Can someone please answer a few questions for me?

Say I have a class called SingleList which implements a singly linked
list.  I have a derived class called DoubleList which implements a doubly
linked list.  I have a structure for the SingleList.  Can I derive a
structure for the DoubleList which contains the structure for the
SingleList?

My basic problem is this:  I have a struct for the singly linked list.  I
would like to use this same struct for the doubly linked list plus a
previous pointer.  How would one implement this?

Thank you in advance!!

David Rodriguez
rodrig@nu.cs.fsu.edu