model conception

[xavier]

Yes, I could do that but there is a problem of type casts.

Indeed, the compiler can easily cast say between Car and Object, but vector<Car*> and vector<Object*> won't work.

So my library returns a vector<Car*>&, and the GUI cannot simply treat it as a vector<Object*>&. Except if I provide an explicit cast function, but I don't know how to do that. (I can not simply cast every item in a new vector, since I need to operate on the vector itself).

Anyway, the Qt documentation is not very clear about templates. It only says:

moc does not handle all of C++. The main problem is that class templates cannot have signals or slots. Here is an example:

class SomeTemplate<int> : public QFrame
{
Q_OBJECT
...

signals:
void mySignal(int);
};

So the derived class can't have signals. How about the base class? Is this valid:

template<class T> class SomeTemplate : public QTableModel
    {
        Q_OBJECT
        ...
 
    signals:
        void mySignal(int);
    };

template<class T> class SomeTemplate : public QTableModel
    {
        Q_OBJECT
        ...

    signals:
        void mySignal(int);
    };

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