text: //
  //  WeakReference.h
  //  Kuber
  //
  //  Created by Kuber on 16/4/29.
  //  Copyright © 2016年 Huaxu Technology. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  typedef id (^WeakReference)(void);
  
  WeakReference makeWeakReference(id object);
  
  id weakReferenceNonretainedObjectValue(WeakReference ref);
  