Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
| Newsgroups | comp.lang.c |
|---|---|
| Date | 2015-11-15 12:56 -0800 |
| References | (8 earlier) <edc97cb1-60df-45a6-b81e-9e1794244119@googlegroups.com> <876113v9b8.fsf@bsb.me.uk> <97e66a45-03e0-40ea-96fc-0cbeef3b1319@googlegroups.com> <87io53tis5.fsf@bsb.me.uk> <lnk2pjm7na.fsf@kst-u.example.com> |
| Message-ID | <45becf4f-4a4c-487b-bf9d-e160b96608cd@googlegroups.com> (permalink) |
| Subject | Re: Forward declarations |
| From | "Rick C. Hodgin" <rick.c.hodgin@gmail.com> |
On Sunday, November 15, 2015 at 1:37:09 PM UTC-5, Keith Thompson wrote:
> Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> [...]
> > That's not a function declaration -- It's the declaration of a pointer.
> > But even if it were of function type, it's a parameter -- a new "thing"
> > (instantiated on every call) not a second declaration of something
> > else. (I have to say "thing", because C does not have function objects
> > or function values so there is no terminology to talk about functions as
> > parameters.)
> [...]
>
> As you say, C does not have parameters of function type.
Whatever you call them "in C speak," this is what I mean (line 03):
01: #include <stdio.h>
02:
03: int foo(char *s, int n, int ferrah(char* s, int n))
04: {
05: if (*s == ' ') return(foo(s+1, n, ferrah));
06: else return(ferrah(s+1, n));
07: }
08:
09: int bas(char *s, int n)
10: {
11: if (*s == 0) return(n);
12: else if (*s != ' ') return(bas(s+1, n));
13: else return(foo(s, n, bas));
14: }
15:
16: int main(int argc, char* argv[])
17: {
18: printf("%d\n", bas("Rick test", 0));
19: }
I am referring to this part specifically:
int foo(char *s, int n, int ferrah(char* s, int n))
^^^^^^^^^^^^^^^^^^^^^^^^^^
Here we see:
int ferrah(char* s, int n)
Except for that fact that it doesn't have a trailing semicolon, it
is a function declaration. It defines the return type, the name,
the parameters, and it is available for use within the function,
albeit as a function pointer, but that is an internal issue and
not an external one.
> If it did,
> since all arguments are passed by value, it would have to be possible to
> pass a function value in a call. It's very difficult to say what that
> would mean unless you made some major changes to C semantics.
I wish I wasn't in your killfile on this group. It would be nice
to hear your response on this.
Best regards,
Rick C. Hodgin
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-10 14:20 -0800
Re: Forward declarations jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-10 23:38 +0100
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-10 15:00 -0800
Re: Forward declarations Ian Collins <ian-news@hotmail.com> - 2015-11-11 12:24 +1300
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-10 15:53 -0800
Re: Forward declarations gazelle@shell.xmission.com (Kenny McCormack) - 2015-11-11 00:01 +0000
Re: Forward declarations Ian Collins <ian-news@hotmail.com> - 2015-11-11 13:46 +1300
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-10 21:05 -0800
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-11 00:21 +0000
Re: Forward declarations Lőrinczy Zsigmond <zsiga@nospam.for.me> - 2015-11-11 10:16 +0100
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-11 07:19 -0800
Re: Forward declarations David Brown <david.brown@hesbynett.no> - 2015-11-11 15:40 +0100
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-11 07:21 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-11 07:23 -0800
Re: Forward declarations David Brown <david.brown@hesbynett.no> - 2015-11-11 16:29 +0100
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-11 07:31 -0800
Re: Forward declarations Nick Bowler <nbowler@draconx.ca> - 2015-11-13 18:20 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-13 10:39 -0800
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-13 19:40 +0000
Re: Forward declarations Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-14 11:42 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-14 12:32 -0800
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 00:15 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-14 16:34 -0800
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 01:54 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-14 18:00 -0800
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 02:13 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-14 18:26 -0800
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 02:34 +0000
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-15 11:11 +0000
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 02:36 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-14 19:25 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-14 19:37 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-14 20:11 -0800
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 10:36 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 06:16 -0800
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-15 14:44 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 09:41 -0800
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 18:26 +0000
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-15 18:42 +0000
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 18:53 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 12:58 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 12:49 -0800
Re: Forward declarations Ian Collins <ian-news@hotmail.com> - 2015-11-16 10:01 +1300
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-15 14:54 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 09:53 -0800
Re: Forward declarations Keith Thompson <kst-u@mib.org> - 2015-11-15 10:36 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 12:56 -0800
Re: Forward declarations Ian Collins <ian-news@hotmail.com> - 2015-11-16 10:04 +1300
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 13:11 -0800
Re: Forward declarations Ian Collins <ian-news@hotmail.com> - 2015-11-16 10:25 +1300
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 13:37 -0800
Re: Forward declarations Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-15 13:13 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 13:16 -0800
Re: Forward declarations David Brown <david.brown@hesbynett.no> - 2015-11-16 00:23 +0100
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 16:20 -0800
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-16 00:47 +0000
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-16 01:28 +0000
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-16 01:57 +0000
Re: Forward declarations Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-15 21:15 -0500
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-16 11:05 +0000
Re: Forward declarations Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-16 10:18 -0500
Re: Forward declarations Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 06:44 +0000
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-16 11:26 +0000
Re: Forward declarations David Brown <david.brown@hesbynett.no> - 2015-11-16 12:43 +0100
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-16 12:20 +0000
Re: Forward declarations David Brown <david.brown@hesbynett.no> - 2015-11-16 14:38 +0100
Re: Forward declarations Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-16 13:26 +0000
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-16 13:53 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-15 18:12 -0800
Re: Forward declarations pa@see.signature.invalid (Pierre Asselin) - 2015-11-12 01:54 +0000
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-12 02:08 -0800
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-12 09:58 +0000
Re: Forward declarations John Bode <jfbode1029@gmail.com> - 2015-11-17 14:46 -0800
Re: Forward declarations "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-17 14:59 -0800
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-17 23:35 +0000
Re: Forward declarations BartC <bc@freeuk.com> - 2015-11-17 23:40 +0000
Re: Forward declarations Keith Thompson <kst-u@mib.org> - 2015-11-17 19:48 -0800
Re: Forward declarations glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-18 01:04 +0000
csiph-web