---
title: "~(_:)"
framework: swift
role: symbol
role_heading: Operator
path: "swift/uint8/~(_:)"
---

# ~(_:)

Returns the inverse of the bits set in the argument.

## Declaration

```swift
static func ~ (x: Self) -> Self
```

## Discussion

Discussion The bitwise NOT operator (~) is a prefix operator that returns a value in which all the bits of its argument are flipped: Bits that are 1 in the argument are 0 in the result, and bits that are 0 in the argument are 1 in the result. This is equivalent to the inverse of a set. For example: let x: UInt8 = 5        // 0b00000101 let notX = ~x           // 0b11111010 Performing a bitwise NOT operation on 0 returns a value with every bit set to 1. let allOnes = ~UInt8.min   // 0b11111111 note: O(1).