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From: DBrown@HI-MULTICS.ARPA
Newsgroups: net.lang.c
Subject: Re: pointer -> long conversion
Message-ID: <1950@sri-arpa.UUCP>
Date: Fri, 13-Jul-84 07:03:00 EDT
Article-I.D.: sri-arpa.1950
Posted: Fri Jul 13 07:03:00 1984
Date-Received: Tue, 17-Jul-84 06:22:25 EDT
Lines: 10


  Well, on a machine with 3-word pointers the operation refrains from
sign-extending so as not to accidentally create a long which points
somewhere else when converted back to a pointer.
  Probably the criteria shoul be "do what you must, but try to retain
corectness".  This implies not sign-extending (so as to avoid a
non-"pure" copy, but it also implies that a loss of significance should
be visible to the programmer somehow.  How you're going to do that I
wouldn't know.
 --dave (unix hack on a 'bun) brown