Can anyone justify the statement: A virtual function can be declared as a friend of another class.

Question

Virtual and Friend function, cpp

Answer 1

It does not make sense at all. Friend function is function that is not declared as method and have access to protected/private members of a class.
Virtual functions can only be member functions (aka methods). You can't have virtual non-member function.

Quotation:
"friend functions in C++ can not be declared virtual and therefore no dynamic binding of friend functions is possible."