Why does max doesn't work in CGFloat extension in Swift?

Question

Anybody knows what this doesn't work (Static member min cannot be used on instance of Type CGFloat. in the extension.

extension CGFloat {
    mutating func normalize() {
        self = min(max(CGFloat(0), self), CGFloat(1))
   }
}

while this works

let f: CGFloat = CGFloat(0.4)
let maxValue = max(f, 1)

Answer 1

You can get this to work by specifying Swift.min and Swift.max as such:

extension CGFloat {
    mutating func normalize() {
        self = Swift.min( Swift.max(CGFloat(0), self), CGFloat(1))
    }
}

when using just min and max it is unsure if you mean CGFloat.min or Swift.min