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The CICA Windows Explosion!
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eckelt01.zip
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14
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BEARS.CPP
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1995-02-23
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// Non-printed example in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT01.ZIP 2/21/95
// Copyright (c) Bruce Eckel, 1995
// Source code file from the book "Thinking in C++",
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following
// statements: You may freely use this file for your own
// work, including modifications and distribution in
// executable form only. You may copy and distribute this
// file, as long as it is only distributed in the complete
// (compressed) package with the other files from this
// book and you do not remove this copyright and notice.
// You may not distribute modified versions of the source
// code in this package. This package may be freely placed
// on bulletin boards, internet nodes, shareware disks and
// product vendor disks. You may not use this file in
// printed media without the express permission of the
// author. Bruce Eckel makes no
// representation about the suitability of this software
// for any purpose. It is provided "as is" without express
// or implied warranty of any kind. The entire risk as to
// the quality and performance of the software is with
// you. Should the software prove defective, you assume
// the cost of all necessary servicing, repair, or
// correction.
// If you think you've found an error, please
// email all modified files with loudly commented changes
// to: eckel@aol.com (please use the same
// address for non-code errors found in the book).
//////////////////////////////////////////////////
//: BEARS.CPP -- Containers & polymorphism
#include <iostream.h>
#include "..\14\tstack.h"
class bear {
public:
virtual void who() const = 0;
virtual ~bear() = 0 {} // Must have a body
};
class mama : public bear {
public:
void who() const {
cout << "Big bad mama bear" << endl;
}
~mama() { cout << "~mama" << endl; }
};
class daddy : public bear {
public:
void who() const {
cout << "Thoughtful, Reserved daddy bear"
<< endl;
}
~daddy() { cout << "~daddy" << endl; }
};
class baby : public bear {
public:
void who() const {
cout << "Little tiny baby bear" << endl;
}
~baby() { cout << "~baby" << endl; }
};
main() {
tstack<bear> bears; // Default to ownership
bears.push(new baby);
bears.push(new daddy);
bears.push(new mama);
tstackIterator<bear> goldy(bears);
// Polymorphism in action:
while(goldy) {
goldy->who(); // Smart pointer call
goldy++;
}
}