import Foundation
public func sine <T: FloatingPoint > (_ x: T ) -> T{
return sin(x)
}
// Error: Cannot invoke 'sin' with an argument list of type '(T)'
有没有解决的办法?
非常感谢。
您还可以创建一个接受 FloatingPoint 类型的 sin 方法,如下所示:
import UIKit
func sin<T: FloatingPoint>(_ x: T) -> T {
switch x {
case let x as Double:
return sin(x) as? T ?? 0
case let x as CGFloat:
return sin(x) as? T ?? 0
case let x as Float:
return sin(x) as? T ?? 0
default:
return 0 as T
}
}
另一种选择是向 FloatingPoint 类型添加方法或计算属性扩展,如下所示:
extension FloatingPoint {
var sin: Self {
switch self {
case let x as Double:
return UIKit.sin(x) as? Self ?? 0
case let x as CGFloat:
return UIKit.sin(x) as? Self ?? 0
case let x as Float:
return UIKit.sin(x) as? Self ?? 0
default:
return 0 as Self
}
}
}
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