Rules of Virtual Function in C++

  • Virtual functions must be members of some class.
  • Virtual functions cannot be static members.
  • They are accessed through object pointers.
  • They can be a friend of another class.
  • A virtual function must be defined in the base class, even though it is not used.
  • The prototypes of a virtual function of the base class and all the derived classes must be identical. If the two functions with the same name but different prototypes, C++ will consider them as the overloaded functions.
  • We cannot have a virtual constructor, but we can have a virtual destructor
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