Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
| Message-ID | <4DEA0DB0.5BE6@mindspring.com> (permalink) |
|---|---|
| Date | 2011-06-04 06:49 -0400 |
| From | pete <pfiland@mindspring.com> |
| Organization | PF |
| Newsgroups | comp.lang.c |
| Subject | Re: offsetof() Macro Attempt |
| References | <isb79p$oao$1@dont-email.me> <4DE92C83.824@mindspring.com> <iscl9q$dgc$1@dont-email.me> |
Shao Miller wrote:
>
> On 6/3/2011 1:48 PM, pete wrote:
> > Shao Miller wrote:
> >
> >> So let's please go on to:
> >>
> >> char ** helper;
> >>
> >> enum foo {
> >> bar = *helper + 1 - *helper
> >> };
> >>
> >> int main(void) {
> >> return 0;
> >> }
> >
> > That one has the same problem as
> >
> > int main(void)
> > {
> > int x;
> >
> > x - x;
> > return 0;
> > }
> >
>
> In your example, 'x' is not initialized, and I agree that such is a
> concern. In the example just above your example, 'helper' is at file
> scope[6.9.2p2]. What is the problem, exactly?
I read it wrong. Sorry about that.
But, if (helper) is equal to NULL,
which I believe is the case,
then (*helper) is undefined.
But even if (*helper) was defined,
then (*helper + 1 - *helper) is still not a constant expression
and the compiler that I'm using,
won't compile the above program.
--
pete
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-03 13:57 -0400
Re: offsetof() Macro Attempt Billy Mays <noway@nohow.com> - 2011-06-03 13:59 -0400
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-03 14:33 -0400
Re: offsetof() Macro Attempt Noob <root@127.0.0.1> - 2011-06-08 15:03 +0200
Re: offsetof() Macro Attempt pete <pfiland@mindspring.com> - 2011-06-03 14:48 -0400
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-04 02:02 -0500
Re: offsetof() Macro Attempt pete <pfiland@mindspring.com> - 2011-06-04 06:49 -0400
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-04 09:32 -0500
Re: offsetof() Macro Attempt pete <pfiland@mindspring.com> - 2011-06-04 12:55 -0400
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-04 13:24 -0500
Re: offsetof() Macro Attempt pete <pfiland@mindspring.com> - 2011-06-04 14:56 -0400
Re: offsetof() Macro Attempt pete <pfiland@mindspring.com> - 2011-06-04 15:38 -0400
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-04 18:25 -0500
Re: offsetof() Macro Attempt pete <pfiland@mindspring.com> - 2011-06-05 07:10 -0400
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-03 13:39 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-03 19:58 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-04 01:57 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-04 05:22 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-04 10:16 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-04 23:03 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-05 02:24 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-06 08:08 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-06 13:26 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-08 12:34 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-08 15:07 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-08 15:19 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-14 14:53 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-14 14:52 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-14 16:24 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-15 06:44 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-15 10:40 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-19 13:48 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-19 14:57 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-23 00:52 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-23 12:34 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-27 10:03 -0700
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-07-01 10:03 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-07-03 14:33 -0700
Re: offsetof() Macro Attempt Michael Press <rubrum@pacbell.net> - 2011-06-18 21:17 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-27 10:13 -0700
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-04 14:05 -0500
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-05 02:44 -0700
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-06 17:58 -0500
Re: offsetof() Macro Attempt Harald van Dijk <truedfx@gmail.com> - 2011-06-06 15:37 -0700
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-06 18:58 -0500
Re: offsetof() Macro Attempt Andrey Tarasevich <andreytarasevich@hotmail.com> - 2011-06-03 17:15 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-03 20:20 -0700
Re: offsetof() Macro Attempt Shao Miller <sha0.miller@gmail.com> - 2011-06-04 12:50 -0500
Re: offsetof() Macro Attempt Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-03 21:43 -0400
Re: offsetof() Macro Attempt Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-03 21:54 -0400
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-03 20:36 -0700
Re: offsetof() Macro Attempt Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-03 19:46 -0700
csiph-web