UBlueprintMapLibrary

class Engine Blueprint Since unknown

Inherits: UObjectBase › UObjectBaseUtility › UObject › UBlueprintFunctionLibrary › UBlueprintMapLibrary

#include "Kismet/BlueprintMapLibrary.h"

Description

Blueprint function library exposing generic map operations (add, remove, find, keys, values, length, and more) that work against any wildcard TMap type. Backs the 'Utilities|Map' 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 TMap<int32, int32> placeholder type — the declared int32 signatures do not reflect the actual key/value types used at a given call site.
• Because these are wildcard/generic nodes, C++ code should generally call TMap's own member functions (Add, Remove, Find) directly rather than going through UBlueprintMapLibrary, which exists primarily to back the Blueprint graph nodes.

Functions (13)

Map 13

Map

13 ▼

Access	Type	Name	Description
public	function	UBlueprintMapLibrary::Map_Add	Adds a key/value pair to a map, overwriting any existing value already stored under that key.
public	function	UBlueprintMapLibrary::Map_Clear	Clears a map of all entries, resetting it to empty.
public	function	UBlueprintMapLibrary::Map_Contains	Checks whether a key is present in a map without retrieving its value.
public	function	UBlueprintMapLibrary::Map_Find	Looks up the value associated with a key in a map, writing it to Value and returning whether the key was found.
public	function	UBlueprintMapLibrary::Map_IsEmpty	Returns true if the map has zero entries.
public	function	UBlueprintMapLibrary::Map_IsNotEmpty	Returns true if the map has at least one entry — the logical inverse of Map_IsEmpty.
public	function	UBlueprintMapLibrary::Map_Keys	Outputs an array containing a copy of every key in the map.
public	function	UBlueprintMapLibrary::Map_Length	Returns the number of key/value pairs currently stored in the map.
public	function	UBlueprintMapLibrary::Map_Remove	Removes the entry for the given key from a map, if present, and reports whether anything was removed.
public	function	UBlueprintMapLibrary::Map_Values	Outputs an array containing a copy of every value in the map, in the same order as the corresponding Map_Keys call.
public	function	UBlueprintMapLibrary::Map_GetKeyValueByIndex	Returns a copy of the key and value stored at a given index, for iterating a map by index instead of by key lookup.
public	function	UBlueprintMapLibrary::Map_GetLastIndex	Returns the highest valid index into the map's internal storage, for use with Map_GetKeyValueByIndex when iterating by index.
public	function	UBlueprintMapLibrary::SetMapPropertyByName	Internal helper that assigns a wildcard map value to a named TMap UPROPERTY on an object, used to back the auto-generated Blueprint setter node for exposed map properties.

Version History

Introduced in: unknown

Version	Status	Notes
5.6	stable	—

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