mirror of
https://github.com/LadybirdBrowser/ladybird.git
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227 lines
4.6 KiB
C++
227 lines
4.6 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/StdLibExtras.h>
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#include <AK/TypeList.h>
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namespace AK::Detail {
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template<typename... Ts>
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struct Tuple {
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};
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template<typename T>
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struct Tuple<T> {
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Tuple(T&& value)
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requires(!IsSame < T &&, T const& >)
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: value(forward<T>(value))
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{
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}
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Tuple(T const& value)
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: value(value)
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{
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}
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template<typename U>
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U& get()
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{
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static_assert(IsSame<T, U>, "Invalid tuple access");
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return value;
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}
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template<typename U>
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U const& get() const
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{
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return const_cast<Tuple<T>&>(*this).get<U>();
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}
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template<typename U, unsigned index>
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U& get_with_index()
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{
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static_assert(IsSame<T, U> && index == 0, "Invalid tuple access");
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return value;
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}
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template<typename U, unsigned index>
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U const& get_with_index() const
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{
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return const_cast<Tuple<T>&>(*this).get_with_index<U, index>();
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}
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private:
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T value;
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};
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template<typename T, typename... TRest>
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struct Tuple<T, TRest...> : Tuple<TRest...> {
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template<typename FirstT, typename... RestT>
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Tuple(FirstT&& first, RestT&&... rest)
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: Tuple<TRest...>(forward<RestT>(rest)...)
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, value(forward<FirstT>(first))
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{
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}
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Tuple(T&& first, TRest&&... rest)
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: Tuple<TRest...>(move(rest)...)
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, value(move(first))
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{
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}
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template<typename U>
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U& get()
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{
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if constexpr (IsSame<T, U>)
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return value;
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else
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return Tuple<TRest...>::template get<U>();
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}
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template<typename U>
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U const& get() const
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{
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return const_cast<Tuple<T, TRest...>&>(*this).get<U>();
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}
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template<typename U, unsigned index>
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U& get_with_index()
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{
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if constexpr (IsSame<T, U> && index == 0)
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return value;
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else
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return Tuple<TRest...>::template get_with_index<U, index - 1>();
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}
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template<typename U, unsigned index>
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U const& get_with_index() const
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{
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return const_cast<Tuple<T, TRest...>&>(*this).get_with_index<U, index>();
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}
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private:
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T value;
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};
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}
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namespace AK {
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template<typename... Ts>
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struct Tuple : Detail::Tuple<Ts...> {
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using Types = TypeList<Ts...>;
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using Detail::Tuple<Ts...>::Tuple;
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using Indices = MakeIndexSequence<sizeof...(Ts)>;
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Tuple(Tuple&& other)
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: Tuple(move(other), Indices())
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{
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}
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Tuple(Tuple const& other)
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: Tuple(other, Indices())
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{
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}
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Tuple& operator=(Tuple&& other)
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{
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set(move(other), Indices());
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return *this;
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}
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Tuple& operator=(Tuple const& other)
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{
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set(other, Indices());
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return *this;
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}
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template<typename T>
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auto& get()
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{
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return Detail::Tuple<Ts...>::template get<T>();
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}
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template<unsigned index>
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auto& get()
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{
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return Detail::Tuple<Ts...>::template get_with_index<typename Types::template Type<index>, index>();
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}
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template<typename T>
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auto& get() const
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{
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return Detail::Tuple<Ts...>::template get<T>();
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}
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template<unsigned index>
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auto& get() const
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{
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return Detail::Tuple<Ts...>::template get_with_index<typename Types::template Type<index>, index>();
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}
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template<typename F>
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auto apply_as_args(F&& f)
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{
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return apply_as_args(forward<F>(f), Indices());
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}
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template<typename F>
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auto apply_as_args(F&& f) const
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{
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return apply_as_args(forward<F>(f), Indices());
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}
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static constexpr auto size() { return sizeof...(Ts); }
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private:
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template<unsigned... Is>
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Tuple(Tuple&& other, IndexSequence<Is...>)
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: Detail::Tuple<Ts...>(move(other.get<Is>())...)
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{
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}
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template<unsigned... Is>
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Tuple(Tuple const& other, IndexSequence<Is...>)
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: Detail::Tuple<Ts...>(other.get<Is>()...)
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{
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}
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template<unsigned... Is>
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void set(Tuple&& other, IndexSequence<Is...>)
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{
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((get<Is>() = move(other.get<Is>())), ...);
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}
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template<unsigned... Is>
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void set(Tuple const& other, IndexSequence<Is...>)
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{
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((get<Is>() = other.get<Is>()), ...);
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}
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template<typename F, unsigned... Is>
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auto apply_as_args(F&& f, IndexSequence<Is...>)
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{
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return forward<F>(f)(get<Is>()...);
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}
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template<typename F, unsigned... Is>
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auto apply_as_args(F&& f, IndexSequence<Is...>) const
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{
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return forward<F>(f)(get<Is>()...);
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}
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};
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template<class... Args>
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Tuple(Args... args) -> Tuple<Args...>;
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}
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#if USING_AK_GLOBALLY
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using AK::Tuple;
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#endif
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