Re: int * vs char *

From	Dr Nick <3-nospam@temporary-address.org.uk>
Newsgroups	comp.lang.c
Subject	Re: int * vs char *
Date	2011-07-05 07:45 +0100
Message-ID	<87ei25ns3h.fsf@temporary-address.org.uk> (permalink)
References	(4 earlier) <yp6dnQAIK81zT5_TnZ2dnUVZ_qWdnZ2d@posted.internetamerica> <iu10vs$76k$1@dont-email.me> <96ifliFmo4U6@mid.individual.net> <iu26ni$rjm$1@dont-email.me> <iutd6j$e7o$1@dont-email.me>

Show all headers | View raw

Shao Miller <sha0.miller@gmail.com> writes:

> On 6/24/2011 10:24, Stephen Sprunk wrote:
>>>
>>> The C++ standard replaces the C strchr() with two overloads:
>>>
>>> const char* strchr(const char* s, int c);
>>>        char* strchr(      char* s, int c);
>>
>> Compare to the only option C provides:
>>
>> char *strchr(const char *s, int c);
>>
>> This takes a const or non-const argument but always returns a non-const
>> pointer; the potential loss of const-ness invites bugs.  Thanks to
>> overloading, the C++ version is able to return a pointer that matches
>> the const-ness of its argument, preventing bugs.
>
> A fellow yesterday advised of another strategy, using a GCC extension:
>
>   #define strchr(s, c) ((__typeof__(s)) (strchr((s), (c)))
>
> That is, casting the result to the original type of 's'.  Heheheh.

That's either very neat or unutterably ghastly.  I'm still thinking
about which it is.
-- 
Online waterways route planner            | http://canalplan.eu
Plan trips, see photos, check facilities  | http://canalplan.org.uk

Thread

int * vs char * yugandhar <nospam@nospam.com> - 2011-06-21 21:49 +0000
  Re: int * vs char * John Gordon <gordon@panix.com> - 2011-06-21 21:58 +0000
    Re: int * vs char * "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-06-21 20:25 -0400
  Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-22 09:59 +1200
  Re: int * vs char * Ike Naar <ike@sverige.freeshell.org> - 2011-06-21 22:18 +0000
  Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-06-21 18:34 -0500
  Re: int * vs char * Keith Thompson <kst-u@mib.org> - 2011-06-21 15:42 -0700
    Re: int * vs char * Noob <root@127.0.0.1> - 2011-06-22 10:28 +0200
      Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-06-22 05:23 -0500
      Re: int * vs char * James Kuyper <jameskuyper@verizon.net> - 2011-06-22 06:25 -0400
        Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-23 07:56 +1200
          Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-06-22 18:12 -0500
            Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-23 10:23 +1200
            Re: int * vs char * Keith Thompson <kst-u@mib.org> - 2011-06-22 17:23 -0700
              Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-23 12:54 +1200
                Re: int * vs char * Keith Thompson <kst-u@mib.org> - 2011-06-22 18:18 -0700
                Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-23 13:23 +1200
              Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-06-24 15:39 -0400
                Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-25 09:28 +1200
                Re: int * vs char * Keith Thompson <kst-u@mib.org> - 2011-06-24 14:58 -0700
                Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-25 10:06 +1200
                Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-06-26 15:44 -0500
                Re: int * vs char * Keith Thompson <kst-u@mib.org> - 2011-06-24 14:29 -0700
                Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-25 09:36 +1200
                Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-06-26 16:24 -0500
                Re: int * vs char * Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-25 08:39 -0700
            Re: int * vs char * gordonb.5qick@burditt.org (Gordon Burditt) - 2011-06-22 23:49 -0500
      Re: int * vs char * Stephen Sprunk <stephen@sprunk.org> - 2011-06-22 11:31 -0500
        Re: int * vs char * gordonb.idn9q@burditt.org (Gordon Burditt) - 2011-06-23 00:45 -0500
          Re: int * vs char * pacman@kosh.dhis.org (Alan Curry) - 2011-06-23 20:08 +0000
          Re: int * vs char * Stephen Sprunk <stephen@sprunk.org> - 2011-06-23 22:40 -0500
            Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-24 15:46 +1200
              Re: int * vs char * Stephen Sprunk <stephen@sprunk.org> - 2011-06-24 09:24 -0500
                Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-07-04 18:00 -0400
                Re: int * vs char * Dr Nick <3-nospam@temporary-address.org.uk> - 2011-07-05 07:45 +0100
                Re: int * vs char * Harald van Dĳk <truedfx@gmail.com> - 2011-07-05 10:39 -0700
                Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-07-05 14:09 -0400
                Re: int * vs char * Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-07-07 21:56 +0300
                Re: int * vs char * Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-07-08 02:46 +0300
                Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-07-07 22:26 -0400
                Re: int * vs char * Stephen Sprunk <stephen@sprunk.org> - 2011-07-07 22:41 -0500
                Re: int * vs char * "Joel C. Salomon" <joelcsalomon@gmail.com> - 2011-07-05 15:32 -0400
                Re: int * vs char * Shao Miller <sha0.miller@gmail.com> - 2011-07-06 09:58 -0400
      Re: int * vs char * Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-23 01:02 -0700
        Re: int * vs char * Ian Collins <ian-news@hotmail.com> - 2011-06-23 20:11 +1200
          Re: int * vs char * Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-25 09:23 -0700
            Re: int * vs char * Keith Thompson <kst-u@mib.org> - 2011-06-25 12:37 -0700
              Re: int * vs char * Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-27 11:40 -0700
  Re: int * vs char * Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-21 21:46 -0400
    Re: int * vs char * "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-06-22 10:06 -0700
      Re: int * vs char * Keith Thompson <kst-u@mib.org> - 2011-06-22 13:06 -0700
        Re: int * vs char * "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-06-22 13:29 -0700
  Re: int * vs char * Stephen Sprunk <stephen@sprunk.org> - 2011-06-21 21:29 -0500

csiph-web