Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 8/23/84; site ucbcad.UUCP
Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!decvax!ucbvax!ucbcad!faustus
From: faustus@ucbcad.UUCP (Wayne A. Christopher)
Newsgroups: net.lang.c
Subject: Re: Re:  Casting call
Message-ID: <4@ucbcad.UUCP>
Date: Fri, 24-May-85 03:22:46 EDT
Article-I.D.: ucbcad.4
Posted: Fri May 24 03:22:46 1985
Date-Received: Sun, 26-May-85 00:42:25 EDT
References: <10946@brl-tgr.ARPA>
Organization: UC Berkeley CAD Group, Berkeley, CA
Lines: 15

> >> #define FREE(ptr)	{  free((char *) ptr); ptr = (typeof ptr) NULL;  }
> 
> > ... If we were using ANSI C, ...
> 
> One doesn't even need any of the new ANSI C features:
> 
> #define	FREE( ptr )	( free( (char *)ptr ), ptr = NULL )
> 
> since one can always assign 0 (NULL) to any pointer type.

The original problem was that NULL is a valid address under 4.{2,3},
but (char *) -1 isn't. This is, of course, dependent on 4.2 and
the VAX.

	Wayne