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RE: libstdc++/6791: hash_map: bad end() iterator
- From: Vadim Ogranovich <vograno at arbitrade dot com>
- To: "'paolo at gcc dot gnu dot org'" <paolo at gcc dot gnu dot org>, "'gcc-bugs at gcc dot gnu dot org'"<gcc-bugs at gcc dot gnu dot org>, "'gcc-prs at gcc dot gnu dot org'" <gcc-prs at gcc dot gnu dot org>, "'nobody at gcc dot gnu dot org'" <nobody at gcc dot gnu dot org>, "'paolo at gcc dot gnu dot org'"<paolo at gcc dot gnu dot org>, "'gcc-gnats at gcc dot gnu dot org'" <gcc-gnats at gcc dot gnu dot org>
- Date: Fri, 24 May 2002 13:30:29 -0500
- Subject: RE: libstdc++/6791: hash_map: bad end() iterator
Sorry for the false report. Thank you for the explanations, Vadim
-----Original Message-----
From: paolo@gcc.gnu.org [mailto:paolo@gcc.gnu.org]
Sent: Friday, May 24, 2002 10:37 AM
To: gcc-bugs@gcc.gnu.org; gcc-prs@gcc.gnu.org; nobody@gcc.gnu.org;
paolo@gcc.gnu.org; vograno@arbitrade.com
Subject: Re: libstdc++/6791: hash_map: bad end() iterator
Synopsis: hash_map: bad end() iterator
Responsible-Changed-From-To: unassigned->paolo
Responsible-Changed-By: paolo
Responsible-Changed-When: Fri May 24 10:36:38 2002
Responsible-Changed-Why:
Triaged.
State-Changed-From-To: open->closed
State-Changed-By: paolo
State-Changed-When: Fri May 24 10:36:38 2002
State-Changed-Why:
User error. See Josuttis pp. 204-205 for a clear
explanation of why this is, in general, an incorrect use
of erase() (it works for map only "by chance"). In a
nutshell, fooH.erase(iter) invalidates iter as an iterator
of HT and the following ++iter results in undefined
behavior. The correct way is the following:
...
for (HT::iterator iter=fooH.begin(); iter!=fooH.end();) {
cerr << "erasing\n";
fooH.erase(iter++);
}
...
Thanks for your report, Paolo.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p
r=6791
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