Re: Code review requested

From	James Kuyper <jameskuyper@verizon.net>
Newsgroups	comp.lang.c
Subject	Re: Code review requested
Date	2012-09-20 18:48 -0400
Organization	A noiseless patient Spider
Message-ID	<505B9D45.1040505@verizon.net> (permalink)
References	(3 earlier) <ac18hdFivfbU2@mid.individual.net> <dfaf663b-6b33-47fa-81c8-02948badcd27@googlegroups.com> <fd4f5b6a-e495-4de6-b886-9351a5e99514@r7g2000yqa.googlegroups.com> <505B8618.7020003@verizon.net> <c4939e6f-e921-49a3-bdb3-576460e6eb1f@u15g2000yql.googlegroups.com>

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On 09/20/2012 05:52 PM, ImpalerCore wrote:
> On Sep 20, 5:09 pm, James Kuyper <jameskuy...@verizon.net> wrote:
...
>> It's not just integer types you need to worry about, (bool)0.5 and
>> (bool)&object won't work properly, either.
> 
> I have not experienced code that did those type conversions, so I
> didn't document it at the time.  Have you happened to experience
> either of those type conversions in the wild?

My project is still governed by a 1997 agreement with our client which
requires us to write code which "conforms" to C90 plus the two Technical
Corrigenda. Technically, that's not exactly a restrictive requirement -
"War and Peace" qualifies as conforming C code - but I try to follow the
spirit of the requirement, even if it was incorrectly worded.

I long ago adopted a policy of avoiding defining variables whose sole
job is to keep track of whether or not a condition is true; I prefer
re-stating the condition - it often leads to clearer code, and generally
does the right thing when the condition involves variables whose values
have changed since the last time it was evaluated. If the condition does
not actually need to be re-evaluated, most modern compilers can be
counted on to detect that fact (more reliably than I can), and use an
unnamed temporary for the same purpose that a named boolean variable
would have been used for. Therefore, I think this is a feature I won't
make much use of, even when I can do so.

However, if I ever do use _Bool, implicit conversions from pointer
values to _Bool stand a very good chance of being involved. I often
write if(p) rather than if(p!=NULL), which is essentially the same idea.

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Code review requested bart.vandewoestyne@gmail.com - 2012-09-20 02:27 -0700
  Re: Code review requested Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-09-20 11:44 +0100
    Re: Code review requested Bart Vandewoestyne <bart.vandewoestyne@gmail.com> - 2012-09-20 08:30 -0700
      Re: Code review requested Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-09-20 16:48 +0100
        Re: Code review requested Bart Vandewoestyne <bart.vandewoestyne@gmail.com> - 2012-09-20 13:38 -0700
        Re: Code review requested Bart Vandewoestyne <MyFirstName.MyLastName@telenet.be> - 2012-09-20 23:00 +0200
      Re: Code review requested ImpalerCore <jadill33@gmail.com> - 2012-09-20 09:02 -0700
        Re: Code review requested Bart Vandewoestyne <MyFirstName.MyLastName@telenet.be> - 2012-09-20 23:13 +0200
          Re: Code review requested Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-09-22 22:16 +0000
        Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-20 16:54 -0700
          Re: Code review requested ImpalerCore <jadill33@gmail.com> - 2012-09-21 12:10 -0700
          Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-23 12:47 +0200
            Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-23 03:54 -0700
            Re: Code review requested "BartC" <bc@freeuk.com> - 2012-09-23 14:07 +0100
            Re: Code review requested Öö Tiib <ootiib@hot.ee> - 2012-09-23 15:13 -0700
              Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-23 15:39 -0700
                Re: Code review requested Ian Collins <ian-news@hotmail.com> - 2012-09-24 10:46 +1200
                Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-23 17:30 -0700
                Re: Code review requested Ian Collins <ian-news@hotmail.com> - 2012-09-24 14:05 +1200
                Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-24 00:26 -0700
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-24 11:03 +0200
                Re: Code review requested Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-09-24 09:16 -0700
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-24 18:25 +0200
                Re: Code review requested Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-09-25 04:49 -0700
                Re: Code review requested Ian Collins <ian-news@hotmail.com> - 2012-09-25 07:41 +1200
                Re: Code review requested James Kuyper <jameskuyper@verizon.net> - 2012-09-24 15:50 -0400
                Re: Code review requested Ian Collins <ian-news@hotmail.com> - 2012-09-25 09:30 +1200
                Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-24 12:45 -0700
                Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-24 16:10 -0700
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-25 09:02 +0200
                Re: Code review requested "BartC" <bc@freeuk.com> - 2012-09-24 10:47 +0100
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-24 13:41 +0200
                Re: Code review requested "BartC" <bc@freeuk.com> - 2012-09-24 13:40 +0100
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-24 15:31 +0200
                Re: Code review requested Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-09-24 15:14 +0100
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-24 17:40 +0200
                Re: Code review requested Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-09-24 18:11 +0100
                Re: Code review requested Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-09-24 11:13 -0700
                Re: Code review requested Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-09-24 20:52 +0100
                Re: Code review requested "BartC" <bc@freeuk.com> - 2012-09-24 16:22 +0100
                Re: Code review requested Rui Maciel <rui.maciel@gmail.com> - 2012-09-24 16:46 +0100
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-24 18:22 +0200
                Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-24 12:52 -0700
                Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-24 13:59 -0700
                Re: Code review requested David Brown <david@westcontrol.removethisbit.com> - 2012-09-24 08:43 +0200
                Re: Code review requested Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-09-23 16:03 -0700
                Re: Code review requested Ian Collins <ian-news@hotmail.com> - 2012-09-24 11:10 +1200
        Re: Code review requested Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-09-24 00:49 -0700
      Re: Code review requested Ian Collins <ian-news@hotmail.com> - 2012-09-21 07:19 +1200
        Re: Code review requested Bart Vandewoestyne <bart.vandewoestyne@gmail.com> - 2012-09-20 13:29 -0700
          Re: Code review requested ImpalerCore <jadill33@gmail.com> - 2012-09-20 13:48 -0700
            Re: Code review requested James Kuyper <jameskuyper@verizon.net> - 2012-09-20 17:09 -0400
              Re: Code review requested ImpalerCore <jadill33@gmail.com> - 2012-09-20 14:52 -0700
                Re: Code review requested James Kuyper <jameskuyper@verizon.net> - 2012-09-20 18:48 -0400
                Re: Code review requested Francois Grieu <fgrieu@gmail.com> - 2012-09-21 09:53 +0200
                Re: Code review requested Walter Banks <walter@bytecraft.com> - 2012-10-01 07:43 -0400
                Re: Code review requested ImpalerCore <jadill33@gmail.com> - 2012-09-21 08:55 -0700
          Re: Code review requested Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-09-20 16:59 -0400
            Re: Code review requested hormelfree@gmail.com - 2012-09-20 17:39 -0700
          Re: Code review requested Rui Maciel <rui.maciel@gmail.com> - 2012-09-20 23:23 +0100
            Re: Code review requested Keith Thompson <kst-u@mib.org> - 2012-09-20 16:48 -0700

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