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SSHAPE.CPP
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1995-02-23
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105 lines
// File from page 783 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).
//////////////////////////////////////////////////
//: SSHAPE.CPP -- "Virtual constructors"
// Used in a simple "shape" framework
#include <iostream.h>
#include "..\14\tstash.h"
class shape {
shape* S;
// Prevent copy-construction & operator=
shape(shape&);
shape operator=(shape&);
protected:
shape() { S = 0; };
public:
enum type { Circle, Square, Triangle };
shape(type); // "Virtual" constructor
virtual void draw() { S->draw(); }
virtual ~shape() {
cout << "~shape\n";
delete S;
}
};
class circle : public shape {
// Prevent copy-construction & operator=
circle(circle&);
circle operator=(circle&);
public:
circle() {}
void draw() { cout << "circle::draw\n"; }
~circle() { cout << "~circle\n"; }
};
class square : public shape {
// Prevent copy-construction & operator=
square(square&);
square operator=(square&);
public:
square() {}
void draw() { cout << "square::draw\n"; }
~square() { cout << "~square\n"; }
};
class triangle : public shape {
// Prevent copy-construction & operator=
triangle(triangle&);
triangle operator=(triangle&);
public:
triangle() {}
void draw() { cout << "triangle::draw\n"; }
~triangle() { cout << "~triangle\n"; }
};
shape::shape(type t) {
switch(t) {
case Circle: S = new circle; break;
case Square: S = new square; break;
case Triangle: S = new triangle; break;
}
draw(); // Virtual call in the constructor
}
main() {
tstash<shape> shapes; // Default to ownership
cout << "virtual constructor calls:" << endl;
shapes.add(new shape(shape::Circle));
shapes.add(new shape(shape::Square));
shapes.add(new shape(shape::Triangle));
cout << "virtual function calls:" << endl;
for(int i = 0; i < shapes.count(); i++)
shapes[i]->draw();
shape c(shape::Circle); // Can create on stack
}