Returns the result of shifting a value’s binary representation the specified number of digits to the left, masking the shift amount to the type’s bit width, and stores the result in the left-hand-side variable.
The value to shift.
The number of bits to shift
lhsto the left. If
rhsis outside the range
0..<lhs.bitWidth, it is masked to produce a value within that range.
&<<= operator performs a masking shift, where the value used as
rhs is masked to produce a value in the range
0..<lhs.bitWidth. The shift is performed using this masked value.
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 shift amount requires no masking.
var x: UInt8 = 30 // 0b00011110 x &<<= 2 // x == 120 // 0b01111000
However, if you pass
rhs, the method first bitmasks
3, and then uses that masked value as the number of bits to shift
var y: UInt8 = 30 // 0b00011110 y &<<= 19 // y == 240 // 0b11110000