Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site bbncc5.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!genrad!panda!talcott!harvard!bbnccv!bbncc5!keesan
From: keesan@bbncc5.UUCP (Morris M. Keesan)
Newsgroups: net.lang.c
Subject: Re: NULL ROUTINE POINTERS
Message-ID: <182@bbncc5.UUCP>
Date: Mon, 2-Dec-85 16:12:38 EST
Article-I.D.: bbncc5.182
Posted: Mon Dec  2 16:12:38 1985
Date-Received: Thu, 5-Dec-85 05:20:15 EST
References: <139@brl-tgr.ARPA>
Reply-To: keesan@bbncc5.UUCP (Morris M. Keesan)
Organization: Bolt Beranek and Newman, Cambridge, MA
Lines: 13
Keywords: typedef
Summary: use typedefs

The request was for a way to specify a null pointer to a function returning
short.  Doug Gwyn correctly responded with ((short (*)()) 0).  Note that the
form of the type specification is copied directly from section 8.7 of the
C Reference Manual in K&R (page 200), and therefore very safe.
For real readability, I as usual suggest the typedef method:

typedef short FS();     /* FS = Function returning Short */
typedef FS *PFS;        /* PFS = Pointer to Function returning Short */
#define NULLROUTINE ((PFS)0)    /* Isn't this much clearer? */
-- 
Morris M. Keesan
keesan@bbn-unix.ARPA
{decvax,ihnp4,etc.}!bbncca!keesan