RE: libstdc++/6791: hash_map: bad end() iterator

[Vadim Ogranovich <vograno@arbitrade.com>]

The following reply was made to PR libstdc++/6791; it has been noted by GNATS.

From: Vadim Ogranovich <vograno@arbitrade.com>
To: "'paolo@gcc.gnu.org'" <paolo@gcc.gnu.org>,
   
	  "'gcc-bugs@gcc.gnu.org'"<gcc-bugs@gcc.gnu.org>,
   "'gcc-prs@gcc.gnu.org'" <gcc-prs@gcc.gnu.org>,
   "'nobody@gcc.gnu.org'" <nobody@gcc.gnu.org>,
   
	  "'paolo@gcc.gnu.org'"<paolo@gcc.gnu.org>,
    "'gcc-gnats@gcc.gnu.org'" <gcc-gnats@gcc.gnu.org>
Cc:  
Subject: RE: libstdc++/6791: hash_map: bad end() iterator
Date: Fri, 24 May 2002 13:30:29 -0500

 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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