inheritence and virtual

[Zlatomir]

You need to use pointers to achieve that, something like this:

QList<PathPiece*> list;

QList<PathPiece*> list;

To copy to clipboard, switch view to plain text mode 

you are truncating your values if you don't.

So: Base obj = Derived objD; //isn't valid it performs a cast and you will have a Base object
You need Base* obj = Derived *objD; // and this is ok, virtual mechanism works with this

[Cruz]

Thank you for the clarification!

[Zlatomir]

Your welcome, careful the last two line isn't c++ code, i said it in c++ style, just to make an example.

And for your Base class write a destructor and declare it virtual (so the objects get destroyed properly no mater what object the Base pointer points to)