UKismetMathLibrary::Not_Int64

function Engine Blueprint Since unknown

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns the bitwise NOT of A (~A), flipping every bit in the 64-bit representation. Used to produce complement masks for bitwise AND operations.

Caveats & Gotchas

• Bitwise NOT of a non-negative value always produces a negative result because bit 63 (the sign bit) gets flipped. If you need the result treated as an unsigned mask, cast to uint64 in C++ before using it.
• ~0 in int64 is -1, not 0 — a common mistake when trying to clear a full flags field. Assign 0 directly rather than using Not_Int64(0) if you want to zero out all bits.

Signature

static UE_INL_API int64 Not_Int64(int64 A);

Parameters

Name	Type	Description	Default
A	int64	Value to bitwise-invert.	—

Return Type

int64

Example

Clear a specific bit using NOT and AND C++

const int64 DebugFlag = (1LL << 10);
int64 Flags = GetFlags();
Flags = UKismetMathLibrary::And_Int64Int64(Flags, UKismetMathLibrary::Not_Int64(DebugFlag));

Version History

Introduced in: unknown

Version	Status	Notes
5.6	stable	—

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