UBlueprintSetLibrary

class Engine Blueprint Since unknown

Inherits: UObjectBase › UObjectBaseUtility › UObject › UBlueprintFunctionLibrary › UBlueprintSetLibrary

#include "Kismet/BlueprintSetLibrary.h"

Description

Blueprint function library exposing generic set operations (add, remove, contains, union, intersection, and more) that work against any wildcard TSet type. Backs the 'Utilities|Set' category nodes in the Blueprint graph editor.

Caveats & Gotchas

• The class carries BlueprintThreadSafe at the UCLASS level, but individual functions are implemented via CustomThunk against a wildcard TSet<int32> placeholder type — the declared int32 signatures do not reflect the actual element type used at a given call site.
• Because these are wildcard/generic nodes, C++ code should generally call TSet's own member functions (Add, Remove, Contains) directly rather than going through UBlueprintSetLibrary, which exists primarily to back the Blueprint graph nodes.

Functions (16)

Set 16

Set

16 ▼

Access	Type	Name	Description
public	function	UBlueprintSetLibrary::Set_Add	Adds an item to a set.
public	function	UBlueprintSetLibrary::Set_Clear	Clears a set of all elements, resetting it to empty.
public	function	UBlueprintSetLibrary::Set_Contains	Returns true if the set contains an item that compares equal to ItemToFind.
public	function	UBlueprintSetLibrary::Set_IsEmpty	Returns true if the set has zero elements.
public	function	UBlueprintSetLibrary::Set_IsNotEmpty	Returns true if the set has at least one element — the logical inverse of Set_IsEmpty.
public	function	UBlueprintSetLibrary::Set_Length	Returns the number of items currently stored in the set.
public	function	UBlueprintSetLibrary::Set_Remove	Removes an item from a set, returning whether an equal item was actually found and removed.
public	function	UBlueprintSetLibrary::Set_AddItems	Adds every element of an array to a set in one call, skipping any that are already present.
public	function	UBlueprintSetLibrary::Set_Difference	Assigns Result to the relative difference of Set A and Set B — every element in A that is not also found in B.
public	function	UBlueprintSetLibrary::Set_GetItemByIndex	Returns a copy of the set element stored at Index, for manually iterating a set by index.
public	function	UBlueprintSetLibrary::Set_GetLastIndex	Returns the highest valid index into the set — Set_Length minus one — for use with Set_GetItemByIndex.
public	function	UBlueprintSetLibrary::Set_Intersection	Assigns Result to the intersection of Set A and Set B — every element present in both sets.
public	function	UBlueprintSetLibrary::Set_RemoveItems	Removes every element of an array from a set in one call.
public	function	UBlueprintSetLibrary::Set_ToArray	Copies the contents of a set into an array, useful whenever you need index-based access or a fixed iteration order.
public	function	UBlueprintSetLibrary::Set_Union	Assigns Result to the union of Set A and Set B — every element in A plus every element in B, with duplicates collapsed since a set only stores unique values.
public	function	UBlueprintSetLibrary::SetSetPropertyByName	Internal helper that assigns a TSet-typed UPROPERTY on Object to Value, looked up by property name.

Version History

Introduced in: unknown

Version	Status	Notes
5.6	stable	—

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