Return type of an overriding virtual member function

Return type of an overriding virtual member function

Once declared virtual, a member function can be overridden in any level of derivation, as long as the overriding version has the identical signature of the original declaration. This is quite straightforward, but sometimes a virtual has to return an object of type that differs from the return type declared in its base class. The C++ Standard allows that only when the return type is replaced with a class publicly derived from the original return type. For example:

 class B {	virtual B* clone () const { return new B; }}class D {	void* clone () const { return new B; } //error; return type
D* clone () const { return new D; } //OK, D is publicly
//derived from B
Share the Post:
data observability

Data Observability Explained

Data is the lifeblood of any successful business, as it is the driving force behind critical decision-making, insight generation, and strategic development. However, due to its intricate nature, ensuring the

Heading photo, Metadata.

What is Metadata?

What is metadata? Well, It’s an odd concept to wrap your head around. Metadata is essentially the secondary layer of data that tracks details about the “regular” data. The regular