QAbstractListModel attempting to reference a deleted function

[Mihaill]

Hi!
I create class

class MarkerModel : public QAbstractListModel
{
    Q_OBJECT

public:
    using QAbstractListModel::QAbstractListModel;
    enum MarkerRoles{positionRole = Qt::UserRole + 1,
                    idRole};

    MarkerModel();
    MarkerModel(const MarkerModel & refModel);
    ~MarkerModel();
    bool operator != (MarkerModel const & refModel) {return !(m_ids == refModel.m_ids);}
    bool operator == (MarkerModel const & refModel) {return  (m_ids == refModel.m_ids);}

//    Q_INVOKABLE void addMarker(const QGeoCoordinate &coordinate);

    int rowCount(const QModelIndex &parent = QModelIndex()) const override;

    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;

    QHash<int, QByteArray> roleNames() const;

public slots:
    void addMarker(const int &id, const QGeoCoordinate &coordinate);

private:
    QList<QGeoCoordinate> m_coordinates;
    QList<int> m_ids;
};

And when I want add object MarkerModel in QMap, then I get error:

QAbstractListModel attempting to reference a deleted function
/:\QtProjects\qsingleteleshell\BModules\mmTerminal\backend\client.cpp:55: ошибка: C2280: 'MarkerModel &MarkerModel::operator =(const MarkerModel &)': attempting to reference a deleted function
..\..\..\qsingleteleshell\BModules\mmTerminal\backend\client.cpp(55): error C2280: 'MarkerModel &MarkerModel::operator =(const MarkerModel &)': attempting to reference a deleted function
C:\QtProjects\qsingleteleshell\BModules\mmTerminal\backend\markermodel.h(36): note: compiler has generated 'MarkerModel::operator =' here
C:\QtProjects\qsingleteleshell\BModules\mmTerminal\backend\markermodel.h(36): note: 'MarkerModel &MarkerModel::operator =(const MarkerModel &)': function was implicitly deleted because a base class invokes a deleted or inaccessible function 'QAbstractListModel &QAbstractListModel::operator =(const QAbstractListModel &)'
C:\Qt\5.15.2\msvc2019_64\include\QtCore/qabstractitemmodel.h(434): note: 'QAbstractListModel &QAbstractListModel::operator =(const QAbstractListModel &)': function was explicitly deleted

[J.Hilk]

@Mihaill has nothing to do with QAbstractListModel.
In general you CAN NOT COPY a QObject, thats by design.

you can only copy the pointer to a QObject

[JonB]

@J-Hilk
Absolutely true. But I do not see any attempt to assign/copy in any of the code shown by the OP. Are you saying the error arises because elsewhere he is trying to copy his MarkerModel?

[J.Hilk]

@JonB said in QAbstractListModel attempting to reference a deleted function:

Are you saying the error arises because elsewhere he is trying to copy his MarkerModel?

absolutely, it says so on the error log:

MarkerModel &MarkerModel::operator =(const MarkerModel &)': attempting to reference a deleted function

referenced here:
\QtProjects\qsingleteleshell\BModules\mmTerminal\backend\client.cpp:55:

that said, this:

MarkerModel(const MarkerModel & refModel);

is a copy constructor, also not allowed

[JonB]

@J-Hilk said in QAbstractListModel attempting to reference a deleted function:

MarkerModel(const MarkerModel & refModel);

Got it, thanks!