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10
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IOSOP.CPP
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1995-02-23
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// File from page 428 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).
//////////////////////////////////////////////////
//: IOSOP.CPP -- Iostream operator overloading
// Example of non-member overloaded operators
#include <iostream.h>
#include <strstrea.h>
#include <string.h>
#include "..\allege.h"
class intarray {
enum { sz = 5 };
int i[sz];
public:
intarray() {
memset(i, 0, sz* sizeof(*i));
}
int& operator[](int x) {
allege(x >= 0 && x < sz,
"operator[] out of range");
return i[x];
}
friend ostream&
operator<<(ostream& os,
const intarray& ia);
friend istream&
operator>>(istream& is, intarray& ia);
};
ostream& operator<<(ostream& os,
const intarray& ia){
for(int j = 0; j < ia.sz; j++) {
os << ia.i[j];
if(j != ia.sz -1)
os << ", ";
}
os << endl;
return os;
}
istream& operator>>(istream& is, intarray& ia){
for(int j = 0; j < ia.sz; j++)
is >> ia.i[j];
return is;
}
main() {
istrstream input("47 34 56 92 103");
intarray I;
input >> I;
I[4] = -1; // Use overloaded operator[]
cout << I;
}