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The CICA Windows Explosion!
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17
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BEFORE.CPP
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1995-02-23
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84 lines
// 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).
//////////////////////////////////////////////////
//: BEFORE.CPP -- The "before()" function
#include <typeinfo.h>
#include <fstream.h>
ofstream out("before.out");
class base {
public:
virtual void x() {} // Install VPTR/VTABLE
};
class d1 : public base {};
class d2 : public d1 {};
class d3 : public d2 {} D3;
#define B(arg) \
if(arg) out << "true: "; \
else out << "false: "; \
out << #arg << endl;
main() {
base* bp = &D3; // Upcast
B(typeid(base).before(typeid(d1)));
B(typeid(base).before(typeid(d2)));
B(typeid(base).before(typeid(d3)));
B(typeid(base).before(typeid(base)));
out << endl;
B(typeid(d1).before(typeid(base)));
B(typeid(d2).before(typeid(base)));
B(typeid(d3).before(typeid(base)));
B(typeid(base).before(typeid(base)));
out << endl;
B(typeid(bp).before(typeid(d1)));
B(typeid(bp).before(typeid(d2)));
B(typeid(bp).before(typeid(d3)));
B(typeid(bp).before(typeid(base)));
out << endl;
B(typeid(*bp).before(typeid(d1)));
B(typeid(*bp).before(typeid(d2)));
B(typeid(*bp).before(typeid(d3)));
B(typeid(*bp).before(typeid(base)));
out << endl;
B(typeid(d1).before(typeid(bp)));
B(typeid(d2).before(typeid(bp)));
B(typeid(d3).before(typeid(bp)));
B(typeid(base).before(typeid(bp)));
out << endl;
B(typeid(d1).before(typeid(*bp)));
B(typeid(d2).before(typeid(*bp)));
B(typeid(d3).before(typeid(*bp)));
B(typeid(base).before(typeid(*bp)));
}