Problema ridefinizione operatore <<

[valo87]

Come compilatore uso gcc.

Interfaccia Docente

#define DOCENTE_H

#include<string>
using std:: string;

#include <iostream>
using std :: istream;
using std :: ostream;

class Docente{
friend ostream& operator<<(ostream&, const Docente&); 
friend istream& operator>>(istream&, Docente&);
    public:
        Docente(string, string);
        void stampa();
        string getNome();
        string getCognome();
    private:
        string nome,cognome;
};


#endif

Docente.cpp

#include "Docente.h"

#include <iostream>
using std :: cout;
using std :: endl;
using std ::istream;
using std :: ostream;

#include <string>
using std :: string;

Docente :: Docente(string n, string c){
    nome = n;
    cognome = c;
}

void Docente :: stampa(){
    cout << "Docente : " << nome << cognome;
}

string Docente :: getNome(){
    return nome;
}

string Docente :: getCognome(){
    return cognome;
}

ostream& operator<<(ostream& out,const Docente &d){
    out << d.nome << " "<< d.cognome;
    return out;
}

istream& operator>>(istream& in, Docente &d){
    string n,c;
    in >> n >> c;
    d.nome = n;
    d.cognome = c;
    return in;
}