Data Structures and Algorithms
with Object-Oriented Design Patterns in C++ 
Since the GeneralTree class is derived from the Tree base class, its interface comprises all of the public interfaces of the base classes. Furthermore, two member functions are added to the inherited interface--AttachSubtree, and DetachSubtree.
Since the GeneralTree class is a concrete class
derived from the an abstract base class,
it must provide implementations for all of the member functions
declared as pure virtual functions in the base class.
In the interest of brevity,
the declarations of these functions have been elided
from Program 
.
Copyright © 1997 by Bruno R. Preiss, P.Eng. All rights reserved.