International Callback
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About International Callback
An object of class CallBack stores a reference to an object and the name of a method implemented by that object. When the CallBack object is sent the "invoke" message, it executes the named method in the object it has stored. One use of CallBack objects is to handle GUI event processing. For example, the Phonebook GUIController has an Add method for adding new records. A CallBack to this method in GUIController is attached to the pushbutton object for Add, and whenever the pushbutton is clicked it invokes this CallBack.
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