-=(_:_:)
Subtracts the second value from the first and stores the difference in the left-hand-side variable.
Declaration
override static func -= (lhs: inout Self, rhs: Self)Parameters
- lhs:
A numeric value.
- rhs:
The value to subtract from
lhs.
Discussion
The difference of the two arguments must be representable in the arguments’ type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value:
var x: UInt8 = 21
x -= 50
// Overflow error