Friend methods in C++ is not working

Question

I wrote the following code:

class Osoba{
private:
    string imie, nazwisko, kolorOczu;
    friend void Dziecko::coutall();
public:
    Osoba(string imie, string         


        

Answer 1

You cannot do it, because Dziecko::coutall is not defined when Osoba is compiled and there are no means in c++ to make forward member method declaration. Instead you can make friend all Dziecko class (as Nbr44 suggested)

Answer 2

It seems you can't call that method because it uses private members of class Osoba.

Try using the imie as a protected variable instead of private.

Here is a short explenation.

The 2 options available are:

1) friend the entire class, not a good practice when using inheritance.

2) Use protected members. this is the best way to access private members on inheritance.