From: "François Dumont" <frs.dumont@gmail.com>
To: Jonathan Wakely <jwakely@redhat.com>
Cc: "libstdc++@gcc.gnu.org" <libstdc++@gcc.gnu.org>,
gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH][_GLIBCXX_DEBUG] Remove useless checks
Date: Mon, 23 Jan 2023 19:15:27 +0100 [thread overview]
Message-ID: <290812af-847c-c6dd-3a56-fc51fc839dd3@gmail.com> (raw)
In-Reply-To: <CACb0b4=2yVEUK_2i0nDgdbhQktvzvcRHqma0TeMQ5Nhva7=Zag@mail.gmail.com>
On 23/01/23 10:22, Jonathan Wakely wrote:
> On Mon, 23 Jan 2023 at 06:02, François Dumont via Libstdc++
> <libstdc++@gcc.gnu.org> wrote:
>> libstdc++: [_GLIBCXX_DEBUG] Remove useless constructor checks
>>
>> Creating a safe iterator from a normal iterator is done within the
>> library where we
>> already know that it is done correctly. The rare situation where a
>> user would use safe
>> iterators for his own purpose is non-Standard code so outside
>> _GLIBCXX_DEBUG scope. For
>> those reasons the __msg_init_singular is useless and can be removed.
>>
>> Additionally in the copy constructor used for post-increment and
>> post-decrement operators
>> the __msg_init_copy_singular check can also be ommitted because of
>> the preliminary
>> __msg_bad_inc and __msg_bad_dec checks.
>>
>> libstdc++-v3/ChangeLog:
>>
>> * include/debug/safe_iterator.h
>> (_Safe_iterator<>::_Unsafe_call): New.
> I don't like the name "unsafe call". Why is it unsafe? As you say
> above, we don't need to check because we know that it's only called in
> a context where it's safe. Can we call it _Unchecked instead of
> _Unsafe_call? That seems like a more accurate description of the
> behaviour.
>
>
>> (_Safe_iterator(const _Safe_iterator&, _Unsafe_call): New.
>> (_Safe_iterator::operator++(int)): Use latter.
>> (_Safe_iterator::operator--(int)): Likewise.
>> (_Safe_iterator(_Iterator, const _Safe_sequence_base*)):
>> Remove !_M_insular()
>> check.
>> * include/debug/safe_local_iterator.h
>> (_Safe_local_iterator<>::_Unsafe_call):
>> New.
>> (_Safe_local_iterator(const _Safe_local_iterator&,
>> _Unsafe_call): New.
>> (_Safe_local_iterator::operator++(int)): Use latter.
>> * src/c++11/debug.cc (_S_debug_messages): Add as comment
>> the _Debug_msg_id
>> entry associated to the array entry.
> These comments are a great idea, thanks.
>
> If you agree with the _Unchecked name, OK to commit with that change.
>
It's unsafe because it's unchecked so _Unchecked is fine for me too :-)
Committed with the requested change.
Thanks
next prev parent reply other threads:[~2023-01-23 18:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-23 6:02 François Dumont
2023-01-23 9:22 ` Jonathan Wakely
2023-01-23 18:15 ` François Dumont [this message]
2023-01-23 18:25 ` Jonathan Wakely
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