🚀 go-pugleaf

I am reading code written by someone else in g++1.40.3.

This person wrote a class DList, which did not inherit anything,
and a class SDList which inherited from DList.

Both classes have this function:

DList *appendList (Dlist *pdl);

which do different things. I assume the one declared inside SDList
overrides the one in DList, as it appears to behave that way.

so my question: in normal C++, the appendList function should be declared
as virtual in DList (the superclass), while it is NOT declared virtual in
this particular program I am looking at... In g++ 1.40.3, are virtual
declarations OPTIONAL or something? I would have expected some sort of
compiler error from this code... Would there be a difference if I declared
the superclass function as virtual?

-- 
| Alan Ezust           ezust@iro.umontreal.ca      Montreal, Quebec, Canada |
|---------- Universite de Montreal    Departement d'informatique -----------|
        "Non-determinism means never having to say you're wrong."