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Upcasting and Downcasting

Vijay Kumar
24/05/2017 0 0

Converting a derived-class reference or pointer to a base-class reference or pointer is called upcasting. It is always allowed for public inheritance without the need for an explicit type cast.

The downcasting, the opposite of upcasting, is a process converting a base-class pointer or reference to a derived-class pointer or reference.

It is not allowed without an explicit type cast. That's because a derived class could add new data members, and the class member functions that used these data members wouldn't apply to the base class.

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