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From: "Simpson, Kenny" <Kenny.Simpson@gs.com> To: bkoz@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org Subject: RE: libstdc++/2832 Date: Wed, 23 May 2001 07:36:00 -0000 [thread overview] Message-ID: <20010523143600.19958.qmail@sourceware.cygnus.com> (raw) The following reply was made to PR libstdc++/2832; it has been noted by GNATS. From: "Simpson, Kenny" <Kenny.Simpson@gs.com> To: "'bkoz@gcc.gnu.org'" <bkoz@gcc.gnu.org>, gcc-gnats@gcc.gnu.org, Kenny.Simpson@gs.com, nobody@gcc.gnu.org, theonetruekenny@yahoo.com Cc: Subject: RE: libstdc++/2832 Date: Wed, 23 May 2001 10:32:05 -0400 I don't have a copy of the Standard in front of me, but I do have _Standard C++ IOStreams and Locales_ by Langer and Kreft. p72 starts with: "rdbuf() SUBTLETIES Note the subtle difference between a concrete stream class's rdbuf() function and the inherited version of rdbuf(): The inherited rdbuf() function basic_ios<charT, traits>::rdbuf() returns the pointer to the stream buffer that is maintained by the base class. The concrete stream class's rdbuf() function returns a pointer to its contained stream buffer object." It goes on to include a simple example similar to the one I submitted with the report: " basic_filebuf<char> buf; buf.open("in.txt"); basic_ifstream<char> ifstr; // ifstr by default contains a file buffer object ifstr.basic_ios<char>::rdbuf(&buf); // here the file buffer pointer is replaced using the // hidden base class version of the rdbuf() function basic_streambuf<char>* bp; bp = ifstr.rdbuf(); // redefined rdbuf() returns pointer to contained, but // unused buffer bp = ifstr.basic_ios<char>::rdbuf(); // base class version of rdbuf() function returns // pointer to newly assigned and actually used file buffer. " -Kenny -----Original Message----- From: bkoz@gcc.gnu.org [ mailto:bkoz@gcc.gnu.org ] Sent: Tuesday, May 22, 2001 8:28 PM To: bkoz@gcc.gnu.org; gcc-gnats@gcc.gnu.org; Kenny.Simpson@gs.com; nobody@gcc.gnu.org; theonetruekenny@yahoo.com Subject: Re: libstdc++/2832 Synopsis: rdbuf methods incorrect Responsible-Changed-From-To: unassigned->bkoz Responsible-Changed-By: bkoz Responsible-Changed-When: Tue May 22 17:27:50 2001 Responsible-Changed-Why: Responsible State-Changed-From-To: open->analyzed State-Changed-By: bkoz State-Changed-When: Tue May 22 17:27:50 2001 State-Changed-Why: This seems to be two bugs: 1) pointers returned by rdbuf() not the same 2) [io]stringstream/[io]fstream dtors delete streambuf object. I don't see where, in the standard #1 is guaranteed. Perhaps you can point this out to me/ I do agree that #2 is a problem, and am working on a fix now. thanks, benjamin http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=2832&database=gcc
next reply other threads:[~2001-05-23 7:36 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2001-05-23 7:36 Simpson, Kenny [this message] -- strict thread matches above, loose matches on Subject: below -- 2001-05-26 2:26 libstdc++/2832 bkoz 2001-05-24 16:06 libstdc++/2832 bkoz 2001-05-23 11:16 libstdc++/2832 Simpson, Kenny 2001-05-22 17:36 libstdc++/2832 bkoz
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