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Path: utzoo!utgpu!water!watmath!watdragon!violet!gjditchfield
From: gjditchfield@violet.UUCP
Newsgroups: comp.lang.c++
Subject: another bug?
Message-ID: <3851@watdragon.waterloo.edu>
Date: Mon, 19-Oct-87 14:22:54 EDT
Article-I.D.: watdrago.3851
Posted: Mon Oct 19 14:22:54 1987
Date-Received: Tue, 20-Oct-87 03:15:48 EDT
Sender: daemon@watdragon.waterloo.edu
Distribution: comp
Lines: 42
Keywords: inherited operator=


I think this is a bug, but it may be that I don't understand the
interaction of inheritance and operators.
----------------------------------------------------------------
class base {
	int i;
    public:
	base() {i = 10;};
	int operator=( int ip) { int t = i; i = ip; return t;};
};

class derived: public base {
	float f;
    public:
	derived():() {};
};

#include <stream.h>
main () {
	base b;
	derived d;
	cout << ( b=(5) );
	cout << b.operator=(4);

	cout << d.operator=(15);
	cout << ( d=(16) );		// line 22
};
------------------------------------------------------------
ccc  dervEq.cc:
"dervEq.cc", line 22: error: assignment not defined for class derived
"dervEq.cc", line 22: error:  pointer operand for  <<

If "a = b" and "a.operator=(b)" are equivalent (lines 18, 19), and if
derived did inherited "operator=" (line 21), why doesn't line 22 work?

Oh, yes: C++ version 1.2.1, BSD 4.3 on a vax.  The same for my previous
posting, "Bug?"
--
Glen Ditchfield                      {watmath,utzoo,ihnp4}!watrose!gjditchfield
Dept of Computer Science, U of Waterloo         (519) 885-1211 x6658
Waterloo, Ontario, Canada			   Office: MC 2006
If you grab the bull by the horns, you at least confuse him -- R.A.Heinlein