Bug#171123: marked as done (g++-3.2: incorrect use of default assignment operator?)
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>From bab@ms.unimelb.edu.au Thu Nov 28 22:38:41 2002
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From: Ben Burton <bab@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: g++-3.2: incorrect use of default assignment operator?
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Date: Fri, 29 Nov 2002 15:37:06 +1100
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Package: g++-3.2
Version: 1:3.2.1-1
Severity: normal
Hi. Both g++-3.2 and g++-2.95 seem to have problems with the following
code.
#include <iostream>
struct Foo {
int val;
Foo(int newVal) {
val = newVal;
}
Foo& operator = (const Foo& other) {
val = 2;
}
};
int main() {
Foo foo(5);
Foo bar = foo;
std::cout << bar.val << std::endl;
return 0;
}
Under both compilers, the program compiles fine and then runs,
outputting the integer 5.
I would have expected a compile error, since the declaration
"Foo bar = foo;" tries to use the non-existant default constructor for
class Foo.
But even if it did build, I would have expected the program to output
the integer 2, since the = operator has been explicitly overridden.
What it seems to be doing is making its own default constructor and then
calling its own default assignment operator instead of the custom one
that has been defined.
Perhaps I'm just misunderstanding the finer details of the C++ specs?
Thanks - Ben.
-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux phoenix 2.4.19-686 #1 Sun Oct 6 18:37:38 EST 2002 i686
Locale: LANG=C, LC_CTYPE=C
Versions of packages g++-3.2 depends on:
ii gcc-3.2 1:3.2.1-1 The GNU C compiler.
ii gcc-3.2-base 1:3.2.1-1 The GNU Compiler Collection (base
ii libc6 2.3.1-5 GNU C Library: Shared libraries an
ii libstdc++5-dev 1:3.2.1-1 The GNU stdc++ library version 3 (
-- no debconf information
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Received: (at 171123-done) by bugs.debian.org; 29 Nov 2002 13:41:55 +0000
>From martin@v.loewis.de Fri Nov 29 07:41:55 2002
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To: 171123-done@bugs.debian.org
Subject: Re: Bug#171123: g++-3.2: incorrect use of default assignment operator?
References: <[🔎] E18Hctn-0008VM-00@phoenix.ms.unimelb.edu.au>
<[🔎] m3bs48x0ha.fsf@mira.informatik.hu-berlin.de>
<[🔎] 20021129115241.GA19427@baasil.humbug.org.au>
From: martin@v.loewis.de (Martin v. =?iso-8859-15?q?L=F6wis?=)
Date: 29 Nov 2002 14:41:40 +0100
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Ben Burton <bab@debian.org> writes:
> Hmm, okay, my bad. I'm reading through 12.8 now and it seems the
> implicit copy constructor is always available, not just when no other
> constructors are defined as I had thought.
>
> If you agree with this then please go ahead and close this bug.
I certainly agree; there is no bug in the compiler.
Regards,
Martin
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