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- // File from page 560 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).
- //////////////////////////////////////////////////
-
- //: SLICE.CPP -- Object slicing
- #include <iostream.h>
-
- class base {
- int i;
- public:
- base(int I = 0) : i(I) {}
- virtual int sum() const { return i; }
- };
-
- class derived : public base {
- int j;
- public:
- derived(int I = 0, int J = 0)
- : base(I), j(J) {}
- int sum() const { return base::sum() + j; }
- };
-
- void call(base b) {
- cout << "sum = " << b.sum() << endl;
- }
-
- main() {
- base b(10);
- derived d(10, 47);
- call(b);
- call(d);
- }
-