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AK: Add type traits describing supported operations

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This will allow us to make `Optional`, `Variant`, and possibly other
data structures conditionally trivially constructible, destructible,
copyable or movable based on their type parameters.
This commit is contained in:
Daniel Bertalan 2021-07-02 17:15:59 +02:00 committed by Ali Mohammad Pur
parent e480d69130
commit 84ddecae8a
Notes: sideshowbarker 2024-07-18 10:31:21 +09:00 
Author: https://github.com/BertalanD
Commit: https://github.com/SerenityOS/serenity/commit/84ddecae8ad
Pull-request: https://github.com/SerenityOS/serenity/pull/8391
Reviewed-by: https://github.com/alimpfard
1 changed files with 80 additions and 0 deletions
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80
AK/StdLibExtraDetails.h
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@ -1,6 +1,7 @@
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2021, Daniel Bertalan <dani@danielbertalan.dev>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -429,6 +430,24 @@ struct __IdentityType {
template<typename T>
using IdentityType = typename __IdentityType<T>::Type;
template<typename T, typename = void>
struct __AddReference {
using LvalueType = T;
using TvalueType = T;
};
template<typename T>
struct __AddReference<T, VoidType<T&>> {
using LvalueType = T&;
using RvalueType = T&&;
};
template<typename T>
using AddLvalueReference = typename __AddReference<T>::LvalueType;
template<typename T>
using AddRvalueReference = typename __AddReference<T>::RvalueType;
template<class T>
requires(IsEnum<T>) using UnderlyingType = __underlying_type(T);
@ -447,8 +466,55 @@ inline constexpr bool IsCallableWithArguments = requires(T t) { t(declval<Args>(
template<typename T, typename... Args>
inline constexpr bool IsConstructible = requires { ::new T(declval<Args>()...); };
template<typename T, typename... Args>
inline constexpr bool IsTriviallyConstructible = __is_trivially_constructible(T, Args...);
template<typename From, typename To>
inline constexpr bool IsConvertible = requires { declval<void (*)(To)>()(declval<From>()); };
template<typename T, typename U>
inline constexpr bool IsAssignable = requires { declval<T>() = declval<U>(); };
template<typename T, typename U>
inline constexpr bool IsTriviallyAssignable = __is_trivially_assignable(T, U);
template<typename T>
inline constexpr bool IsDestructible = requires { declval<T>().~T(); };
template<typename T>
#if defined(__clang__)
inline constexpr bool IsTriviallyDestructible = __is_trivially_destructible(T);
#else
inline constexpr bool IsTriviallyDestructible = __has_trivial_destructor(T) && IsDestructible<T>;
#endif
template<typename T>
inline constexpr bool IsCopyConstructible = IsConstructible<T, AddLvalueReference<AddConst<T>>>;
template<typename T>
inline constexpr bool IsTriviallyCopyConstructible = IsTriviallyConstructible<T, AddLvalueReference<AddConst<T>>>;
template<typename T>
inline constexpr bool IsCopyAssignable = IsAssignable<AddLvalueReference<T>, AddLvalueReference<AddConst<T>>>;
template<typename T>
inline constexpr bool IsTriviallyCopyAssignable = IsTriviallyAssignable<AddLvalueReference<T>, AddLvalueReference<AddConst<T>>>;
template<typename T>
inline constexpr bool IsMoveConstructible = IsConstructible<T, AddRvalueReference<T>>;
template<typename T>
inline constexpr bool IsTriviallyMoveConstructible = IsTriviallyConstructible<T, AddRvalueReference<T>>;
template<typename T>
inline constexpr bool IsMoveAssignable = IsAssignable<AddLvalueReference<T>, AddRvalueReference<T>>;
template<typename T>
inline constexpr bool IsTriviallyMoveAssignable = IsTriviallyAssignable<AddLvalueReference<T>, AddRvalueReference<T>>;
}
using AK::Detail::AddConst;
using AK::Detail::AddLvalueReference;
using AK::Detail::AddRvalueReference;
using AK::Detail::Conditional;
using AK::Detail::CopyConst;
using AK::Detail::declval;
@ -459,24 +525,38 @@ using AK::Detail::IdentityType;
using AK::Detail::IndexSequence;
using AK::Detail::IntegerSequence;
using AK::Detail::IsArithmetic;
using AK::Detail::IsAssignable;
using AK::Detail::IsBaseOf;
using AK::Detail::IsCallableWithArguments;
using AK::Detail::IsClass;
using AK::Detail::IsConst;
using AK::Detail::IsConstructible;
using AK::Detail::IsConvertible;
using AK::Detail::IsCopyAssignable;
using AK::Detail::IsCopyConstructible;
using AK::Detail::IsDestructible;
using AK::Detail::IsEnum;
using AK::Detail::IsFloatingPoint;
using AK::Detail::IsFunction;
using AK::Detail::IsFundamental;
using AK::Detail::IsIntegral;
using AK::Detail::IsLvalueReference;
using AK::Detail::IsMoveAssignable;
using AK::Detail::IsMoveConstructible;
using AK::Detail::IsNullPointer;
using AK::Detail::IsPointer;
using AK::Detail::IsRvalueReference;
using AK::Detail::IsSame;
using AK::Detail::IsSigned;
using AK::Detail::IsTrivial;
using AK::Detail::IsTriviallyAssignable;
using AK::Detail::IsTriviallyConstructible;
using AK::Detail::IsTriviallyCopyable;
using AK::Detail::IsTriviallyCopyAssignable;
using AK::Detail::IsTriviallyCopyConstructible;
using AK::Detail::IsTriviallyDestructible;
using AK::Detail::IsTriviallyMoveAssignable;
using AK::Detail::IsTriviallyMoveConstructible;
using AK::Detail::IsUnion;
using AK::Detail::IsUnsigned;
using AK::Detail::IsVoid;