UKismetMathLibrary::BooleanNAND
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticBlueprintPure
Description
Returns false only when both A and B are true; returns true in all other cases (logical NOT AND). Use when you need to allow an action unless two conditions are simultaneously true.
Caveats & Gotchas
- • NAND is equivalent to NOT (A AND B), not to (NOT A) AND (NOT B) — a common point of confusion. Only the case where both inputs are true produces false.
- • Like BooleanAND, this node does not short-circuit in Blueprint graphs — both inputs are always evaluated.
Signature
static UE_INL_API bool BooleanNAND(bool A, bool B);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| A | bool | First boolean operand. | — |
| B | bool | Second boolean operand. | — |
Return Type
bool Example
Allow movement unless both brakes and reverse are engaged C++
bool bCanMove = UKismetMathLibrary::BooleanNAND(bBrakeEngaged, bReverseEngaged);Tags
Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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