home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The CICA Windows Explosion!
/
The CICA Windows Explosion! - Disc 2.iso
/
programr
/
eckelt01.zip
/
15
/
MULTIPL3.CPP
< prev
next >
Wrap
C/C++ Source or Header
|
1995-02-23
|
3KB
|
80 lines
// File from page 655 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).
//////////////////////////////////////////////////
//: MULTIPL3.CPP -- Virtual base initialization
// Virtual base classes must always be
// Intialized by the "most-derived" class
#include <iostream.h>
#include "..\14\tstash.h"
class base {
public:
base(int) {}
virtual char* vf() const = 0;
};
class d1 : virtual public base {
public:
d1() : base(1) {}
char* vf() const { return "d1"; }
};
class d2 : virtual public base {
public:
d2() : base(2) {}
char* vf() const { return "d2"; }
};
class mi : public d1, public d2 {
public:
mi() : base(3) {}
char* vf() const {
return d1::vf(); // MUST disambiguate
}
};
class x : public mi {
public:
// You must ALWAYS init the virtual base:
x() : base(4) {}
};
main() {
tstash<base> b;
b.add(new d1);
b.add(new d2);
b.add(new mi); // OK
b.add(new x);
for(int i = 0; i < b.count(); i++)
cout << b[i]->vf() << endl;
}