mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
405 lines
14 KiB
C++
405 lines
14 KiB
C++
#ifndef SPROUT_TUPLE_TUPLE_HPP
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#define SPROUT_TUPLE_TUPLE_HPP
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#include <cstddef>
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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/utility/forward.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 Index, typename Head, bool IsEmpty>
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class head_base;
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template<std::size_t Index, typename Head>
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class head_base<Index, Head, true>
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: public Head
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{
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public:
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static SPROUT_CONSTEXPR Head& head(head_base& t) SPROUT_NOEXCEPT {
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return t;
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}
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static SPROUT_CONSTEXPR Head const& head(head_base const& t) SPROUT_NOEXCEPT {
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return t;
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}
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public:
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SPROUT_CONSTEXPR head_base()
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: Head()
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{}
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SPROUT_CONSTEXPR head_base(Head const& v)
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: Head(v)
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{}
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template<typename UHead>
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SPROUT_CONSTEXPR head_base(UHead&& v)
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: Head(sprout::forward<UHead>(v))
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{}
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};
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template<std::size_t Index, typename Head>
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class head_base<Index, Head, false> {
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public:
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static SPROUT_CONSTEXPR Head& head(head_base& t) SPROUT_NOEXCEPT {
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return t.head_;
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}
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static SPROUT_CONSTEXPR Head const& head(head_base const& t) SPROUT_NOEXCEPT {
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return t.head_;
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}
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private:
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Head head_;
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public:
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SPROUT_CONSTEXPR head_base()
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: head_()
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{}
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SPROUT_CONSTEXPR head_base(Head const& v)
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: head_(v)
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{}
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template<typename UHead>
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SPROUT_CONSTEXPR head_base(UHead&& v)
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: head_(sprout::forward<UHead>(v))
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{}
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};
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template<std::size_t Index, typename... Types>
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class tuple_impl;
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template<std::size_t Index>
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class tuple_impl<Index> {
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public:
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template<std::size_t, typename...>
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friend class sprout::tuples::detail::tuple_impl;
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protected:
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void swap(tuple_impl&) SPROUT_NOEXCEPT {}
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public:
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tuple_impl() = default;
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};
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template<std::size_t Index, typename Head, typename... Tail>
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class tuple_impl<Index, Head, Tail...>
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: public sprout::tuples::detail::tuple_impl<Index + 1, Tail...>
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, private sprout::tuples::detail::head_base<Index, Head, std::is_empty<Head>::value>
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{
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public:
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template<std::size_t, typename...>
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friend class sprout::tuples::detail::tuple_impl;
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public:
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typedef sprout::tuples::detail::tuple_impl<Index + 1, Tail...> inherited_type;
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typedef sprout::tuples::detail::head_base<Index, Head, std::is_empty<Head>::value> base_type;
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public:
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static SPROUT_CONSTEXPR Head& head(tuple_impl& t) SPROUT_NOEXCEPT {
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return base_type::head(t);
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}
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static SPROUT_CONSTEXPR const Head& head(tuple_impl const& t) SPROUT_NOEXCEPT {
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return base_type::head(t);
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}
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static SPROUT_CONSTEXPR inherited_type& tail(tuple_impl& t) SPROUT_NOEXCEPT {
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return t;
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}
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static SPROUT_CONSTEXPR inherited_type const& tail(tuple_impl const& t) SPROUT_NOEXCEPT {
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return t;
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}
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protected:
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void swap(tuple_impl& t) SPROUT_NOEXCEPT_EXPR(
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SPROUT_NOEXCEPT_EXPR(swap(std::declval<Head&>(), std::declval<Head&>()))
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&& SPROUT_NOEXCEPT_EXPR(tail(t).swap(tail(t)))
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)
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{
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using std::swap;
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swap(head(*this), head(t));
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inherited_type::swap(tail(t));
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}
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public:
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SPROUT_CONSTEXPR tuple_impl()
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: inherited_type()
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, base_type()
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{}
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SPROUT_CONSTEXPR explicit tuple_impl(const Head& h, Tail const&... tail)
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: inherited_type(tail...)
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, base_type(h)
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{}
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template<typename UHead, typename... UTail, typename = typename std::enable_if<sizeof...(Tail) == sizeof...(UTail)>::type>
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SPROUT_CONSTEXPR explicit tuple_impl(UHead&& h, UTail&&... tail)
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: inherited_type(sprout::forward<UTail>(tail)...)
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, base_type(sprout::forward<UHead>(h))
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{}
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SPROUT_CONSTEXPR tuple_impl(tuple_impl const&) = default;
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SPROUT_CONSTEXPR tuple_impl(tuple_impl&& t)
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SPROUT_NOEXCEPT_EXPR(std::is_nothrow_move_constructible<Head>::value && std::is_nothrow_move_constructible<inherited_type>::value)
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: inherited_type(std::move(tail(t)))
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, base_type(sprout::forward<Head>(head(t)))
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{}
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template<typename... UTypes>
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SPROUT_CONSTEXPR tuple_impl(tuple_impl<Index, UTypes...> const& t)
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: inherited_type(sprout::tuples::detail::tuple_impl<Index, UTypes...>::tail(t))
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, base_type(sprout::tuples::detail::tuple_impl<Index, UTypes...>::head(t))
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{}
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template<typename UHead, typename... UTail>
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SPROUT_CONSTEXPR tuple_impl(tuple_impl<Index, UHead, UTail...>&& t)
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: inherited_type(std::move(sprout::tuples::detail::tuple_impl<Index, UHead, UTail...>::tail(t)))
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, base_type(sprout::forward<UHead>(sprout::tuples::detail::tuple_impl<Index, UHead, UTail...>::head(t)))
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{}
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tuple_impl& operator=(tuple_impl const& t) {
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head(*this) = head(t);
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tail(*this) = tail(t);
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return *this;
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}
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tuple_impl& operator=(tuple_impl&& t)
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SPROUT_NOEXCEPT_EXPR(std::is_nothrow_move_assignable<Head>::value && std::is_nothrow_move_assignable<inherited_type>::value)
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{
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head(*this) = sprout::forward<Head>(head(t));
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tail(*this) = std::move(tail(t));
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return *this;
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}
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template<typename... UTypes>
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tuple_impl& operator=(sprout::tuples::detail::tuple_impl<Index, UTypes...> const& t) {
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head(*this) = sprout::tuples::detail::tuple_impl<Index, UTypes...>::head(t);
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tail(*this) = sprout::tuples::detail::tuple_impl<Index, UTypes...>::tail(t);
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return *this;
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}
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template<typename UHead, typename... UTail>
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tuple_impl& operator=(sprout::tuples::detail::tuple_impl<Index, UHead, UTail...>&& t) {
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head(*this) = sprout::forward<UHead>(sprout::tuples::detail::tuple_impl<Index, UHead, UTail...>::head(t));
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tail(*this) = std::move(sprout::tuples::detail::tuple_impl<Index, UHead, UTail...>::tail(t));
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return *this;
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}
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};
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} // namespace detail
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//
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// tuple
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//
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template<typename... Types>
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class tuple
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: public sprout::tuples::detail::tuple_impl<0, Types...>
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{
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public:
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typedef sprout::tuples::detail::tuple_impl<0, Types...> inherited_type;
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public:
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// tuple construction
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SPROUT_CONSTEXPR tuple()
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: inherited_type()
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{}
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SPROUT_CONSTEXPR explicit tuple(Types const&... elements)
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: inherited_type(elements...)
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{}
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template<typename... UTypes, typename = typename std::enable_if<sizeof...(UTypes) == sizeof...(Types)>::type>
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SPROUT_CONSTEXPR explicit tuple(UTypes&&... elements)
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: inherited_type(sprout::forward<UTypes>(elements)...)
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{}
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SPROUT_CONSTEXPR tuple(tuple const &) = default;
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SPROUT_CONSTEXPR tuple(tuple&&) = default;
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template<typename... UTypes, typename = typename std::enable_if<sizeof...(UTypes) == sizeof...(Types)>::type>
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SPROUT_CONSTEXPR tuple(sprout::tuples::tuple<UTypes...> const& t)
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: inherited_type(static_cast<sprout::tuples::detail::tuple_impl<0, UTypes...> const&>(t))
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{}
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template<typename... UTypes, typename = typename std::enable_if<sizeof...(UTypes) == sizeof...(Types)>::type>
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SPROUT_CONSTEXPR tuple(sprout::tuples::tuple<UTypes...>&& t)
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: inherited_type(static_cast<sprout::tuples::detail::tuple_impl<0, UTypes...>&&>(t))
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{}
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// tuple assignment
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tuple& operator=(const tuple& rhs) {
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static_cast<inherited_type&>(*this) = rhs;
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return *this;
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}
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tuple& operator=(tuple&& rhs) SPROUT_NOEXCEPT_EXPR(std::is_nothrow_move_assignable<inherited_type>::value) {
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static_cast<inherited_type&>(*this) = std::move(rhs);
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return *this;
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}
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template<typename... UTypes, typename = typename std::enable_if<sizeof...(UTypes) == sizeof...(Types)>::type>
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tuple& operator=(sprout::tuples::tuple<UTypes...> const& rhs) {
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static_cast<inherited_type&>(*this) = rhs;
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return *this;
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}
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template<typename... UTypes, typename = typename std::enable_if<sizeof...(UTypes) == sizeof...(Types)>::type>
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tuple& operator=(sprout::tuples::tuple<UTypes...>&& rhs) {
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static_cast<inherited_type&>(*this) = std::move(rhs);
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return *this;
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}
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// tuple swap
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void swap(tuple& other) SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(other.swap(other))) {
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inherited_type::swap(other);
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}
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};
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template<>
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class tuple<> {
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public:
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// tuple swap
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void swap(tuple&) SPROUT_NOEXCEPT {}
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};
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//
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// ignore_t
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//
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struct ignore_t {
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template<typename T>
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ignore_t const& operator=(T const&) const {
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return *this;
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}
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};
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//
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// ignore
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//
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static SPROUT_CONSTEXPR ignore_t ignore{};
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//
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// make_tuple
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//
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template<typename... Types>
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SPROUT_CONSTEXPR inline sprout::tuples::tuple<typename std::decay<Types>::type...> make_tuple(Types&&... args) {
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return sprout::tuples::tuple<typename std::decay<Types>::type...>(sprout::forward<Types>(args)...);
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}
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//
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// forward_as_tuple
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//
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template<typename... Types>
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SPROUT_CONSTEXPR inline sprout::tuples::tuple<Types&&...> forward_as_tuple(Types&&... args) SPROUT_NOEXCEPT {
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return sprout::tuples::tuple<Types&&...>(sprout::forward<Types>(args)...);
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}
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//
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// tie
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//
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template<typename... Types>
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inline sprout::tuples::tuple<Types&...> tie(Types&... args) SPROUT_NOEXCEPT {
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return sprout::tuples::tuple<Types&...>(args...);
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}
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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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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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template<typename... Types>
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struct tuple_size<sprout::tuples::tuple<Types...> >
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: public std::integral_constant<std::size_t, sizeof...(Types)>
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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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template<std::size_t I, typename T>
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struct tuple_element<I, T const> {
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public:
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typedef typename std::add_const<typename sprout::tuples::tuple_element<I, T>::type>::type type;
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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:
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typedef typename std::add_volatile<typename sprout::tuples::tuple_element<I, T>::type>::type type;
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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:
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typedef typename std::add_cv<typename sprout::tuples::tuple_element<I, T>::type>::type type;
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};
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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<typename Head, typename... Tail>
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struct tuple_element_impl<0, sprout::tuples::tuple<Head, Tail...> > {
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public:
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typedef Head type;
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};
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template<std::size_t I, typename Head, typename... Tail>
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struct tuple_element_impl<I, sprout::tuples::tuple<Head, Tail...> >
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: public sprout::tuples::tuple_element<I - 1, sprout::tuples::tuple<Tail...> >
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{};
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} // namespace detail
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template<std::size_t I, typename... Types>
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struct tuple_element<I, sprout::tuples::tuple<Types...> >
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: public sprout::tuples::detail::tuple_element_impl<I, sprout::tuples::tuple<Types...> >
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{};
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//
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// get
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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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SPROUT_CONSTEXPR typename std::add_lvalue_reference<Head>::type get_helper(
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sprout::tuples::detail::tuple_impl<I, Head, Tail...>& t
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) SPROUT_NOEXCEPT
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{
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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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SPROUT_CONSTEXPR typename std::add_lvalue_reference<typename std::add_const<Head>::type>::type get_helper(
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sprout::tuples::detail::tuple_impl<I, Head, Tail...> const& t
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) SPROUT_NOEXCEPT
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{
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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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template<std::size_t I, typename... Types>
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SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type& get(
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tuple<Types...>& t
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) SPROUT_NOEXCEPT
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{
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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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SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type&& get(
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tuple<Types...>&& t
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) SPROUT_NOEXCEPT
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{
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return sprout::forward<typename 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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SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >::type const& get(
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tuple<Types...> const& t
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) SPROUT_NOEXCEPT
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{
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return sprout::tuples::detail::get_helper<I>(t);
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}
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//
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// swap
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//
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template<typename... Types>
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inline void swap(tuple<Types...>& lhs, tuple<Types...>& rhs) SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs))) {
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lhs.swap(rhs);
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}
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} // namespace tuples
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using sprout::tuples::tuple;
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using sprout::tuples::ignore;
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using sprout::tuples::make_tuple;
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using sprout::tuples::forward_as_tuple;
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using sprout::tuples::tie;
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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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using sprout::tuples::swap;
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} // namespace sprout
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namespace std {
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//
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// tuple_size
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//
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template<typename... Types>
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struct tuple_size<sprout::tuples::tuple<Types...> >
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: public sprout::tuples::tuple_size<sprout::tuples::tuple<Types...> >
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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... Types>
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struct tuple_element<I, sprout::tuples::tuple<Types...> >
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: public sprout::tuples::tuple_element<I, sprout::tuples::tuple<Types...> >
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{};
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} // namespace std
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#endif // #ifndef SPROUT_TUPLE_TUPLE_HPP
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