UKismetMathLibrary::BooleanXOR

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Returns true only when exactly one of A or B is true (exclusive OR). Use to detect when two states differ, such as toggling or detecting state transitions.

Caveats & Gotchas

• XOR is equivalent to NotEqual_BoolBool for booleans — both produce identical results. Prefer whichever name better communicates intent in the surrounding code.
• Unlike AND and OR, XOR does not carry the CommutativeAssociativeBinaryOperator meta, so Blueprint will not auto-merge chained XOR nodes into a multi-input node.

Signature

static UE_INL_API bool BooleanXOR(bool A, bool B);

Parameters

Name	Type	Description	Default
A	bool	First boolean operand.	—
B	bool	Second boolean operand.	—

Return Type

bool

Example

Detect when exactly one player is ready C++

bool bOneReady = UKismetMathLibrary::BooleanXOR(bPlayer1Ready, bPlayer2Ready);
if (bOneReady)
{
    ShowWaitingForOtherPlayerMessage();
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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