?? pgm09_01.cpp
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//// This file contains the C++ code from Program 9.1 of// "Data Structures and Algorithms// with Object-Oriented Design Patterns in C++"// by Bruno R. Preiss.//// Copyright (c) 1998 by Bruno R. Preiss, P.Eng. All rights reserved.//// http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm09_01.cpp//class Tree : public virtual Container{ class Iter;public: virtual Object& Key () const = 0; virtual Tree& Subtree (unsigned int) const = 0; virtual bool IsEmpty () const = 0; virtual bool IsLeaf () const = 0; virtual unsigned int Degree () const = 0; virtual int Height () const; virtual void DepthFirstTraversal (PrePostVisitor&) const; virtual void BreadthFirstTraversal (Visitor&) const; void Accept (Visitor&) const;};
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