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Answered 2011-05-27 23:32:49

An abstract class is a class that has a pure virtual function.

A pure virtual function can be used in a base class if the function that is virtualised contains parameters that can and should be interchangeable, but the function should remain intact.

For example, there is a base class Object in a game that will contain movement for simple objects, but the movement function may need to use different parameters per object.

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