?? pgm05_20.cpp
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//// This file contains the C++ code from Program 5.20 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_20.cpp//Object& Association::Key () const { return *key; }Object& Association::Value () const{ if (value == 0) return NullObject::Instance (); else return *value;}int Association::CompareTo (Object const& object) const{ Association const& association = dynamic_cast<Association const&> (object); return Key ().Compare (association.Key ());}void Association::Put (ostream& s) const{ s << "Association {" << *key; if (value != 0) s << ", " << *value; s << "}";}
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