77 lines
2.0 KiB
C
77 lines
2.0 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 "Memory/AllocatorInterface.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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/** This is heap allocator that calls Memory::Malloc() directly for memory allocation. */
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struct FHeapAllocator : public FAllocatorInterface
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{
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template <CObject T>
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struct ForElementType : public FAllocatorInterface::ForElementType<T>
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{
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NODISCARD FORCEINLINE T* Allocate(size_t InNum)
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{
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return InNum != 0 ? static_cast<T*>(Memory::Malloc(Memory::QuantizeSize(InNum * sizeof(T)), alignof(T))) : nullptr;
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}
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FORCEINLINE void Deallocate(T* InPtr)
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{
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Memory::Free(InPtr);
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}
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NODISCARD FORCEINLINE constexpr size_t CalculateSlackGrow(size_t Num, size_t NumAllocated) const
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{
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const size_t FirstGrow = 4;
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const size_t ConstantGrow = 16;
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size_t Result;
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check(Num > NumAllocated);
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Result = (NumAllocated != 0) ? (Num + 3 * Num / 8 + ConstantGrow) : (Num > FirstGrow ? Num : FirstGrow);
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Result = Memory::QuantizeSize(Result * sizeof(T), alignof(T)) / sizeof(T);
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return Result;
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}
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NODISCARD FORCEINLINE constexpr size_t CalculateSlackShrink(size_t Num, size_t NumAllocated) const
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{
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size_t Result;
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check(Num < NumAllocated);
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const bool bTooManySlackBytes = (NumAllocated - Num) * sizeof(T) >= 16 * 1024;
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const bool bTooManySlackElements = 3 * Num < 2 * NumAllocated;
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const bool bNeedToShrink = (bTooManySlackBytes || bTooManySlackElements) && (NumAllocated - Num > 64 || Num == 0);
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if (bNeedToShrink)
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{
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Result = Num != 0 ? Memory::QuantizeSize(Num * sizeof(T), alignof(T)) / sizeof(T) : 0;
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}
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else
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{
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Result = NumAllocated;
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}
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return Result;
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}
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NODISCARD FORCEINLINE constexpr size_t CalculateSlackReserve(size_t Num) const
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{
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return Num != 0 ? Memory::QuantizeSize(Num * sizeof(T), alignof(T)) / sizeof(T) : 0;
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}
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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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