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AK: Add a CommonType<Ts...> type trait
Also adds a simple-ish test for CommonType.
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parent
ccd19d464e
commit
6c9ef20010
Notes:
sideshowbarker
2024-07-18 08:32:13 +09:00
Author: https://github.com/alimpfard Commit: https://github.com/SerenityOS/serenity/commit/6c9ef200105 Pull-request: https://github.com/SerenityOS/serenity/pull/8933
@ -319,6 +319,30 @@ struct __MakeSigned<char> {
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template<typename T>
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using MakeSigned = typename __MakeSigned<T>::Type;
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template<typename T>
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auto declval() -> T;
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template<typename...>
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struct __CommonType;
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template<typename T>
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struct __CommonType<T> {
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using Type = T;
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};
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template<typename T1, typename T2>
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struct __CommonType<T1, T2> {
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using Type = decltype(true ? declval<T1>() : declval<T2>());
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};
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template<typename T1, typename T2, typename... Ts>
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struct __CommonType<T1, T2, Ts...> {
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using Type = typename __CommonType<typename __CommonType<T1, T2>::Type, Ts...>::Type;
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};
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template<typename... Ts>
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using CommonType = typename __CommonType<Ts...>::Type;
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template<class T>
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inline constexpr bool IsVoid = IsSame<void, RemoveCV<T>>;
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@ -457,9 +481,6 @@ inline constexpr bool IsTrivial = __is_trivial(T);
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template<typename T>
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inline constexpr bool IsTriviallyCopyable = __is_trivially_copyable(T);
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template<typename T>
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auto declval() -> T;
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template<typename T, typename... Args>
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inline constexpr bool IsCallableWithArguments = requires(T t) { t(declval<Args>()...); };
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@ -515,6 +536,7 @@ inline constexpr bool IsTriviallyMoveAssignable = IsTriviallyAssignable<AddLvalu
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using AK::Detail::AddConst;
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using AK::Detail::AddLvalueReference;
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using AK::Detail::AddRvalueReference;
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using AK::Detail::CommonType;
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using AK::Detail::Conditional;
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using AK::Detail::CopyConst;
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using AK::Detail::declval;
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@ -246,3 +246,23 @@ TEST_CASE(IsDestructible)
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EXPECT_TRAIT_FALSE(IsDestructible, C);
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EXPECT_TRAIT_FALSE(IsTriviallyDestructible, C);
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}
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TEST_CASE(CommonType)
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{
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using TCommon0 = CommonType<int, float, char>;
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EXPECT_VARIADIC_TRAIT_TRUE(IsSame, TCommon0, float);
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using TCommon1 = CommonType<int, int, int, char>;
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EXPECT_VARIADIC_TRAIT_TRUE(IsSame, TCommon1, int);
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struct Foo {
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};
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using TCommon2 = CommonType<Foo, Foo, Foo>;
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EXPECT_VARIADIC_TRAIT_TRUE(IsSame, TCommon2, Foo);
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struct Bar {
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operator Foo();
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};
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using TCommon3 = CommonType<Bar, Foo, Bar>;
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EXPECT_VARIADIC_TRAIT_TRUE(IsSame, TCommon3, Foo);
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}
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