• 1. Delegate To Object: 授人以物

• 1.The constructor is used to form a delegate over a target object and a function pointer.
  这构造器用来通过一个目标对象和一个函数指针形成一个委托。
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• 2.The delegating object keeps a reference to the other object, the delegate, and at the appropriate time sends a message to it.
  委托对象保持对另一个对象的引用，委托方法在恰当的时间向其发送消息。
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• 3.This delegate simply returns the newly instantiated object and leaves the construction logic up to the client supplying the delegate.
  该委托只是返回刚刚实例化的对象，而将构建逻辑留待提供该委托的客户端完成。
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