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AK: Add a Tuple implementation
Please don't use this outside of metaprogramming needs, *please*.
This commit is contained in:
Ali Mohammad Pur
Linus Groh
parent
4fdbac236d
commit
02de813950
Notes:
sideshowbarker
2024-07-18 18:20:26 +09:00
Author: https://github.com/alimpfard Commit: https://github.com/SerenityOS/serenity/commit/02de813950f Pull-request: https://github.com/SerenityOS/serenity/pull/6978 Reviewed-by: https://github.com/Quaker762 ✅ Reviewed-by: https://github.com/sunverwerth ✅
3 changed files with 328 additions and 0 deletions
218
AK/Tuple.h
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218
AK/Tuple.h
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/*
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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) requires(!IsSame<T&&, const T&>)
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: value(forward<T>(value))
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{
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}
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Tuple(const T& 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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const U& 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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const U& 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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Tuple(T&& first, TRest&&... rest)
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: Tuple<TRest...>(forward<TRest>(rest)...)
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, value(forward<T>(first))
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{
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}
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Tuple(const T& first, const TRest&... rest)
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: Tuple<TRest...>(rest...)
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, value(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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const U& 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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const U& 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(const Tuple& 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=(const Tuple& 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(const Tuple& 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(const Tuple& 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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}
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using AK::Tuple;
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@ -52,6 +52,7 @@ set(AK_TEST_SOURCES
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TestStringView.cpp
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TestTime.cpp
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TestTrie.cpp
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TestTuple.cpp
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TestTypeTraits.cpp
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TestTypedTransfer.cpp
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TestURL.cpp
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109
Tests/AK/TestTuple.cpp
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109
Tests/AK/TestTuple.cpp
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@ -0,0 +1,109 @@
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/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenity.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestSuite.h>
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#include <AK/Tuple.h>
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TEST_CASE(basic)
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{
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Tuple<int, String> value { 1, "foo" };
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EXPECT_EQ(value.get<int>(), 1);
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EXPECT_EQ(value.get<String>(), "foo");
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EXPECT_EQ(value.get<0>(), 1);
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EXPECT_EQ(value.get<1>(), "foo");
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// Move assignment
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value = { 2, "bar" };
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EXPECT_EQ(value.get<int>(), 2);
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EXPECT_EQ(value.get<String>(), "bar");
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EXPECT_EQ(value.get<0>(), 2);
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EXPECT_EQ(value.get<1>(), "bar");
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// Copy ctor
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auto other_value { value };
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EXPECT_EQ(other_value.get<int>(), 2);
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EXPECT_EQ(other_value.get<String>(), "bar");
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EXPECT_EQ(other_value.get<0>(), 2);
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EXPECT_EQ(other_value.get<1>(), "bar");
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// Move ctor
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auto moved_to_value { move(value) };
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EXPECT_EQ(moved_to_value.get<int>(), 2);
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EXPECT_EQ(moved_to_value.get<String>(), "bar");
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EXPECT_EQ(moved_to_value.get<0>(), 2);
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EXPECT_EQ(moved_to_value.get<1>(), "bar");
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// Copy assignment
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value = moved_to_value;
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EXPECT_EQ(moved_to_value.get<int>(), 2);
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EXPECT_EQ(moved_to_value.get<String>(), "bar");
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EXPECT_EQ(moved_to_value.get<0>(), 2);
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EXPECT_EQ(moved_to_value.get<1>(), "bar");
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EXPECT_EQ(value.get<int>(), 2);
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EXPECT_EQ(value.get<String>(), "bar");
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EXPECT_EQ(value.get<0>(), 2);
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EXPECT_EQ(value.get<1>(), "bar");
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}
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TEST_CASE(no_copy)
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{
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struct NoCopy {
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AK_MAKE_NONCOPYABLE(NoCopy);
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public:
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NoCopy(NoCopy&&) = default;
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NoCopy() = default;
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};
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// Deleted copy ctor should not cause an issue so long as the value isn't copied.
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Tuple<NoCopy, int, int> value { {}, 1, 2 };
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auto foo = move(value);
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EXPECT_EQ(foo.get<1>(), 1);
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EXPECT_EQ(foo.get<2>(), 2);
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}
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TEST_CASE(apply)
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{
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Tuple<int, int, String> args { 1, 2, "foo" };
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// With copy
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{
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bool was_called = false;
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args.apply_as_args([&](int a, int b, String c) {
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was_called = true;
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EXPECT_EQ(a, 1);
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EXPECT_EQ(b, 2);
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EXPECT_EQ(c, "foo");
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});
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EXPECT(was_called);
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}
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// With reference
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{
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bool was_called = false;
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args.apply_as_args([&](int& a, int& b, String& c) {
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was_called = true;
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EXPECT_EQ(a, 1);
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EXPECT_EQ(b, 2);
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EXPECT_EQ(c, "foo");
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});
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EXPECT(was_called);
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}
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// With const reference, taken from a const tuple
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{
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bool was_called = false;
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const auto& args_ref = args;
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args_ref.apply_as_args([&](const int& a, const int& b, const String& c) {
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was_called = true;
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EXPECT_EQ(a, 1);
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EXPECT_EQ(b, 2);
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EXPECT_EQ(c, "foo");
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});
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EXPECT(was_called);
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}
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}
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