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| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: When did K&R function declarations become obsolete? |
| Date | 2011-12-12 11:59 -0800 |
| Organization | None to speak of |
| Message-ID | <lnr5098stx.fsf@nuthaus.mib.org> (permalink) |
| References | <jc082n$27s4$1@colin.muc.de> <jc2e1m$jdl$1@dont-email.me> <jc4qb9$412$1@colin.muc.de> <jc4t4a$boi$1@dont-email.me> |
James Kuyper <jameskuyper@verizon.net> writes:
> On 12/12/2011 06:59 AM, Alan Mackenzie wrote:
>> James Kuyper <jameskuyper@verizon.net> wrote:
[...]
>>> Also, there's still one point where non-prototype function declarations
>>> are useful. Try to declare a prototype for a function taking, as an
>>> argument, a pointer to a function of the SAME type. You'll quickly
>>> discover that the declaration recurses infinitely.
[...]
>>> Somewhere along the way, you have to terminate it. There's a number of
>>> ways to terminate it, but the simplest is to use a non-prototype
>>> declaration that leaves the number and type of the parameters
>>> unspecified.
>>
>> Won't the judicious use of "void *" for the parameter do the trick?
>
> No, void* and function pointer types are not compatible.
But the language guarantees that converting any function pointer
to another pointer-to-function type and back again yields the original
pointer. That means you can use *any* pointer-to-function type (the
simplest is "void (*)(void)") as a generic pointer-to-function type.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Will write code for food.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-10 18:23 +0000
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-10 18:41 +0000
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-10 10:40 -0800
Re: When did K&R function declarations become obsolete? Ian Collins <ian-news@hotmail.com> - 2011-12-11 07:49 +1300
Re: When did K&R function declarations become obsolete? Ben Pfaff <blp@cs.stanford.edu> - 2011-12-10 10:49 -0800
Re: When did K&R function declarations become obsolete? jt@toerring.de (Jens Thoms Toerring) - 2011-12-10 21:16 +0000
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-12 11:29 +0000
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-12 03:49 -0800
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-12 15:04 +0000
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-13 10:42 +0000
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-13 13:58 +0000
Re: When did K&R function declarations become obsolete? "Scott Fluhrer" <sfluhrer@ix.netcom.com> - 2011-12-13 10:17 -0500
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-13 12:04 -0600
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-13 18:17 +0000
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-13 15:17 -0600
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-13 21:46 +0000
Re: When did K&R function declarations become obsolete? Seebs <usenet-nospam@seebs.net> - 2011-12-13 22:04 +0000
Re: When did K&R function declarations become obsolete? jgk@panix.com (Joe keane) - 2011-12-13 23:07 +0000
Re: When did K&R function declarations become obsolete? Seebs <usenet-nospam@seebs.net> - 2011-12-13 23:23 +0000
Re: When did K&R function declarations become obsolete? Kaz Kylheku <kaz@kylheku.com> - 2011-12-14 00:26 +0000
Re: When did K&R function declarations become obsolete? blp@cs.stanford.edu (Ben Pfaff) - 2011-12-13 15:22 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-13 15:27 -0800
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-14 09:33 +0000
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-13 19:49 +0000
Re: When did K&R function declarations become obsolete? "Scott Fluhrer" <sfluhrer@ix.netcom.com> - 2011-12-13 14:54 -0500
Re: When did K&R function declarations become obsolete? luser- -droog <mijoryx@yahoo.com> - 2011-12-20 02:28 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-10 13:48 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-10 21:48 -0800
Re: When did K&R function declarations become obsolete? Ralph Spitzner <rasp@spitzner.org> - 2011-12-11 04:16 +0100
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-10 21:54 -0800
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-10 22:27 -0600
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-11 12:56 +0000
Re: When did K&R function declarations become obsolete? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-11 09:11 -0500
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-11 21:40 -0600
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 00:05 -0800
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-12 15:00 +0000
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-12 07:18 -0800
Re: When did K&R function declarations become obsolete? Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-13 00:55 -0800
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-13 07:50 -0800
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-12 11:15 -0600
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-12 11:17 -0600
Re: When did K&R function declarations become obsolete? jgk@panix.com (Joe keane) - 2011-12-12 21:57 +0000
Re: When did K&R function declarations become obsolete? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-12 18:15 -0500
Re: When did K&R function declarations become obsolete? ralph <nt_consulting64@yahoo.net> - 2011-12-11 15:10 -0600
Re: When did K&R function declarations become obsolete? James Kuyper <jameskuyper@verizon.net> - 2011-12-11 09:17 -0500
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-11 06:53 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 00:08 -0800
Re: When did K&R function declarations become obsolete? Alan Mackenzie <acm@muc.de> - 2011-12-12 11:59 +0000
Re: When did K&R function declarations become obsolete? James Kuyper <jameskuyper@verizon.net> - 2011-12-12 07:47 -0500
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 11:59 -0800
Re: When did K&R function declarations become obsolete? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-12 18:17 -0500
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-12 15:43 -0800
Re: When did K&R function declarations become obsolete? André Gillibert <MetaEntropy.removeThis@gmail.com> - 2011-12-12 13:49 +0100
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-12 05:25 -0800
Re: When did K&R function declarations become obsolete? André Gillibert <MetaEntropy.removeThis@gmail.com> - 2011-12-12 14:35 +0100
Re: When did K&R function declarations become obsolete? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-12 15:21 +0000
Re: When did K&R function declarations become obsolete? Jonathan Leffler <jleffler@earthlink.net> - 2011-12-13 22:19 -0800
Re: When did K&R function declarations become obsolete? Keith Thompson <kst-u@mib.org> - 2011-12-14 02:54 -0800
Re: When did K&R function declarations become obsolete? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-14 13:17 -0800
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