Converting signed to unsigned in Swift

Question

In C, I am able to do a trick with numbers:

uint8_t value = 0
int delta = -1
uint8_t result = value + delta  /* result will be 0xFF */

Is

Answer 1

All signed and unsigned integer types have a bitPattern: constructor, which creates an unsigned number from a signed (or vice versa) with the same memory representation:

let delta: Int8 = -1
let result: UInt8 = UInt8(bitPattern: delta) // 0xFF = 255