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Groups > comp.lang.c > #28931

Re: Macros

From James Kuyper <jameskuyper@verizon.net>
Newsgroups comp.lang.c
Subject Re: Macros
Date 2012-12-04 20:44 -0500
Organization A noiseless patient Spider
Message-ID <k9m8uf$2dk$1@dont-email.me> (permalink)
References (1 earlier) <5814fff9-1958-4e28-9708-ac8cc4ed760e@googlegroups.com> <k9g8c9$4sd$1@dont-email.me> <k9m2pm$vfu$2@blue-new.rahul.net> <50BE91DE.1060404@verizon.net> <k9m67h$j05$1@dont-email.me>

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On 12/04/2012 07:58 PM, Heikki Kallasjoki wrote:
> On 2012-12-05, James Kuyper <jameskuyper@verizon.net> wrote:
...
>> requirements imposed by the C standard. Code which does such things
>> might be hard to read and understand, but it has well-defined behavior
>> according to the C standard (unless some other feature of the program is
>> problematic).
> 
> There is, however, a slightly related rule in the standard about
> keywords as macro names; one that might even be the source of the
> (common?) belief stated above.
> 
>   The program shall not have any macros with names lexically identical
>   to keywords currently defined prior to the inclusion of [any standard]
>   header or when any macro defined in the header is expanded.
>   (N1570 7.1.2p4)
> 
> It's not an outright ban, but it is a limitation.

Yes, it is a limitation, but an avoidable one. With respect to my
earlier statement, violation of that limitation counts as "some other
feature of the program" that "is problematic".


-- 
James Kuyper

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Thread

Macros "BartC" <bc@freeuk.com> - 2012-12-02 17:53 +0000
  Re: Macros Öö Tiib <ootiib@hot.ee> - 2012-12-02 10:11 -0800
    Re: Macros James Kuyper <jameskuyper@verizon.net> - 2012-12-02 13:58 -0500
      Re: Macros Öö Tiib <ootiib@hot.ee> - 2012-12-02 13:37 -0800
      Re: Macros falk@rahul.net (Edward A. Falk) - 2012-12-04 23:59 +0000
        Re: Macros James Kuyper <jameskuyper@verizon.net> - 2012-12-04 19:14 -0500
          Re: Macros Heikki Kallasjoki <fis+usenet@zem.fi> - 2012-12-05 00:58 +0000
            Re: Macros James Kuyper <jameskuyper@verizon.net> - 2012-12-04 20:44 -0500
          Re: Macros Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-12-04 20:03 -0500
            Re: Macros James Kuyper <jameskuyper@verizon.net> - 2012-12-04 20:48 -0500
              Re: Macros Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-12-05 23:17 +0200
    Re: Macros "BartC" <bc@freeuk.com> - 2012-12-02 19:54 +0000
      Re: Macros Ian Collins <ian-news@hotmail.com> - 2012-12-03 09:14 +1300
        Re: Macros Greg Martin <greg@softsprocket.com> - 2012-12-02 12:38 -0800
          Re: Macros pete <pfiland@mindspring.com> - 2012-12-02 16:28 -0500
            Re: Macros Rui Maciel <rui.maciel@gmail.com> - 2012-12-02 22:59 +0000
        Re: Macros "BartC" <bc@freeuk.com> - 2012-12-02 21:11 +0000
      Re: Macros "BartC" <bc@freeuk.com> - 2012-12-02 22:55 +0000
        Re: Macros ImpalerCore <jadill33@gmail.com> - 2012-12-03 06:48 -0800
        Re: Macros Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-12-09 03:15 -0800
  Re: Macros Ian Collins <ian-news@hotmail.com> - 2012-12-03 07:19 +1300
  Re: Macros James Dow Allen <jdallen2000@yahoo.com> - 2012-12-02 10:29 -0800
  Re: Macros Richard Damon <news.x.richarddamon@xoxy.net> - 2012-12-02 15:52 -0500
  Re: Macros Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2012-12-02 22:56 -0700
  Re: Macros Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2012-12-02 22:56 -0700
    Re: Macros "BartC" <bc@freeuk.com> - 2012-12-03 12:20 +0000
      Re: Macros Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-12-03 17:01 +0000
  Re: Macros Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2012-12-02 22:57 -0700
  Re: Macros "Heinrich Wolf" <invalid@invalid.invalid> - 2012-12-03 09:48 +0100
    Re: Macros Öö Tiib <ootiib@hot.ee> - 2012-12-03 07:34 -0800

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