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)