From mboxrd@z Thu Jan  1 00:00:00 1970
From: nathan@gcc.gnu.org
To: nobody@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org
Subject: Re: c++/2910
Date: Mon, 28 May 2001 04:36:00 -0000
Message-id: <20010528113602.22834.qmail@sourceware.cygnus.com>
X-SW-Source: 2001-05/msg00942.html
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR c++/2910; it has been noted by GNATS.

From: nathan@gcc.gnu.org
To: Christoph.Pesch@web.de, gcc-gnats@gcc.gnu.org, nobody@gcc.gnu.org
Cc:  
Subject: Re: c++/2910
Date: 28 May 2001 11:29:55 -0000

 Synopsis: dynamic_cast seems to lose or change information
 
 State-Changed-From-To: analyzed->closed
 State-Changed-By: nathan
 State-Changed-When: Mon May 28 04:29:54 2001
 State-Changed-Why:
     further email from originator points out this invokes undefined effects.
     specifically we bind a temporary to a reference, and then
     the temporary goes out of scope. The dynamic cast
     version fails, as they dynamic cast is implemented by a function
     call which clobbers the memory of that temporary. The
     static cast case does not fail, because memory happens to
     have the right things in it.
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=2910&database=gcc