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A method is simply a name we often use when referring to a virtual function in object oriented programming. We can define virtual functions for any class method which we expect to be overridden by a derivative of the class. Even if the exact runtime type of an object is not known but we hold a reference or pointer to one of its base classes, and unless we specify otherwise, implicitly invoking any method of that base class will invoke the most-derived override of that method, thus objects behave according to type even when that type is not known at compile time. This is known as runtime polymorphism.

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