passing 'const QList<Element>' as 'this' argument of 'QList<T>& QList<T>::operator<<(

[bigkoma]

Hi ,

when I compile my code, i have error :

passing 'const QList<Element>' as 'this' argument of 'QList<T>& QList<T>::operator<<(const T&) [with T = Element]' discards qualifiers

passing 'const QList<Element>' as 'this' argument of 'QList<T>& QList<T>::operator<<(const T&) [with T = Element]' discards qualifiers

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My class "Element" :

class Element
{
public:
    Element();
    Element(QString Aleja,QString Numer,QString Strona);
    QString Aleja;
    QString Numer;
    QString Strona;
};

class Element
{
public:
    Element();
    Element(QString Aleja,QString Numer,QString Strona);
    QString Aleja;
    QString Numer;
    QString Strona;
};

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And class "Strona" :

class Strona
{
public:
    Strona();
    QList<Element> listElementow;
    Element pobierzElement(QString NumerElementu);
    Element pobierzElement(int Index);
    void dodajElement(QString NrAleji,QString NrElementu,QString NrStrony) const;
};

class Strona
{
public:
    Strona();
    QList<Element> listElementow;
    Element pobierzElement(QString NumerElementu);
    Element pobierzElement(int Index);
    void dodajElement(QString NrAleji,QString NrElementu,QString NrStrony) const;
};

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and function where i have arror:

void Strona::dodajElement(QString NrAleji,QString NrElementu,QString NrStrony) const{
    listElementow << Element(NrAleji,NrElementu,NrStrony);
}

void Strona::dodajElement(QString NrAleji,QString NrElementu,QString NrStrony) const{
    listElementow << Element(NrAleji,NrElementu,NrStrony);
}

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So how a resolved this problem?