FCompositeBuffer | Unreal Engine 4.27 Documentation

Unreal Engine C++ API Reference > Runtime > Core > Memory

References


Module	Core
Header	/Engine/Source/Runtime/Core/Public/Memory/CompositeBuffer.h
Include	#include "Memory/CompositeBuffer.h"

Syntax

class FCompositeBuffer

Remarks

FCompositeBuffer is a non-contiguous buffer composed of zero or more immutable shared buffers.

A composite buffer is most efficient when its segments are consumed as they are, but it can be flattened into a contiguous buffer when necessary, by calling ToShared(). Ownership of segment buffers is not changed on construction, but if ownership of segments is required then that can be guaranteed by calling MakeOwned().

Constructors

	Type	Name	Description
		FCompositeBuffer ( BufferTypes&&... Buffers )	Construct a composite buffer by concatenating the buffers.

Functions

Type	Name	Description
void	CopyTo ( FMutableMemoryView Target, uint64 Offset )	Copies a range of the buffer to a contiguous region of memory.
bool	EqualBytes ( const FCompositeBuffer& Other )	Returns true if the bytes of this buffer are equal to the bytes of the other buffer.
TConstArrayView< FSharedBuffer >	GetSegments ()	Returns the segments that the buffer is composed from.
uint64	GetSize ()	Returns the total size of the composite buffer in bytes.
bool	IsNull ()	Returns true if the composite buffer is null.
bool	IsOwned ()	Returns true if every segment in the composite buffer is owned.
void	IterateRange ( uint64 Offset, uint64 Size, TFunctionRef< void(FMemoryViewView)> Visitor )	Invokes a visitor with a view of each segment that intersects with a range.
void	IterateRange ( uint64 Offset, uint64 Size, TFunctionRef< void(FMemoryViewView, const FSharedBuffer&ViewOuter)> Visitor )
FCompositeBuffer	MakeOwned ()
FCompositeBuffer	MakeOwned ()	Returns a copy of the buffer where every segment is owned.
FCompositeBuffer	Mid ( uint64 Offset, uint64 Size )	Returns the middle part of the buffer by taking the size starting at the offset.
void	Reset ()	Reset this to null.
FSharedBuffer	ToShared ()	Returns the concatenation of the segments into a contiguous buffer.
FSharedBuffer	ToShared ()
FMemoryView	ViewOrCopyRange ( uint64 Offset, uint64 Size, FUniqueBuffer& CopyBuffer )	Returns a view of the range if contained by one segment, otherwise a view of a copy of the range.
FMemoryView	ViewOrCopyRange ( uint64 Offset, uint64 Size, FUniqueBuffer& CopyBuffer, TFunctionRef< FUniqueBuffer(uint64Size)> Allocator )