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“Abstract class is a class definition that is not fully implemented; one or more class methods remain undefined with the result that no objects can be instantiated from the class.”

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See Java abstract Class

Abstract class in C++ is “a class defining an interface only; used as a base class. Declaring a member function pure virtual makes its class abstract and prevents creation of objects of the abstract class. Use of abstract classes is one of the most effective ways of minimizing the impact of changes in a C++ program and for minimizing compilation time. Example. TC++PL 2.5.4, 12.4.2, D&E 13.2.”

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