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void sharedDataChangedCallback(CFNotificationCenterRef postingCenter,
                               void * observer,
                               CFStringRef name,
                               void const * object,
                               CFDictionaryRef userInfo)
{
    // Springboard from Darwin notification center to NSNotificationCenter.
    // Note that most of the received arguments are NULL with the Darwin notification center.
    [[NSNotificationCenter defaultCenter] postNotificationName:kDemoNotesSaveByAppNotification object:[DemoNoteManager sharedManager]];
}

func sharedDataChangedCallback(center: CFNotificationCenterRef,
                             observer: AnyObject,
                                 name: CFString,
                               object: AnyObject,
                             userInfo: CFDictionaryRef)
{   NSNotificationCenter.defaultCenter().postNotificationName(kDemoNotesSaveByAppNotification , object: CoreDataStore.sharedInstance)
}

CFNotificationCenterAddObserver(center, nil, sharedDataChangedCallback, self.observingSaveNotificationName() as CFString!, nil, CFNotificationSuspensionBehavior.DeliverImmediately)

-(void) deinit {
    DemoNoteManager *sharedManager = [DemoNoteManager sharedManager];
    [sharedManager stopObservingChangeNotifications];
}