泛型

import Foundation

func swapValue<T>(inout a:T,inout b:T){

    let temp = a

    a = b

    b = temp

}

var a="hello"

var b="thanks"

swapValue(&a, &b)

var c=12

var d=34

swapValue(&c, &d)

class Sunday<T>{

    func getName(s:T){

        println(s)

    }

    

}

var vSunday = Sunday<String>()

vSunday.getName("hello")