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- // File from page 676 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).
- //////////////////////////////////////////////////
-
- //: PASTE.CPP -- Fixing a mess with MI
- #include <fstream.h>
- #include "..\15\vendor.h"
-
- ofstream out("paste.out");
-
- class mybase { // Repair vendor interface
- public:
- virtual void v() const = 0;
- virtual void f() const = 0;
- // New interface function:
- virtual void g() const = 0;
- virtual ~mybase() { out << "~mybase()\n"; }
- };
-
- class paste1 : public mybase, public vendor1 {
- public:
- void v() const {
- out << "paste1::v()\n";
- vendor1::v();
- }
- void f() const {
- out << "paste1::f()\n";
- vendor1::f();
- }
- void g() const {
- out << "paste1::g()\n";
- }
- ~paste1() { out << "~paste1()\n"; }
- };
-
- main() {
- paste1& p1p = *new paste1;
- mybase& mp = p1p; // Upcast
- out << "calling f()\n";
- mp.f(); // Right behavior
- out << "calling g()\n";
- mp.g(); // New behavior
- out << "calling A(p1p)\n";
- A(p1p); // Same old behavior
- out << "calling B(p1p)\n";
- B(p1p); // Same old behavior
- out << "delete mp\n";
- // Deleting a reference to a heap object:
- delete ∓ // Right behavior
- }
-