Compiler complains about calling base class function 'index(int,int)' in class inherited from QAbstractTableModel

[Robert Hairgrove]

Using Qt 5.15.13 and g++ compiler version 13.3.0 on Ubuntu 24.04.3:

In the implementation of the setData() override I want to emit the signal dataChanged over a range of indexes. I have this code which won't compile:

        QModelIndex idx_topleft = index(0,0);
        QModelIndex idx_bottomright = index(rowCount()-1,columnCount()-1);

The error I am shown is this:

error: no match for call to ‘(const QModelIndex) (int, int)’

which is strange because index() is a public member function of the base class QAbstractTableModel.

However, if I call it this way:

        QModelIndex idx_topleft = this->index(0,0);
        QModelIndex idx_bottomright = this->index(rowCount()-1,columnCount()-1);

or if I fully qualify the call with the base class name, it works.
Does this have something to do with "Koenig lookup" rules?

[Bonnie]

You probably have const QModelIndex &index in the parameters of setData(), right?

[JonB]

@Robert-Hairgrove
If this is inside your override defined as setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) then obviously you have a local variable named index.

Either use the "full qualification" of this->index to disambiguate or rename your index formal parameter in the declaration.

[Robert Hairgrove]

@Bonnie Thanks -- yes, that was exactly the problem! :)

The Qt Creator wizard "helpfully" set up the parameters like this when I added the class. When I changed the parameter name, it works without qualifying the function call.

Marking this now as "solved".