In above code, base class pointer ‘bptr’ contains the address of object ‘d’ of derived class. Also, a base class pointer can point to the objects of base class as well as to the objects of derived class.

A class may have virtual destructor but it cannot have a virtual constructor.Ĭompile-time(early binding) VS run-time(late binding) behavior of Virtual FunctionsĬonsider the following simple program showing run-time behavior of virtual functions.Įxplanation: Runtime polymorphism is achieved only through a pointer (or reference) of base class type.

It is not mandatory for the derived class to override (or re-define the virtual function), in that case, the base class version of the function is used.

They are always defined in the base class and overridden in a derived class.

The prototype of virtual functions should be the same in the base as well as derived class.

Virtual functions should be accessed using pointer or reference of base class type to achieve run time polymorphism.

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