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From: dmk@lanl-a.UUCP
Newsgroups: net.lang.c
Subject: Re: pointer -> long conversion
Message-ID: <10216@lanl-a.UUCP>
Date: Tue, 10-Jul-84 16:08:55 EDT
Article-I.D.: lanl-a.10216
Posted: Tue Jul 10 16:08:55 1984
Date-Received: Thu, 12-Jul-84 01:22:33 EDT
References: <831@bbncca.ARPA>
Organization: Los Alamos National Laboratory
Lines: 24

[]

     You should be able to get both types of conversion by saying
either
                    anytype *x;
                    long i;

                    i = (long)((int) x);  /* giving sign extension, or */
                    i = (long)((unsigned) x);  /* no sign extension */

but I'm not sure which one is better to use as the default when you say,

                    i = (long)x;

-- it depends on whether you think of an address as just a token (unsigned)
or an integer (signed).  Maybe it's best to just do whatever is the most
natural for the machine involved and if the user needs to force it one
way or the other then let him use a double typecast as above.

                               David Keaton
                               Los Alamos National Laboratory
                               ucbvax!lbl-csam!lanl-a!dmk
                               dmk@lanl.arpa