     }
     
     private var _finished: Bool = false;
-    override var finished: Bool {
+    override public var finished: Bool {
         get {
             return _finished
         }

///   necessary and then ensuring that `completeOperation()` is called; or
///   override `cancel` method, calling `super.cancel()` and then cleaning-up
///   and ensuring `completeOperation()` is called.
class ConcurrentOperation: NSOperation {
   
    override var asynchronous: Bool {
        return true
    }
    
    private var _executing: Bool = false
    override var executing: Bool {
        get {
            return _executing
        }

        self.finished  = true
    }
    
    override public func start() {
        if self.cancelled {
            self.finished = true
            return
