memsafe.swift

//
//  main.swift
//  memsafe
//
//  Created by Chad Austin on 8/10/16.
//  Copyright © 2016 Chad Austin. All rights reserved.
//

import Foundation

let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
let queue = dispatch_get_global_queue(priority, 0)

class Bird {
    init(n: Int) {
        self.n = n
    }
    private let n: Int
}

enum Variant {
    case V1(Bird)
    case V2(Double)
}

var single = Variant.V2(5)

dispatch_async(queue) {
    while true {
        switch single {
        case .V1(let b):
            print(b.n)
        case .V2(let n):
            print(n)
        }
    }
}
while true {
    if drand48() < 0.5 {
        single = .V1(Bird(n: 15))
    } else {
        single = .V2(1.0 / 3.0)
    }
}