Question

explain any 8 characteristics of virtual function std 12th

Answer 1

In C++, a virtual function is a member function of a class that is declared as virtual in its base class and is overridden in its derived classes. Here are eight characteristics of virtual functions:

1. Virtual functions allow for dynamic binding: When a virtual function is called through a pointer or reference to a base class, the correct function implementation is determined at runtime based on the type of the object it points to.

2. A virtual function is declared in a base class and can be overridden in any derived class.

3. Virtual functions are implemented using a virtual function table or vtable that contains pointers to the derived class implementations of the virtual function.

4. A class with at least one virtual function is considered a polymorphic class.

5. Non-virtual functions are resolved at compile-time, whereas virtual functions are resolved at runtime.

6. Virtual functions are usually declared in the public section of a class.

7. Virtual functions can have a default implementation in the base class.

8. Virtual destructors are necessary when dealing with polymorphic classes to ensure proper destruction of derived class objects.