1. 1.1.3
Type Operator

# >>=(_:_:)

Stores the result of shifting a value’s binary representation the specified number of digits to the right in the left-hand-side variable.

• Available because `Self` conforms to `FixedWidthInteger`.

``static func >>= <Other>(lhs: inout Self, rhs: Other) where Other : BinaryInteger``

## Parameters

lhs

The value to shift.

rhs

The number of bits to shift `lhs` to the right.

## Overview

The `>>=` operator performs a smart shift, which defines a result for a shift of any value.

• Using a negative value for `rhs` performs a left shift using `abs(rhs)`.

• Using a value for `rhs` that is greater than or equal to the bit width of `lhs` is an overshift. An overshift results in `-1` for a negative value of `lhs` or `0` for a nonnegative value.

• Using any other value for `rhs` performs a right shift on `lhs` by that amount.

The following example defines `x` as an instance of `UInt8`, an 8-bit, unsigned integer type. If you use `2` as the right-hand-side value in an operation on `x`, the value is shifted right by two bits.

``````var x: UInt8 = 30                 // 0b00011110
x >>= 2
// x == 7                         // 0b00000111``````

If you use `11` as `rhs`, `x` is overshifted such that all of its bits are set to zero.

``````var y: UInt8 = 30                 // 0b00011110
y >>= 11
// y == 0                         // 0b00000000``````

Using a negative value as `rhs` is the same as performing a left shift using `abs(rhs)`.

``````var a: UInt8 = 30                 // 0b00011110
a >>= -3
// a == 240                       // 0b11110000

var b: UInt8 = 30                 // 0b00011110
b <<= 3
// b == 240                       // 0b11110000``````

Right shift operations on negative values “fill in” the high bits with ones instead of zeros.

``````var q: Int8 = -30                 // 0b11100010
q >>= 2
// q == -8                        // 0b11111000

var r: Int8 = -30                 // 0b11100010
r >>= 11
// r == -1                        // 0b11111111``````