BulkDataBuffer.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
template<typename DataType>
class FBulkDataBuffer
{
public:
    using ViewType = TArrayView64<DataType>;
 
    FBulkDataBuffer() = default;
 
    FBulkDataBuffer(const FBulkDataBuffer& Other)
    {
        *this = Other;
    }
 
    FBulkDataBuffer(FBulkDataBuffer&& Other)
    {
        View = Other.View;
        Other.View = ViewType();
    }
 
    FBulkDataBuffer(DataType* InBuffer, int64 InNumberOfElements)
        : View(InBuffer, InNumberOfElements)
    {
 
    }
 
    ~FBulkDataBuffer()
    {
        FreeBuffer();
    }
 
    FBulkDataBuffer& operator =(const FBulkDataBuffer& Other)
    {
        FreeBuffer();
 
        if (this != &Other)
        {
            const int64 BufferSize = Other.View.Num();
 
            DataType* BufferCopy = (DataType*)FMemory::Malloc(BufferSize);
            FMemory::Memcpy(BufferCopy, Other.View.GetData(), BufferSize);
 
            View = ViewType(BufferCopy, BufferSize);
        }
 
        return *this;
    }
 
    FBulkDataBuffer& operator =(FBulkDataBuffer&& Other)
    {
        if (this != &Other)
        {
            FreeBuffer();
 
            View = Other.View;
            Other.View = ViewType();
        }
 
        return *this;
    }
 
    void Empty()
    {
        FreeBuffer();
 
        View = ViewType();
    }
 
    void Reset(DataType* InBuffer, uint64 InNumberOfElements)
    {
        FreeBuffer();
 
        View = ViewType(InBuffer, InNumberOfElements);
    }
 
    const ViewType& GetView() const 
    { 
        return View; 
    }
 
private:
 
    void FreeBuffer()
    {
        if (View.GetData() != nullptr)
        {
            FMemory::Free(View.GetData());
        }
    }
 
    ViewType View;
};