From: Petr Ovtchenkov <ptr@void-ptr.info>
To: "François Dumont" <frs.dumont@gmail.com>
Cc: libstdc++@gcc.gnu.org, gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] libstdc++: istreambuf_iterator proxy
Date: Tue, 10 Oct 2017 05:52:00 -0000 [thread overview]
Message-ID: <20171010085203.41604644@void-ptr.info> (raw)
In-Reply-To: <9cf75131-8450-42d6-a4ea-d917ab805fc7@gmail.com>
On Sun, 8 Oct 2017 16:59:39 +0200
François Dumont <frs.dumont@gmail.com> wrote:
> ...
> >>> We have three issues with istreambuf_iterator:
> >>> - debug-dependent behaviour
> >> Fixed.
> > + __glibcxx_requires_cond(_M_sbuf,
> > _M_message(__gnu_debug::__msg_inc_istreambuf)
> > ._M_iterator(*this));
> > vs
> >
> > + __glibcxx_requires_cond(_M_sbuf && !_S_is_eof(_M_sbuf->sgetc()),
> > _M_message(__gnu_debug::__msg_inc_istreambuf)
> > ._M_iterator(*this));
> >
> > and
> >
> > + __glibcxx_requires_cond(_M_sbuf
> > + && !traits_type::eq_int_type(_M_c,traits_type::eof()),
> > _M_message(__gnu_debug::__msg_inc_istreambuf)
> > ._M_iterator(*this));
> > vs
> >
> > + __glibcxx_requires_cond(_M_sbuf && !_S_is_eof(_M_sbuf->sgetc()),
> > _M_message(__gnu_debug::__msg_inc_istreambuf)
> > ._M_iterator(*this));
> >
> > I'm insist on the first variant. It free from code that may lead to different
> > behaviour between debug/non-debug (like _M_sbuf->sgetc()).
>
> The first patch fixed the impact of the Debug mode on the
> istreambuf_iterator state. This kind of difference is classical with
> Debug mode, this mode usually introduces additional calls to some
> operators or in this case to sgetc.
>
The key is "_M_sbuf->sgetc()" and "_S_is_eof" that may call ->sgetc() too.
This may lead to difference in debug/non-debug behaviour.
Solution without such difference exist and was presented here.
next prev parent reply other threads:[~2017-10-10 5:52 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-23 7:10 [PATCH] libstdc++: istreambuf_iterator keep attached streambuf Petr Ovtchenkov
2017-09-25 13:46 ` Jonathan Wakely
2017-09-28 10:34 ` Jonathan Wakely
2017-09-28 12:06 ` Petr Ovtchenkov
2017-09-28 12:38 ` Jonathan Wakely
2017-10-03 20:39 ` Petr Ovtchenkov
2017-10-04 5:04 ` [PATCH v2] " Petr Ovtchenkov
2017-10-06 16:01 ` [PATCH] libstdc++: istreambuf_iterator proxy (was: keep attached streambuf) François Dumont
2017-10-06 18:03 ` Petr Ovtchenkov
2017-10-08 15:45 ` [PATCH] libstdc++: istreambuf_iterator proxy François Dumont
2017-10-09 19:35 ` Petr Ovtchenkov
2017-10-10 5:52 ` Petr Ovtchenkov [this message]
2017-10-10 14:22 ` [PATCH] libstdc++: istreambuf_iterator proxy (was: keep attached streambuf) Jonathan Wakely
-- strict thread matches above, loose matches on Subject: below --
2017-10-13 17:22 Make istreambuf_iterator::_M_sbuf immutable and add debug checks François Dumont
2017-10-23 19:24 ` François Dumont
2017-11-06 21:20 ` François Dumont
2017-11-16 6:07 ` Petr Ovtchenkov
2017-11-16 11:29 ` Jonathan Wakely
2017-11-16 11:57 ` Jonathan Wakely
2017-11-16 12:25 ` Petr Ovtchenkov
2017-11-16 17:48 ` François Dumont
2017-11-16 18:24 ` Petr Ovtchenkov
2017-11-16 23:00 ` François Dumont
2017-09-27 20:16 Make tests less istreambuf_iterator implementation dependent François Dumont
2017-09-28 12:12 ` Jonathan Wakely
2017-09-28 19:59 ` François Dumont
2017-09-28 21:56 ` Jonathan Wakely
2017-10-02 5:43 ` François Dumont
2017-10-03 14:20 ` Jonathan Wakely
2017-10-04 16:21 ` François Dumont
2017-10-04 23:23 ` Jonathan Wakely
2017-11-15 20:54 ` [PATCH 1/4] Revert "2017-10-04 Petr Ovtchenkov <ptr@void-ptr.info>" Petr Ovtchenkov
2017-11-15 20:58 ` [PATCH 2/4] libstdc++: istreambuf_iterator keep attached streambuf Petr Ovtchenkov
2017-11-15 20:52 ` [PATCH 3/4] libstdc++: avoid character accumulation in istreambuf_iterator Petr Ovtchenkov
2017-11-15 20:52 ` [PATCH 4/4] libstdc++: immutable _M_sbuf " Petr Ovtchenkov
2017-11-15 22:30 ` [PATCH 3/4] libstdc++: avoid character accumulation " Paolo Carlini
2017-11-16 6:00 ` Petr Ovtchenkov
2017-11-16 9:51 ` Paolo Carlini
2017-11-16 11:34 ` Petr Ovtchenkov
2017-11-16 11:35 ` Paolo Carlini
2017-11-16 11:44 ` Petr Ovtchenkov
2017-11-16 11:57 ` Paolo Carlini
2017-11-16 11:03 ` [PATCH 1/4] Revert "2017-10-04 Petr Ovtchenkov <ptr@void-ptr.info>" Jonathan Wakely
2017-11-16 11:39 ` Petr Ovtchenkov
2017-11-16 11:41 ` Jonathan Wakely
2017-11-16 11:42 ` Jonathan Wakely
2017-11-16 12:03 ` Petr Ovtchenkov
2017-08-24 11:58 [PATCH] streambuf_iterator: avoid debug-dependent behaviour Petr Ovtchenkov
2017-09-01 9:10 ` Jonathan Wakely
2017-09-07 21:02 ` François Dumont
2017-09-08 5:47 ` Petr Ovtchenkov
2017-09-09 20:17 ` François Dumont
2017-09-21 5:46 ` François Dumont
2017-09-28 10:50 ` Jonathan Wakely
2017-09-28 10:58 ` Jonathan Wakely
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