C++ access object behind iterator in loop - c++

Question

I have created a list of objects of a class.
The class has an overloaded ostream << operator to output customer data in a structured way.
What I am trying to do is loop over the list of objects and call cout on the object in the iteration.
Code for the loop is as follows:
for (list<Kunde>::iterator it = this->kun_list.begin(); it != this->kun_list.end(); ++it) {
cout << it << endl;
}
With Kunde being the class with the overloaded << operator and kun_list being the list of objects of type Kunde.
friendly overload within the Kunde class:
friend ostream& operator<< (ostream& os, Kunde& kd) {
os << "__Kundendaten__" << endl;
os << "Name: " << kd.vorname << " " << kd.name << endl;
os << "Geburtsjahr: "<< kd.geburtsjahr << endl;
os << "Adresse: " << kd.strasse << " " << kd.hausnummer << endl << kd.plz << " " << kd.ort << endl;
os << "Telefon: " << kd.telefonnummer << endl;
string fschein = "Nein.";
if (kd.klasse_a_vorhanden) {fschein = "Ja.";}
os << "Führerschein Kl. A vorhanden: " << fschein << endl;
return os;
};
The above loop does not work because I am using the list iterator instead of an object of class Kunde. I can access members of Kunde via it→member but how do I use that iterator as reference to the whole object?
Thanks!

Answer 1

Use a const reference loop over the container:
for (const auto & kunde : kun_list) {
cout << kunde << endl;
}
Obviously you also have to fix <<:
friend ostream& operator<< (ostream& os, const Kunde& kd) {...}