Calling the Superclass
Line 30 of Listing 22.6 calls on anExternalInterface's GetOperatorChar() when the tape file has run out of commands. Prefixing the function call with the name of the class where the function is defined followed by the scope resolution operator causes this to occur.
Referring to the Superclass Implementation Is Dangerous
 | One of the most common problems in object-oriented systems where the inheritance tree evolves over time occurs when a new class is inserted into the tree between a derived class and its former superclass. If you were to insert such a class after making your call from the derived class to the superclass directly, ... |
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