FRefCountVector | Unreal Engine 5.5 Documentation

API > API/Runtime > API/Runtime/GeometryCore > API/Runtime/GeometryCore/Util

Warnings refcounts are 16-bit ints (shorts) so the maximum count is 65536. behavior is undefined if this overflows. No overflow checking is done in release builds.

References


Module	GeometryCore
Header	/Engine/Source/Runtime/GeometryCore/Public/Util/RefCountVector.h
Include	#include "Util/RefCountVector.h"

Syntax

class FRefCountVector

Remarks

FRefCountVector is used to keep track of which indices in a linear Index list are in use/referenced. A free list is tracked so that unreferenced indices can be re-used.

The enumerator iterates over valid indices (ie where refcount > 0)

refcounts are 16-bit ints (shorts) so the maximum count is 65536. behavior is undefined if this overflows.

No overflow checking is done in release builds.

Constructors

	Type	Name	Description
		FRefCountVector ()
		FRefCountVector ( const FRefCountVector& )
		FRefCountVector ( FRefCountVector&& )

Functions

Type	Name	Description
int	Allocate ()
bool	AllocateAt ( int Index )	Allocate at specific Index, which must either be larger than current max Index, or on the free list.
bool	AllocateAtUnsafe ( int Index )	Allocate at specific Index, which must be free or larger than current max Index.
IndexIterator	BeginIndices ()
void	Clear ()
void	Decrement ( int Index, unsigned short DecrementCount )
IndexIterator	EndIndices ()
FilteredEnumerable	FilteredIndices ( TFunction< bool(int)> FilterFunc )
size_t	GetCount ()
size_t	GetMaxIndex ()
int	GetRawRefCount ( int Index )
const TDynamicVector< unsigned short > &	GetRawRefCounts ()
TDynamicVector< unsigned short > &	GetRawRefCountsUnsafe ()	You should not use this!
int	GetRefCount ( int Index )
int	Increment ( int Index, unsigned short IncrementCount )
IndexEnumerable	Indices ()	Returns iteration object over valid indices usage: for (int idx : indices()) { ... }
bool	IsDense ()
bool	IsEmpty ()
bool	IsValid ( int Index )
bool	IsValidUnsafe ( int Index )
MappedEnumerable< ToType >	MappedIndices ( TFunction< ToType(int)> MapFunc )	Returns iteration object over mapping applied to valid indices eg usage: for (FVector3d v : mapped_indices(fn_that_looks_up_mesh_vtx_from_id)) { ... }
void	Rebuild ( unsigned int Num, IterateFunc&& Iterate, AllocateRefCountFunc&& AllocateRefCount, IncrementRefCountFunc&& IncrementRefCount )	Todo: remove clear Rebuilds all reference counts from external source data via callables.
void	RebuildFreeList ()
void	Serialize ( FArchive& Ar, bool bCompactData, bool bUseCompression )	Serialize FRefCountVector to an archive.
void	SetRefCountUnsafe ( int Index, unsigned short ToCount )	You should not use this!
void	Trim ( int maxIndex )
FString	UsageStats ()

Operators

	Type	Name	Description
	FRefCountVector &	operator= ( const FRefCountVector& )
	FRefCountVector &	operator= ( FRefCountVector&& )

Classes

	Type	Name	Description
	BaseIterator	Iterators base iterator for indices with valid refcount (skips zero-refcount indices)
	FilteredEnumerable	Iteration object that maps indices output by Index_iteration to a second type
	IndexEnumerable	Enumerable object that provides begin()/end() semantics, so you can iterate over valid indices using range-based for loop
	IndexIterator	Iterator over valid indices (ie non-zero refcount)
	MappedEnumerable	Enumerable object that maps indices output by Index_iteration to a second type

Constants

Name	Description
INVALID_REF_COUNT

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