Cannot call member function std::string Sportist::getIme() without object

Question

I have a class A:

class Sportist{
    private:
        string ime;
        int godina_na_ragjanje;
        int godisna_zarabotuvacka_EUR;
    public:
        Sportist(string i, int g_n_r, int g_z_EUR){
            ime = i;
            godina_na_ragjanje = g_n_r;
            godisna_zarabotuvacka_EUR = g_z_EUR;
        }
        string getIme(){
            return ime;
        }
        int getGodinaNaRagjanje(){
            return godina_na_ragjanje;
        }
        int getGodisnaZarabotuvackaEUR(){
            return godisna_zarabotuvacka_EUR;
        }
};

And class B using the class A as public:

class Fudbaler:public Sportist{
    private:
        int broj_na_odigrani_natprevari;
        int danocna_stapka;
    public:
        Fudbaler(string ime, int godina, int zarabotuvacka, int b, int d)
            :Sportist(ime, godina, zarabotuvacka)
        {
            broj_na_odigrani_natprevari = b;
            danocna_stapka = d;
        }
        float danok(){
            return getGodisnaZarabotuvackaEUR() * danocna_stapka;
        }
        friend ostream& operator<<(ostream &os, Fudbaler F){
            return os << "Ime: " << getIme() << endl
                      << "Godina na raganje: " << getGodinaNaRagjanje() << endl
                      << "Godisna zarabotuvacka(EUR): " << getGodisnaZarabotuvackaEUR() << endl
                      << "Danok sto treba da plati: " << danok();
        }
};

And I get 4 errors as described in title in these lines:

        return os << "Ime: " << getIme() << endl
                  << "Godina na raganje: " << getGodinaNaRagjanje() << endl
                  << "Godisna zarabotuvacka(EUR): " << getGodisnaZarabotuvackaEUR() << endl
                  << "Danok sto treba da plati: " << danok();

cannot call member function 'std::string Sportist::getIme()' without object

cannot call member function 'int Sportist::getGodinaNaRagjanje()' without object

cannot call member function 'int Sportist::getGodisnaZarabotuvackaEUR()' without object

cannot call member function 'float Fudbaler::danok()' without object

I dont understand why your operator overload is a friend function? — Cool_Coder
– Cool_Coder, Commented May 19, 2014 at 13:42
@Cool_Coder Because it's supposed to be? That's what my professor explained. — user3402189
– user3402189, Commented May 19, 2014 at 13:43

Zaiborg · Accepted Answer · 2014-05-19 13:43:02Z

1

i would say the function should be changed to

friend ostream& operator<<(ostream &os, Fudbaler F){
            return os << "Ime: " << F.getIme() << endl
                      << "Godina na raganje: " << F.getGodinaNaRagjanje() << endl
                      << "Godisna zarabotuvacka(EUR): " << F.getGodisnaZarabotuvackaEUR() << endl
                      << "Danok sto treba da plati: " << F.danok();
        }

I am not shure about operator overloading for the std::streams. i usually have done that outside of the class. From your error messages, you need to use the passed Fudbaler variable to access the methods of it.

answered May 19, 2014 at 13:43

Zaiborg

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