Swift Singleton

singleton.swift

class mySingletonClass
{
    class var default: mySingletonClass
    {
        struct Static
        {
            static var instance: mySingletonClass?
            static var token: dispatch_once_t = 0
        }
        dispatch_once(&Static.token) {
            Static.instance = mySingletonClass()
        }
        return Static.instance!
    }
}