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Groups > comp.lang.c > #157254
| From | Tim Rentsch <tr.17687@z991.linuxsc.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: arranging items in a array with a sorted pointer-list |
| Date | 2020-12-13 11:06 -0800 |
| Organization | A noiseless patient Spider |
| Message-ID | <86v9d5zfsf.fsf@linuxsc.com> (permalink) |
| References | (8 earlier) <20201130142116.891@kylheku.com> <1by2ii72fj.fsf@pfeifferfamily.net> <20201130174257.91@kylheku.com> <86y2ihoijs.fsf@linuxsc.com> <871rg9o0x3.fsf@nosuchdomain.example.com> |
Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>
>> Kaz Kylheku <563-365-8930@kylheku.com> writes:
>>
>>> On 2020-12-01, Joe Pfeiffer <pfeiffer@cs.nmsu.edu> wrote:
>>>
>>>> Kaz Kylheku <563-365-8930@kylheku.com> writes:
>>>>
>>>>> It can be the case that at the time the cast is written, there is no
>>>>> const qualifier being cast away. The accident occurs when someone
>>>>> later introduces const, and that cast now silently subverts it.
>>>>
>>>> Raising a question -- what would have been the downside (note that I'm
>>>> recognizing it's Too Late, just Monday morning quarterbacking), when
>>>> const was added to the language, to defining the cast so it doesn't
>>>> throw the const away?
>
> [...]
>
>>> I think that it would be a good choice for C++ or a C dialect
>>> inspired by C++, in which there are overloaded functions and other
>>> features.
>>>
>>> jhere is the problem that the current function
>>>
>>> char *strchr(const char *str, int ch);
>>>
>>> could not be written in that dialect. [...]
>>
>> Think again. Yes it could.
>
> You have a habit of (it seems) deliberately withholding information
> by alluding to some idea and expecting others to do the research
> to reinforce your conclusions. I find it annoying. Does anyone
> else find it at all useful?
There are a lot of different factors that go into deciding what
to say when I post. Let me go through some recent examples.
In a thread about how to rearrange elements of an array, I posted
that I had a short function to do it but did not post the
function. Because no algorithm had been posted, someone else
following up to my posting thought about the problem and posted a
solution that was a nice improvement over my own.
In a thread about changing the semantics of pointer casts so
'const' would be preserved, I posted a comment about several
points, but notably including a statement about being able to
provide a const-preserving cast using _Generic. My post included
a short example of how to do that.
In this very thread, I implied that a const-removing conversion
could be accomplished but didn't say how. Discussion following
that comment turned up several different was of thinking about
how a const-removing conversion might be effect, including a very
nice technique from Ben Bacarisse. Of course I don't know for
sure but I suspect the discussion would not have been as diverse
if I had simply stated one way right at the outset.
In each of those cases I'm happy with the outcome, and I think other
people reading the thread probably benefited from my choice, even if
the OP being responded to didn't feel that way. Those sorts of
considerations aren't always obvious. Note also that not providing
information is not the same as withholding it - I might choose not
to say much at the start of a conversation and then say more later,
depending on which way the discussion goes.
Let me ask you about a case that has come up just today. Looking
over the programs posted to solve the decommenting exercise, there
was one that showed surprising behavior, and I ended up tracking
down several defects in the code. Now having this information, what
should I do about it? Should I
* post nothing at all?
* post a statement saying the code has problems but not
say anything about what the problems are?
* show some test cases that evoke bad output?
* identify a particular function where the problems are
but not say any more than that?
* say what the problems are but not more than that?
* post revised code that fixes the problems?
It isn't obvious to me which of these choices (and the list is not
exhaustive) is the best choice overall for all concerned, including
readers other than the poster whose code is involved. I think
different people would prefer different choices. What's a good
choice for what to do here? I'm interested to hear your assessment.
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arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-28 11:00 +0100
Re: arranging items in a array with a sorted pointer-list Melzzzzz <Melzzzzz@zzzzz.com> - 2020-11-28 10:49 +0000
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-28 12:12 +0100
Re: arranging items in a array with a sorted pointer-list Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-11-28 03:21 -0800
Re: arranging items in a array with a sorted pointer-list Richard Damon <Richard@Damon-Family.org> - 2020-11-28 08:32 -0500
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-28 14:49 +0100
Re: arranging items in a array with a sorted pointer-list scott@slp53.sl.home (Scott Lurndal) - 2020-11-28 16:08 +0000
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-28 17:16 +0100
Re: arranging items in a array with a sorted pointer-list Bart <bc@freeuk.com> - 2020-11-28 16:23 +0000
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-28 17:35 +0100
Re: arranging items in a array with a sorted pointer-list "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2020-11-28 17:34 +0100
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-28 17:38 +0100
Re: arranging items in a array with a sorted pointer-list Richard Damon <Richard@Damon-Family.org> - 2020-11-28 13:03 -0500
Re: arranging items in a array with a sorted pointer-list Tim Woodall <news001@woodall.me.uk> - 2020-11-28 23:40 +0000
Re: arranging items in a array with a sorted pointer-list Dolores Filandro <dolfiland8@gmail.com> - 2020-12-23 13:06 -0800
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-11-28 18:08 +0000
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-28 19:14 +0100
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-11-28 19:14 +0000
Re: arranging items in a array with a sorted pointer-list Tim Woodall <news001@woodall.me.uk> - 2020-11-28 18:13 +0000
Re: arranging items in a array with a sorted pointer-list Siri Cruise <chine.bleu@yahoo.com> - 2020-11-28 17:16 -0800
Re: arranging items in a array with a sorted pointer-list Juha Nieminen <nospam@thanks.invalid> - 2020-11-29 09:41 +0000
Re: arranging items in a array with a sorted pointer-list Siri Cruise <chine.bleu@yahoo.com> - 2020-11-29 02:16 -0800
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-11-29 18:32 +0000
Re: arranging items in a array with a sorted pointer-list Juha Nieminen <nospam@thanks.invalid> - 2020-11-30 09:01 +0000
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-30 13:03 +0000
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-11-30 20:46 +0000
Re: arranging items in a array with a sorted pointer-list scott@slp53.sl.home (Scott Lurndal) - 2020-11-30 21:03 +0000
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-11-30 22:27 +0000
Re: arranging items in a array with a sorted pointer-list Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-11-30 18:14 -0700
Re: arranging items in a array with a sorted pointer-list James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-11-30 23:02 -0500
Re: arranging items in a array with a sorted pointer-list Dolores Filandro <dolfiland8@gmail.com> - 2020-11-30 20:12 -0800
Re: arranging items in a array with a sorted pointer-list scott@slp53.sl.home (Scott Lurndal) - 2020-12-01 15:04 +0000
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-12-01 22:10 +0000
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-12-01 22:25 +0000
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-12-01 23:43 +0000
Re: arranging items in a array with a sorted pointer-list James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-12-01 23:25 -0500
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-12-02 14:53 +0000
Re: arranging items in a array with a sorted pointer-list Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-12-02 07:03 -0800
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-12-02 23:48 +0000
Re: arranging items in a array with a sorted pointer-list James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-12-02 11:13 -0500
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-12-06 05:34 -0800
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-12-02 16:25 +0000
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-12-02 23:58 +0000
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-12-03 21:16 -0800
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-12-01 07:33 +0000
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-12-01 03:46 -0800
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-12-01 17:15 +0000
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-12-04 00:17 -0800
Re: arranging items in a array with a sorted pointer-list Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-12-01 10:07 -0800
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-12-13 11:06 -0800
Re: arranging items in a array with a sorted pointer-list Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-12-01 07:04 -0800
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-12-01 04:09 -0800
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-11-29 18:28 +0000
Re: arranging items in a array with a sorted pointer-list dave_thompson_2@comcast.net - 2021-01-31 16:03 -0500
Re: arranging items in a array with a sorted pointer-list Richard Damon <Richard@Damon-Family.org> - 2020-11-29 14:01 -0500
Re: arranging items in a array with a sorted pointer-list Juha Nieminen <nospam@thanks.invalid> - 2020-11-30 09:05 +0000
Re: arranging items in a array with a sorted pointer-list Richard Damon <Richard@Damon-Family.org> - 2020-11-30 07:09 -0500
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-30 13:06 +0000
Re: arranging items in a array with a sorted pointer-list Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-11-30 06:28 -0800
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-30 15:50 +0000
Re: arranging items in a array with a sorted pointer-list James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-11-30 10:07 -0500
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-30 15:26 +0000
Re: arranging items in a array with a sorted pointer-list James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-11-30 10:02 -0500
Re: arranging items in a array with a sorted pointer-list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-29 12:32 +0000
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-11-29 18:58 -0800
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-29 13:52 +0100
Re: arranging items in a array with a sorted pointer-list Dolores Filandro <dolfiland8@gmail.com> - 2020-12-23 13:56 -0800
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-11-28 23:41 -0800
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-12-05 12:23 +0100
Re: arranging items in a array with a sorted pointer-list Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-12-06 16:27 -0800
Re: arranging items in a array with a sorted pointer-list David Brown <david.brown@hesbynett.no> - 2020-12-07 11:17 +0100
Re: arranging items in a array with a sorted pointer-list Kaz Kylheku <563-365-8930@kylheku.com> - 2020-11-29 18:34 +0000
Re: arranging items in a array with a sorted pointer-list Bonita Montero <Bonita.Montero@gmail.com> - 2020-11-29 21:23 +0100
Re: arranging items in a array with a sorted pointer-list Juha Nieminen <nospam@thanks.invalid> - 2020-11-30 09:10 +0000
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