help needed with classes/inheritance

[barbaros]

Thanks to Paul McGuire and Bruno Desthuilliers for their comprehensive
answers. This is exactly what I was looking for, except I did not know
the correct name (composition/delegation). Now all I have to do is to
study the supplied code, understand it and adapt it to my problem.

Thank you very much. Cristian Barbarosie
http://cmaf.ptmat.fc.ul.pt/~barbaros