ClassCluster.swift

/* ClassCluster Example */
/* Documentation: https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaEncyclopedia/ClassClusters/ClassClusters.html#//apple_ref/doc/uid/TP40010810-CH4 */
/* This example explicated in Objc: http://stackoverflow.com/questions/1844158/what-exactly-is-a-so-called-class-cluster-in-objective-c */

enum Types {
    case Guffaw
    case Giggle
}

protocol ClassClusterExample {
    func ftw() -> String
}

class Laugh : ClassClusterExample {
    func initWithType(type : Types) -> ClassClusterExample {
        var c : ClassClusterExample!
       
        switch type {
        case .Guffaw:
            c = Guffaw()
        case .Giggle:
            c = Giggle()
        }
        
        return c
    }
    func ftw() -> String {
        return "Laugh"
    }
}
class Guffaw : Laugh{
    override func ftw() -> String {
        return "Guffaw"
    }
}
class Giggle : Laugh {
    override func ftw() -> String {
        return "Giggle"
    }
}

var guffaw = Laugh().initWithType(.Guffaw)
guffaw.ftw()