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The CICA Windows Explosion!
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17
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RTSHAPES.CPP
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1995-02-23
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// File from page 725 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).
//////////////////////////////////////////////////
//: RTSHAPES.CPP -- Counting shapes
#include <iostream.h>
#include <time.h>
#include <typeinfo.h>
#include "..\14\tstash.h"
class shape {
protected:
static int count;
public:
shape() { count++; }
virtual ~shape() = 0 { count--; }
virtual void draw() const = 0;
static int quantity() { return count; }
};
int shape::count = 0;
class rectangle : public shape {
void operator=(rectangle&); // Disallow
protected:
static int count;
public:
rectangle() { count++; }
rectangle(const rectangle&) { count++;}
~rectangle() { count--; }
void draw() const {
cout << "rectangle::draw()" << endl;
}
static int quantity() { return count; }
};
int rectangle::count = 0;
class ellipse : public shape {
void operator=(ellipse&); // Disallow
protected:
static int count;
public:
ellipse() { count++; }
ellipse(const ellipse&) { count++; }
~ellipse() { count--; }
void draw() const {
cout << "ellipse::draw()" << endl;
}
static int quantity() { return count; }
};
int ellipse::count = 0;
class circle : public ellipse {
void operator=(circle&); // Disallow
protected:
static int count;
public:
circle() { count++; }
circle(const circle&) { count++; }
~circle() { count--; }
void draw() const {
cout << "circle::draw()" << endl;
}
static int quantity() { return count; }
};
int circle::count = 0;
main() {
tstash<shape> shapes;
time_t t;
// Seed random number generator:
srand((unsigned)time(&t));
const mod = 12;
for(int i = 0; i < rand() % mod; i++)
shapes.add(new rectangle);
for(i = 0; i < rand() % mod; i++)
shapes.add(new ellipse);
for(i = 0; i < rand() % mod; i++)
shapes.add(new circle);
int Ncircles = 0;
int Nellipses = 0;
int Nrects = 0;
int Nshapes = 0;
for(i = 0; i < shapes.count(); i++) {
shapes[i]->draw();
if(dynamic_cast<circle*>(shapes[i]))
Ncircles++;
if(dynamic_cast<ellipse*>(shapes[i]))
Nellipses++;
if(dynamic_cast<rectangle*>(shapes[i]))
Nrects++;
if(dynamic_cast<shape*>(shapes[i]))
Nshapes++;
}
cout << endl << endl
<< "circles = " << Ncircles << endl
<< "ellipses = " << Nellipses << endl
<< "rectangles = " << Nrects << endl
<< "shapes = " << Nshapes << endl
<< endl
<< "circle::quantity() = "
<< circle::quantity() << endl
<< "ellipse::quantity() = "
<< ellipse::quantity() << endl
<< "rectangle::quantity() = "
<< rectangle::quantity() << endl
<< "shape::quantity() = "
<< shape::quantity() << endl;
}