# &-(_:_:)

Returns the difference of the two given values, wrapping the result in case of any overflow.

Available because

`Self`

conforms to`FixedWidthInteger`

.

`static func &- (lhs: Self, rhs: Self) -> Self`

## Parameters

- lhs
A numeric value.

- rhs
The value to subtract from

`lhs`

.

## Overview

The overflow subtraction operator (`&-`

) discards any bits that overflow the fixed width of the integer type. In the following example, the difference of `10`

and `21`

is less than zero, the minimum representable `UInt`

value, so the result is the partial value after discarding the overflowing bits.

```
let x: UInt8 = 21 &- 10
// x == 11
let y: UInt8 = 10 &- 21
// y == 245 (after overflow)
```

For more about arithmetic with overflow operators, see Overflow Operators in *The Swift Programming Language*.