C++ Programming - OOPS Concepts - Discussion

Can we declare virtual class?

Yes, we can declare class as a virtual. It removes ambiguity of same function name used in different classes.

Example - hybrid inheritance.

I think we cannot create virtual constructor as well as virtual destructor.

You are thinking well. But, we can create virtual destructor.

Hi, it was helpful thanks to all.

There is no such a thing as a "virtual class", but only the expression "virtual base class" that is just an euphemism that has sense only in the context of inheritance, meaning the base class involved in virtual inheritance, here the word "virtual" is actually an attribute of the inheritance not of the class. Is like "C++ slang", but altering the expression and it's context and making it official by saying it's a correct answer is weird, to say the least.

Constructors can be virtual and static. So right answer is destructor D option.

The virtual not work with destructor.

Constructor cannot be virtual because the time when constructor is called, there is no virtual table in the memory yet. But destructor can be virtual.

The "virtual" keyword is used to prevent early binding which checks which function is called at runtime, known as "late binding".

But the constructor is called at runtime, that's why no late binding problem occurs with the constructor. That is the actual reason virtual keyword is not used or can't be used before the constructor.