Method index

examples/NoValues/mainwindow.cpp:64–71

    }

    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override
    {
        Q_UNUSED(row);
        Q_UNUSED(column);
        Q_UNUSED(parent);
        // qDebug() << "EmptyModel::index(" << row << column << ")";
        return QModelIndex();
    }

    QModelIndex parent(const QModelIndex &parent) const override
    {