?? pgm05_03.cpp
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//// This file contains the C++ code from Program 5.3 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/pgm05_03.cpp//#include <typeinfo>Object::~Object () {}bool Object::IsNull () const { return false; }int Object::Compare (Object const& object) const{ if (typeid (*this) == typeid (object)) return CompareTo (object); else if (typeid (*this).before (typeid (object))) return -1; else return 1;}
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