513 lines
19 KiB
C++
513 lines
19 KiB
C++
#pragma once
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#include "CoreTypes.h"
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#include "Memory/Memory.h"
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#include "Memory/Alignment.h"
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#include "Templates/Utility.h"
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#include "Templates/TypeHash.h"
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#include "Memory/MemoryOperator.h"
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#include "TypeTraits/TypeTraits.h"
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#include "Miscellaneous/AssertionMacros.h"
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NAMESPACE_REDCRAFT_BEGIN
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NAMESPACE_MODULE_BEGIN(Redcraft)
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NAMESPACE_MODULE_BEGIN(Utility)
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// TAny's CustomStorage concept, see FAnyDefaultStorage.
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template <typename T>
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concept CAnyCustomStorage =
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// CSameAs<decltype(T::InlineSize), const size_t> &&
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// CSameAs<decltype(T::InlineAlignment), const size_t> &&
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requires(const T& A)
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{
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{ A.InlineAllocation() } -> CSameAs<const void*>;
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{ A.HeapAllocation() } -> CSameAs<void*>;
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{ A.TypeInfo() } -> CSameAs<uintptr>;
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} &&
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requires(T& A)
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{
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{ A.InlineAllocation() } -> CSameAs<void*>;
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{ A.HeapAllocation() } -> CSameAs<void*&>;
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{ A.TypeInfo() } -> CSameAs<uintptr&>;
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} &&
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requires(T& A, const T& B, T&& C)
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{
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A.CopyCustom(B);
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A.MoveCustom(MoveTemp(C));
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};
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// TAny's default storage structure.
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struct alignas(16) FAnyDefaultStorage
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{
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// The built-in copy/move operators are disabled and CopyCustom/MoveCustom is used instead of them.
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// You can add custom variables like this.
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//Type Variable;
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//~ Begin CAnyCustomStorage Interface
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inline static constexpr size_t InlineSize = 64 - sizeof(uintptr);
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inline static constexpr size_t InlineAlignment = 16;
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constexpr void* InlineAllocation() { return &InlineAllocationImpl; }
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constexpr const void* InlineAllocation() const { return &InlineAllocationImpl; }
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constexpr void*& HeapAllocation() { return HeapAllocationImpl; }
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constexpr void* HeapAllocation() const { return HeapAllocationImpl; }
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constexpr uintptr& TypeInfo() { return TypeInfoImpl; }
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constexpr uintptr TypeInfo() const { return TypeInfoImpl; }
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constexpr void CopyCustom(const FAnyDefaultStorage& InValue) { /* Variable = InValue.Variable; */ } // You just need to copy the custom variables.
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constexpr void MoveCustom( FAnyDefaultStorage&& InValue) { /* Variable = MoveTemp(InValue.Variable); */ } // You just need to move the custom variables.
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//~ End CAnyCustomStorage Interface
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union
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{
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uint8 InlineAllocationImpl[InlineSize];
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void* HeapAllocationImpl;
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};
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uintptr TypeInfoImpl;
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};
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static_assert(CAnyCustomStorage<FAnyDefaultStorage>);
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// You can add custom storage area through CustomStorage, such as TFunction.
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// It is not recommended to use this, FAny is recommended.
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template <CAnyCustomStorage CustomStorage = FAnyDefaultStorage>
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class TAny
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{
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public:
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inline static constexpr size_t InlineSize = CustomStorage::InlineSize;
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inline static constexpr size_t InlineAlignment = CustomStorage::InlineAlignment;
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constexpr TAny() { Storage.TypeInfo() = 0; }
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constexpr TAny(FInvalid) : TAny() { }
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FORCEINLINE TAny(const TAny& InValue)
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{
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Storage.CopyCustom(InValue.Storage);
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Storage.TypeInfo() = InValue.Storage.TypeInfo();
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if (!IsValid()) return;
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switch (GetRepresentation())
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{
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case ERepresentation::Trivial:
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Memory::Memcpy(Storage.InlineAllocation(), InValue.Storage.InlineAllocation(), Storage.InlineSize);
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break;
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case ERepresentation::Small:
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GetTypeInfoImpl().CopyConstructImpl(GetAllocation(), InValue.GetAllocation());
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break;
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case ERepresentation::Big:
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Storage.HeapAllocation() = Memory::Malloc(GetTypeInfoImpl().TypeSize, GetTypeInfoImpl().TypeAlignment);
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GetTypeInfoImpl().CopyConstructImpl(GetAllocation(), InValue.GetAllocation());
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break;
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default: check_no_entry();
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}
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}
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FORCEINLINE TAny(TAny&& InValue)
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{
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Storage.MoveCustom(MoveTemp(InValue.Storage));
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Storage.TypeInfo() = InValue.Storage.TypeInfo();
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if (!IsValid()) return;
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switch (GetRepresentation())
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{
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case ERepresentation::Trivial:
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Memory::Memcpy(Storage.InlineAllocation(), InValue.Storage.InlineAllocation(), Storage.InlineSize);
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break;
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case ERepresentation::Small:
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GetTypeInfoImpl().MoveConstructImpl(GetAllocation(), InValue.GetAllocation());
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break;
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case ERepresentation::Big:
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Storage.HeapAllocation() = InValue.Storage.HeapAllocation();
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InValue.Storage.TypeInfo() = 0;
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break;
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default: check_no_entry();
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}
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}
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template <typename T, typename... Ts> requires CDestructible<TDecay<T>>
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&& CConstructibleFrom<TDecay<T>, Ts&&...>
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FORCEINLINE explicit TAny(TInPlaceType<T>, Ts&&... Args)
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{
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using SelectedType = TDecay<T>;
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EmplaceImpl<SelectedType>(Forward<Ts>(Args)...);
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}
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template <typename T> requires (!CSameAs<TDecay<T>, TAny>) && (!CTInPlaceType<TDecay<T>>)
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&& CDestructible<TDecay<T>> && CConstructibleFrom<TDecay<T>, T&&>
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FORCEINLINE TAny(T&& InValue) : TAny(InPlaceType<TDecay<T>>, Forward<T>(InValue))
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{ }
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FORCEINLINE ~TAny()
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{
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ResetImpl();
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}
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FORCEINLINE TAny& operator=(const TAny& InValue)
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{
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if (&InValue == this) return *this;
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Storage.CopyCustom(InValue.Storage);
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if (!InValue.IsValid())
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{
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Reset();
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}
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else if (GetTypeInfo() == InValue.GetTypeInfo())
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{
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switch (GetRepresentation())
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{
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case ERepresentation::Trivial:
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Memory::Memcpy(Storage.InlineAllocation(), InValue.Storage.InlineAllocation(), Storage.InlineSize);
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break;
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case ERepresentation::Small:
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case ERepresentation::Big:
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GetTypeInfoImpl().CopyAssignImpl(GetAllocation(), InValue.GetAllocation());
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break;
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default: check_no_entry();
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}
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}
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else
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{
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ResetImpl();
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Storage.TypeInfo() = InValue.Storage.TypeInfo();
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switch (GetRepresentation())
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{
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case ERepresentation::Trivial:
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Memory::Memcpy(Storage.InlineAllocation(), InValue.Storage.InlineAllocation(), Storage.InlineSize);
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break;
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case ERepresentation::Small:
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GetTypeInfoImpl().CopyConstructImpl(GetAllocation(), InValue.GetAllocation());
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break;
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case ERepresentation::Big:
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Storage.HeapAllocation() = Memory::Malloc(GetTypeInfoImpl().TypeSize, GetTypeInfoImpl().TypeAlignment);
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GetTypeInfoImpl().CopyConstructImpl(GetAllocation(), InValue.GetAllocation());
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break;
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default: check_no_entry();
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}
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}
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return *this;
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}
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FORCEINLINE TAny& operator=(TAny&& InValue)
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{
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if (&InValue == this) return *this;
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Storage.MoveCustom(MoveTemp(InValue.Storage));
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if (!InValue.IsValid())
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{
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Reset();
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}
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else if (GetTypeInfo() == InValue.GetTypeInfo())
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{
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switch (GetRepresentation())
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{
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case ERepresentation::Trivial:
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Memory::Memcpy(Storage.InlineAllocation(), InValue.Storage.InlineAllocation(), Storage.InlineSize);
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break;
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case ERepresentation::Small:
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GetTypeInfoImpl().MoveAssignImpl(GetAllocation(), InValue.GetAllocation());
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break;
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case ERepresentation::Big:
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ResetImpl();
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Storage.HeapAllocation() = InValue.Storage.HeapAllocation();
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InValue.Storage.TypeInfo() = 0;
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break;
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default: check_no_entry();
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}
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}
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else
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{
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ResetImpl();
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Storage.TypeInfo() = InValue.Storage.TypeInfo();
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switch (GetRepresentation())
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{
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case ERepresentation::Trivial:
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Memory::Memcpy(Storage.InlineAllocation(), InValue.Storage.InlineAllocation(), Storage.InlineSize);
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break;
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case ERepresentation::Small:
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GetTypeInfoImpl().MoveConstructImpl(GetAllocation(), InValue.GetAllocation());
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break;
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case ERepresentation::Big:
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Storage.HeapAllocation() = InValue.Storage.HeapAllocation();
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InValue.Storage.TypeInfo() = 0;
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break;
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default: check_no_entry();
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}
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}
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return *this;
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}
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template <typename T> requires (!CSameAs<TDecay<T>, TAny>) && (!CTInPlaceType<TDecay<T>>)
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&& CDestructible<TDecay<T>> && CConstructibleFrom<TDecay<T>, T&&>
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FORCEINLINE TAny& operator=(T&& InValue)
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{
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using SelectedType = TDecay<T>;
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if (HoldsAlternative<SelectedType>())
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{
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GetValue<SelectedType>() = Forward<T>(InValue);
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}
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else
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{
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ResetImpl();
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EmplaceImpl<SelectedType>(Forward<T>(InValue));
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}
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return *this;
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}
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template <typename T, typename... Ts> requires CDestructible<TDecay<T>>
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&& CConstructibleFrom<TDecay<T>, Ts&&...>
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FORCEINLINE TDecay<T>& Emplace(Ts&&... Args)
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{
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ResetImpl();
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using SelectedType = TDecay<T>;
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EmplaceImpl<SelectedType>(Forward<Ts>(Args)...);
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return GetValue<SelectedType>();
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}
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constexpr const type_info& GetTypeInfo() const { return IsValid() ? *GetTypeInfoImpl().NativeTypeInfo : typeid(void); }
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constexpr bool IsValid() const { return Storage.TypeInfo() != 0; }
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constexpr explicit operator bool() const { return Storage.TypeInfo() != 0; }
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template <typename T> constexpr bool HoldsAlternative() const { return IsValid() ? GetTypeInfo() == typeid(T) : false; }
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template <typename T> requires CDestructible<TDecay<T>>
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constexpr T& GetValue() & { checkf(HoldsAlternative<T>(), TEXT("It is an error to call GetValue() on an wrong TAny. Please either check HoldsAlternative() or use Get(DefaultValue) instead.")); return *reinterpret_cast< T*>(GetAllocation()); }
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template <typename T> requires CDestructible<TDecay<T>>
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constexpr T&& GetValue() && { checkf(HoldsAlternative<T>(), TEXT("It is an error to call GetValue() on an wrong TAny. Please either check HoldsAlternative() or use Get(DefaultValue) instead.")); return MoveTemp(*reinterpret_cast< T*>(GetAllocation())); }
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template <typename T> requires CDestructible<TDecay<T>>
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constexpr const T& GetValue() const& { checkf(HoldsAlternative<T>(), TEXT("It is an error to call GetValue() on an wrong TAny. Please either check HoldsAlternative() or use Get(DefaultValue) instead.")); return *reinterpret_cast<const T*>(GetAllocation()); }
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template <typename T> requires CDestructible<TDecay<T>>
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constexpr const T&& GetValue() const&& { checkf(HoldsAlternative<T>(), TEXT("It is an error to call GetValue() on an wrong TAny. Please either check HoldsAlternative() or use Get(DefaultValue) instead.")); return MoveTemp(*reinterpret_cast<const T*>(GetAllocation())); }
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template <typename T> requires CSameAs<T, TDecay<T>>&& CDestructible<TDecay<T>>
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constexpr T& Get( T& DefaultValue) & { return HoldsAlternative<T>() ? GetValue<T>() : DefaultValue; }
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template <typename T> requires CSameAs<T, TDecay<T>>&& CDestructible<TDecay<T>>
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constexpr const T& Get(const T& DefaultValue) const& { return HoldsAlternative<T>() ? GetValue<T>() : DefaultValue; }
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constexpr CustomStorage& GetCustomStorage() requires (!CSameAs<CustomStorage, FAnyDefaultStorage>) { return Storage; }
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constexpr const CustomStorage& GetCustomStorage() const requires (!CSameAs<CustomStorage, FAnyDefaultStorage>) { return Storage; }
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FORCEINLINE void Reset()
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{
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ResetImpl();
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Storage.TypeInfo() = 0;
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}
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FORCEINLINE size_t GetTypeHash() const
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{
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using NAMESPACE_REDCRAFT::GetTypeHash;
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if (!IsValid()) return 20090007;
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return HashCombine(GetTypeHash(GetTypeInfo()), GetTypeInfoImpl().HashImpl(GetAllocation()));
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}
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FORCEINLINE void Swap(TAny& InValue)
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{
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if (!IsValid() && !InValue.IsValid()) return;
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if (IsValid() && !InValue.IsValid())
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{
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InValue = MoveTemp(*this);
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Reset();
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return;
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}
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if (InValue.IsValid() && !IsValid())
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{
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*this = MoveTemp(InValue);
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InValue.Reset();
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return;
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}
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if (GetTypeInfo() == InValue.GetTypeInfo())
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{
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GetTypeInfoImpl().SwapImpl(GetAllocation(), InValue.GetAllocation());
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return;
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}
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TAny Temp = MoveTemp(*this);
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*this = MoveTemp(InValue);
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InValue = MoveTemp(Temp);
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}
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private:
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CustomStorage Storage;
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static constexpr uintptr_t RepresentationMask = 3;
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enum class ERepresentation : uint8
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{
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Trivial, // Trivial & Inline
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Small, // InlineAllocation
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Big, // HeapAllocation
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};
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struct FTypeInfoImpl
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{
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const type_info* NativeTypeInfo;
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const size_t TypeSize;
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const size_t TypeAlignment;
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using FCopyConstructImpl = void(*)(void*, const void*);
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using FMoveConstructImpl = void(*)(void*, void*);
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using FCopyAssignImpl = void(*)(void*, const void*);
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using FMoveAssignImpl = void(*)(void*, void*);
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using FDestroyImpl = void(*)(void* );
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using FEqualityCompareImpl = bool (*)(const void*, const void*);
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using FSynthThreeWayCompareImpl = partial_ordering (*)(const void*, const void*);
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using FHashImpl = size_t (*)(const void* );
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using FSwapImpl = void (*)( void*, void*);
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const FCopyConstructImpl CopyConstructImpl;
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const FMoveConstructImpl MoveConstructImpl;
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const FCopyAssignImpl CopyAssignImpl;
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const FMoveAssignImpl MoveAssignImpl;
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const FDestroyImpl DestroyImpl;
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const FEqualityCompareImpl EqualityCompareImpl;
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const FSynthThreeWayCompareImpl SynthThreeWayCompareImpl;
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const FHashImpl HashImpl;
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const FSwapImpl SwapImpl;
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template <typename T>
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constexpr FTypeInfoImpl(TInPlaceType<T>)
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: NativeTypeInfo (&typeid(T))
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, TypeSize ( sizeof(T))
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, TypeAlignment (alignof(T))
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, CopyConstructImpl ([](void* A, const void* B) { if constexpr (requires(T* A, const T* B) { Memory::CopyConstruct (A, B); }) Memory::CopyConstruct (reinterpret_cast<T*>(A), reinterpret_cast<const T*>(B)); else checkf(false, TEXT("The type '%s' is not copy constructible."), typeid(T).name()); })
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, MoveConstructImpl ([](void* A, void* B) { if constexpr (requires(T* A, T* B) { Memory::MoveConstruct (A, B); }) Memory::MoveConstruct (reinterpret_cast<T*>(A), reinterpret_cast< T*>(B)); else checkf(false, TEXT("The type '%s' is not move constructible."), typeid(T).name()); })
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, CopyAssignImpl ([](void* A, const void* B) { if constexpr (requires(T* A, const T* B) { Memory::CopyAssign (A, B); }) Memory::CopyAssign (reinterpret_cast<T*>(A), reinterpret_cast<const T*>(B)); else checkf(false, TEXT("The type '%s' is not copy assignable."), typeid(T).name()); })
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, MoveAssignImpl ([](void* A, void* B) { if constexpr (requires(T* A, T* B) { Memory::MoveAssign (A, B); }) Memory::MoveAssign (reinterpret_cast<T*>(A), reinterpret_cast< T*>(B)); else checkf(false, TEXT("The type '%s' is not move assignable."), typeid(T).name()); })
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, DestroyImpl ([](void* A ) { if constexpr (requires(T* A ) { Memory::Destruct (A ); }) Memory::Destruct (reinterpret_cast<T*>(A) ); else checkf(false, TEXT("The type '%s' is not destructible."), typeid(T).name()); })
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, EqualityCompareImpl ([](const void* A, const void* B) -> bool { if constexpr (CEqualityComparable<T> ) return (*reinterpret_cast<const T*>(A) == *reinterpret_cast<const T*>(B)); else checkf(false, TEXT("The type '%s' is not equality comparable."), typeid(T).name()); return false; })
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, SynthThreeWayCompareImpl ([](const void* A, const void* B) -> partial_ordering { if constexpr (CSynthThreeWayComparable<T>) return NAMESPACE_REDCRAFT::SynthThreeWayCompare (*reinterpret_cast<const T*>(A), *reinterpret_cast<const T*>(B)); else checkf(false, TEXT("The type '%s' is not synth three-way comparable."), typeid(T).name()); return partial_ordering::unordered; })
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, HashImpl ([](const void* A ) -> size_t { if constexpr (CHashable<T> ) return NAMESPACE_REDCRAFT::GetTypeHash (*reinterpret_cast<const T*>(A) ); else checkf(false, TEXT("The type '%s' is not hashable."), typeid(T).name()); return 1080551797; })
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, SwapImpl ([]( void* A, void* B) -> void { if constexpr (CSwappable<T> ) NAMESPACE_REDCRAFT::Swap (*reinterpret_cast< T*>(A), *reinterpret_cast< T*>(B)); else checkf(false, TEXT("The type '%s' is not swappable."), typeid(T).name()); })
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{ }
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};
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constexpr ERepresentation GetRepresentation() const { return static_cast<ERepresentation>(Storage.TypeInfo() & RepresentationMask); }
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constexpr const FTypeInfoImpl& GetTypeInfoImpl() const { return *reinterpret_cast<const FTypeInfoImpl*>(Storage.TypeInfo() & ~RepresentationMask); }
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constexpr void* GetAllocation() { return GetRepresentation() == ERepresentation::Trivial || GetRepresentation() == ERepresentation::Small ? Storage.InlineAllocation() : Storage.HeapAllocation(); }
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constexpr const void* GetAllocation() const { return GetRepresentation() == ERepresentation::Trivial || GetRepresentation() == ERepresentation::Small ? Storage.InlineAllocation() : Storage.HeapAllocation(); }
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template <typename SelectedType, typename... Ts>
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FORCEINLINE void EmplaceImpl(Ts&&... Args)
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{
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static constexpr const FTypeInfoImpl SelectedTypeInfo(InPlaceType<SelectedType>);
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Storage.TypeInfo() = reinterpret_cast<uintptr>(&SelectedTypeInfo);
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constexpr bool bIsInlineStorable = sizeof(SelectedType) <= Storage.InlineSize && alignof(SelectedType) <= Storage.InlineAlignment;
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constexpr bool bIsTriviallyStorable = bIsInlineStorable && CTrivial<SelectedType> && CTriviallyCopyable<SelectedType>;
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if constexpr (bIsTriviallyStorable)
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{
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new(Storage.InlineAllocation()) SelectedType(Forward<Ts>(Args)...);
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Storage.TypeInfo() |= static_cast<uintptr>(ERepresentation::Trivial);
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}
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else if constexpr (bIsInlineStorable)
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{
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new(Storage.InlineAllocation()) SelectedType(Forward<Ts>(Args)...);
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Storage.TypeInfo() |= static_cast<uintptr>(ERepresentation::Small);
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}
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else
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{
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Storage.HeapAllocation() = new SelectedType(Forward<Ts>(Args)...);
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Storage.TypeInfo() |= static_cast<uintptr>(ERepresentation::Big);
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}
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}
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FORCEINLINE void ResetImpl()
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{
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if (!IsValid()) return;
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switch (GetRepresentation())
|
|
{
|
|
case ERepresentation::Trivial:
|
|
break;
|
|
case ERepresentation::Small:
|
|
GetTypeInfoImpl().DestroyImpl(GetAllocation());
|
|
break;
|
|
case ERepresentation::Big:
|
|
GetTypeInfoImpl().DestroyImpl(GetAllocation());
|
|
Memory::Free(Storage.HeapAllocation());
|
|
break;
|
|
default: check_no_entry();
|
|
}
|
|
}
|
|
|
|
friend FORCEINLINE bool operator==(const TAny& LHS, const TAny& RHS)
|
|
{
|
|
if (LHS.GetTypeInfo() != RHS.GetTypeInfo()) return false;
|
|
if (LHS.IsValid() == false) return true;
|
|
return LHS.GetTypeInfoImpl().EqualityCompareImpl(LHS.GetAllocation(), RHS.GetAllocation());
|
|
}
|
|
|
|
friend FORCEINLINE partial_ordering operator<=>(const TAny& LHS, const TAny& RHS)
|
|
{
|
|
if (LHS.GetTypeInfo() != RHS.GetTypeInfo()) return partial_ordering::unordered;
|
|
if (LHS.IsValid() == false) return partial_ordering::equivalent;
|
|
return LHS.GetTypeInfoImpl().SynthThreeWayCompareImpl(LHS.GetAllocation(), RHS.GetAllocation());;
|
|
}
|
|
|
|
};
|
|
|
|
template <typename T, CAnyCustomStorage StorageType>
|
|
constexpr bool operator==(const TAny<StorageType>& LHS, const T& RHS)
|
|
{
|
|
return LHS.template HoldsAlternative<T>() ? LHS.template GetValue<T>() == RHS : false;
|
|
}
|
|
|
|
template <CAnyCustomStorage StorageType>
|
|
constexpr bool operator==(const TAny<StorageType>& LHS, FInvalid)
|
|
{
|
|
return !LHS.IsValid();
|
|
}
|
|
|
|
NAMESPACE_PRIVATE_BEGIN
|
|
|
|
template <typename T> struct TIsTAny : FFalse { };
|
|
template <CAnyCustomStorage StorageType> struct TIsTAny<TAny<StorageType>> : FTrue { };
|
|
|
|
NAMESPACE_PRIVATE_END
|
|
|
|
template <typename T>
|
|
concept CTAny = NAMESPACE_PRIVATE::TIsTAny<T>::Value;
|
|
|
|
using FAny = TAny<>;
|
|
|
|
static_assert(sizeof(FAny) == 64, "The byte size of FAny is unexpected");
|
|
|
|
NAMESPACE_MODULE_END(Utility)
|
|
NAMESPACE_MODULE_END(Redcraft)
|
|
NAMESPACE_REDCRAFT_END
|