在 Swift 中将有符号转换为无符号 [英] Converting signed to unsigned in Swift
本文介绍了在 Swift 中将有符号转换为无符号的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在 C 中,我可以用数字来做一个技巧:
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 */
有没有办法在 Swift 中做同样的事情?请注意,相同的方法不起作用:
Is there a way of doing the same in Swift? Notice that the same approach doesn't work:
let value: UInt8 = 0
let delta: Int = -1
var result: UInt8 = value + delta // Error, even typecasting in different ways...
有没有办法在 Swift 中获得 C 的减法行为?
Is there a way to get C's behaviour for substraction in Swift?
谢谢!
推荐答案
所有有符号和无符号整数类型都有一个 bitPattern:
构造函数,它从具有相同符号的(或反之亦然)创建一个无符号数内存表示:
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
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