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REFLEX.CPP
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1995-02-23
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62 lines
// File from page 449 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).
//////////////////////////////////////////////////
//: REFLEX.CPP -- Reflexivity in overloading
class number {
int i;
public:
number(int I = 0) { i = I; }
const number
operator+(const number& n) const {
return number(i + n.i);
}
friend const number
operator-(const number&, const number&);
};
const number
operator-(const number& n1,
const number& n2) {
return number(n1.i - n2.i);
}
main() {
number a(47), b(11);
a + b; // OK
a + 1; // 2nd arg converted to number
//! 1 + a; // Wrong! 1st arg not of type number
a - b; // OK
a - 1; // 2nd arg converted to number
1 - a; // 1st arg converted to number
}