXCEPT_EXPR_OR_DEFAULT(std::get<I>(std::declval<T>()), false)>
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{};
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template<std::size_t I, typename T, typename = void>
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struct get_result;
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template<std::size_t I, typename T>
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struct get_result<I, T, typename std::enable_if<sprout::tuple_detail::has_adl_get<I, T>::value>::type> {
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public:
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typedef decltype(get<I>(std::declval<T>())) type;
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};
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template<std::size_t I, typename T>
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struct get_result<I, T, typename std::enable_if<sprout::tuple_detail::has_std_get<I, T>::value>::type> {
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public:
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typedef decltype(std::get<I>(std::declval<T>())) type;
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};
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template<
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std::size_t I, typename T,
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typename sprout::enabler_if<sprout::tuple_detail::has_adl_get<I, T>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout::tuple_detail::get_result<I, T>::type
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get_impl(T&& t)
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SPROUT_NOEXCEPT_EXPR((sprout::tuple_detail::noexcept_get<I, T>::value))
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{
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return get<I>(sprout::forward<T>(t));
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}
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template<
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std::size_t I, typename T,
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typename sprout::enabler_if<sprout::tuple_detail::has_std_get<I, T>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout::tuple_detail::get_result<I, T>::type
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get_impl(T&& t)
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SPROUT_NOEXCEPT_EXPR((sprout::tuple_detail::noexcept_get<I, T>::value))
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{
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return std::get<I>(sprout::forward<T>(t));
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}
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} // namespace tuple_detail
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namespace tuples {
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//
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// get
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//
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template<std::size_t I, typename T>
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inline SPROUT_CONSTEXPR typename sprout::tuple_detail::get_result<I, T>::type
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get(T&& t)
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SPROUT_NOEXCEPT_EXPR((sprout::tuple_detail::noexcept_get<I, T>::value))
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{
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return sprout::tuple_detail::get_impl<I>(sprout::forward<T>(t));
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}
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} // namespace tuples
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using sprout::tuples::tuple_size;
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using sprout::tuples::tuple_element;
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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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