Eclipse c++ method could not be resolved

Question

Header:

#ifndef patientenliste_hpp
#define patientenliste_hpp

#include <vector>
#include <iostream>
#include "patient.hpp"

using namespace std;

class Patientenliste
{
private:
    vector<Patient> liste;

public:
    Patientenliste& operator+= (const Patient&);

    friend ostream& operator<< (ostream&, const Patientenliste&);
};


ostream& operator<< (ostream&, const Patientenliste&);

#endif

Sourcecode:

#include "patientenliste.hpp"


Patientenliste::Patientenliste& operator+= (const Patient& p)
{
    liste.push_back(p);
    return *this;
}

ostream& operator<< (ostream& os, const Patientenliste& p)
{
    for(auto& i : p.liste)
        os << i;

    return os;
}

Why do I have to put "Patientenliste::" before "liste" in the operator definition += in the Sourcecode? Eclipse can't resolve it, but it should do, isn't it? Worked fine with my previous project...

Answer 1

This

Patientenliste::Patientenliste& operator+= (const Patient& p)

should be

Patientenliste& Patientenliste::operator+= (const Patient& p)

You are using Patientenliste:: as operator+= is in scope of that class i.e member of that class.