Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!ames!pasteur!ucbvax!tut.cis.ohio-state.edu!rutgers!att!chinet!john
From: john@chinet.chi.il.us (John Mundt)
Newsgroups: comp.lang.c
Subject: Re: Typecast of Pointers to Functions
Message-ID: <8062@chinet.chi.il.us>
Date: 29 Mar 89 15:30:00 GMT
References: <7689@killer.Dallas.TX.US>
Reply-To: john@chinet.chi.il.us (John Mundt)
Distribution: usa
Organization: Chinet - Public Access Unix
Lines: 28

In article <7689@killer.Dallas.TX.US> brian@killer.DALLAS.TX.US (Brian Pellerin) writes:
>I am looking for an equivalent way to specify a typecast of a pointer to 
>a function other than using typedef.  For Example:
>
>  typedef int (*FCN_PTR) ();
>  FCN_PTR     fcn_ptr1;
>  int         (*fcn_ptr2) (); 
>
>  fcn_ptr1 = (FCN_PTR) NULL;  /* Typecast using typedef */
>  fcn_ptr2 = (???????) NULL;  /* Do Not Use the typedef.  What Goes Here? */

What you need is the following cast

	fcn_ptr2 = (int (*)()) NULL;

If you look at your typedef, you'll see that this is virtually the same thing
with the name taken out and with the casting parentheses put around the 
entire thing.

Why not use 0 instead of NULL, too?



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John Mundt   Teachers' Aide, Inc.  P.O. Box 1666  Highland Park, IL
john@chinet.chi.il.us
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