swift copy

copy.swift

import Cocoa



class Human:NSCopying
{
    var name = ".."
    var spouse:Human?
    
    func copy() -> AnyObject! {
        if let asCopying = ((self as AnyObject) as? NSCopying) {
            return asCopying.copyWithZone(nil)
        }
        else {
            assert(false, "This class doesn't implement NSCopying")
            return nil
        }
    }
    
    func copyWithZone(zone: NSZone) -> AnyObject! {
        
        
        let newValue = Human()
        newValue.name = name
        newValue.spouse = spouse
        
        
        return newValue
    }
}



var h1 = Human()
h1.name



var h2 = h1.copy() as Human