Bug#116875: marked as done (g++-3.0: nested type converter in initializer confuses gcc)
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From: Patrick Tullmann <pat@tullmann.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: g++-3.0: nested type converter in initializer confuses gcc
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Package: g++-3.0
Version: 1:3.0.2-0pre010922
Severity: normal
File: /usr/bin/g++-3.0
The attached file demonstrates that g++ (in Debian/testing) barfs on a
nested int conversion of a static function in a constructor expecting
an int. (See the main local variable 'broken' in the example.) My
expectation is that the 'broken' line is most similar to the
'alsoWorks' declaration.
The error message from g++ is:
gcc-bug-constructor.cc:36: request for member `field' in `broken', which is of
non-aggregate type `Foo ()(int (*)())'
My expectation is that 'broken' should be of type `Foo'.
I wouldn't put it past the C++ spec that 'broken' really isn't what I
intend, but even if that is the case, I can't imagine that the type in
the error message is right. (I read that as a function returning a
Foo that takes a pointer to an int-returning function as its only
argument.)
There are lots of workarounds (all the other Foo declarations in
main() have the same result), so this really isn't critical.
The g++ v2.95.4 which is also installed on my system reports the same
error message....
*** /home/pat/tmp/gcc-bug-constructor.cc
#include <cstdio>
// return type doesn't seem to matter
static long returnLong(void)
{
return 0;
}
class Foo
{
public:
int field;
Foo(int f)
: field(f)
{
}
};
int main(int, char **)
{
int ts = int(returnLong());
Foo works(ts);
Foo alsoWorks(static_cast<int>(returnLong()));
Foo stillWorks(returnLong());
Foo yetStillFine(int(0));
// This is the problematic line:
Foo broken(int(returnLong()));
// Just make sure they're used:
printf("%d, %d, %d, %d, %d\n",
works.field,
alsoWorks.field,
stillWorks.field,
yetStillFine.field,
broken.field);
}
-- System Information
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux pizza 2.4.7 #1 Tue Jul 24 00:58:43 MDT 2001 i686
Locale: LANG=C, LC_CTYPE=C
Versions of packages g++-3.0 depends on:
ii gcc-3.0 1:3.0.2-0pre010922 The GNU C compiler.
ii gcc-3.0-base 1:3.0.2-0pre010922 The GNU Compiler Collection (base
ii libc6 2.2.4-1 GNU C Library: Shared libraries an
ii libstdc++3-dev 1:3.0.2-0pre010922 The GNU stdc++ library version 3 (
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>From willy@www.linux.org.uk Thu Nov 29 09:31:23 2001
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Date: Thu, 29 Nov 2001 15:31:22 +0000
From: Matthew Wilcox <willy@debian.org>
To: 116875-close@bugs.debian.org
Subject: notabug
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problem lies in code, not the compiler.
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