是否可以在 Swift 中访问隐藏的顶级函数? [英] Is it possible to access a shadowed top level function in Swift?

问题描述

我试图编写一个 Int 扩展来将 Int 限制在特定范围内，如下所示:

I was trying to write an Int extension to clamp an Int to a specific range, like this:

extension Int {
  func clamp(left: Int, right: Int) -> Int {
    return min(max(self, left), right)
  }
}

我收到一个编译器错误，过了一会儿我意识到min在这里被解释为Int.min，这是最低的常数Int.

I was getting a compiler error and after a while I realised that min is being interpreted here as Int.min, which is a constant for the lowest Int.

我可以重新实现这个避免 min/max 但我很好奇:有没有办法可以从 Int 扩展中引用它们?

I can reimplement this avoiding min/max but I'm curious: is there a way I can reference those from an Int extension?

推荐答案

你可以在前面加上模块名称，在这种情况下 Swift:

You can prepend the module name, in this case Swift:

extension Int {
    func clamp(left: Int, right: Int) -> Int {
        return Swift.min(Swift.max(self, left), right)
    }
}

只是为了好玩:你得到相同的结果

And just for fun: You get the same result with

extension Int {
    func clamp(left: Int, right: Int) -> Int {
        return (left ... right).clamp(self ... self).start
    }
}

使用 ClosedInterval 中的 clamp() 方法.

using the clamp() method from ClosedInterval.

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