59 lines
2.3 KiB
C
59 lines
2.3 KiB
C
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#pragma once
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#include "CoreTypes.h"
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#include "Memory/Memory.h"
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#include "Templates/Noncopyable.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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struct FAllocatorInterface;
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template <typename T>
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concept CInstantiableAllocator = CDerivedFrom<T, FAllocatorInterface> && !CSameAs<T, FAllocatorInterface>;
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/**
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* This is the allocator interface, the allocator does not use virtual, this contains the default of
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* the allocator interface functions. Unlike std::allocator, IAllocator should be bound to only a object,
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* such as a container, because there may be side effects between multiple allocations, for example,
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* inline storage cannot be allocated multiple times in TInlineAllocator.
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*/
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struct FAllocatorInterface
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{
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template <CObject T>
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struct ForElementType : private FSingleton
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{
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/**
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* Allocates uninitialized storage.
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* Should be allocated according to the results given by the CalculateSlackReserve() family,
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* without needing to allocate memory of the same size as the allocated memory,
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* this is to support special allocators such as TInlineAllocator.
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* If 'InNum' is zero, return nullptr.
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*/
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NODISCARD FORCEINLINE T* Allocate(size_t InNum) = delete;
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/** Deallocates storage. */
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FORCEINLINE void Deallocate(T* InPtr) = delete;
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/** @return true if allocation can be deallocated by another allocator, otherwise false. */
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NODISCARD FORCEINLINE bool IsTransferable(T* InPtr) { return true; }
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/** Calculates the amount of slack to allocate for an array that has just grown to a given number of elements. */
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NODISCARD FORCEINLINE constexpr size_t CalculateSlackGrow(size_t Num, size_t NumAllocated) const = delete;
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/** Calculates the amount of slack to allocate for an array that has just shrunk to a given number of elements. */
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NODISCARD FORCEINLINE constexpr size_t CalculateSlackShrink(size_t Num, size_t NumAllocated) const = delete;
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/** Calculates the amount of slack to allocate for an array that has just grown or shrunk to a given number of elements. */
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NODISCARD FORCEINLINE constexpr size_t CalculateSlackReserve(size_t Num) const = delete;
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};
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};
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NAMESPACE_MODULE_END(Utility)
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NAMESPACE_MODULE_END(Redcraft)
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NAMESPACE_REDCRAFT_END
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