Re: Typecasting Pointers on a 64 bit System

From	James Kuyper <jameskuyper@verizon.net>
Newsgroups	comp.lang.c
Subject	Re: Typecasting Pointers on a 64 bit System
Date	2011-11-10 15:44 -0500
Organization	A noiseless patient Spider
Message-ID	<j9hd4k$79p$1@dont-email.me> (permalink)
References	<j9hbnp$13g$1@speranza.aioe.org> <877h37yazh.fsf@blp.benpfaff.org>

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On 11/10/2011 03:32 PM, Ben Pfaff wrote:
...
> Another way is to use (u)intptr_t from <stdint.h>, which is
> ordinarily defined as an integer type that is the same width as a
> pointer.

More accurately, it's defined to be big enough for the conversion to be
reversible. In practice, it's likely to be the same size, but that's not
part of the definition. It could easily be larger. If there's any
redundancy in the pointer representation, and the conversion removes
that redundancy, it could even be smaller.

Thread

Typecasting Pointers on a 64 bit System Quentin Pope <qp19433@hotmail.NOSPAM.com> - 2011-11-10 20:21 +0000
  Re: Typecasting Pointers on a 64 bit System Lauri Alanko <la@iki.fi> - 2011-11-10 20:29 +0000
    Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 20:51 +0000
      Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 20:58 +0000
      Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-10 16:08 -0500
        Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 21:35 +0000
          Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-10 17:18 -0500
            Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 23:14 +0000
              Re: Typecasting Pointers on a 64 bit System Richard Damon <news.x.richarddamon@xoxy.net> - 2011-11-10 19:36 -0500
  Re: Typecasting Pointers on a 64 bit System Ben Pfaff <blp@cs.stanford.edu> - 2011-11-10 12:32 -0800
    Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-10 15:44 -0500
    Re: Typecasting Pointers on a 64 bit System Keith Thompson <kst-u@mib.org> - 2011-11-10 12:58 -0800
      Re: Typecasting Pointers on a 64 bit System blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-11-17 15:53 +0000
  Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 20:45 +0000
    Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 21:00 +0000
  Re: Typecasting Pointers on a 64 bit System Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-11-10 15:14 -0700
  Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-11 11:22 +1300
    Re: Typecasting Pointers on a 64 bit System William Ahern <william@wilbur.25thandClement.com> - 2011-11-14 11:10 -0800
      Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 08:28 +1300
        Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 14:48 -0500
          Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 10:15 +1300
            Re: Typecasting Pointers on a 64 bit System jacob navia <jacob@spamsink.net> - 2011-11-14 22:18 +0100
              Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 10:26 +1300
            Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 16:46 -0500
              Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 10:58 +1300
                Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 17:15 -0500
                Re: Typecasting Pointers on a 64 bit System blp@cs.stanford.edu (Ben Pfaff) - 2011-11-14 14:18 -0800
                Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 11:29 +1300
                Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 18:14 -0500
                Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-14 23:01 +0000
                Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-16 10:39 +0200
                Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-16 20:18 +0000
                Re: Typecasting Pointers on a 64 bit System Fritz Wuehler <fritz@spamexpire-201111.rodent.frell.theremailer.net> - 2011-11-17 02:54 +0100
                Re: Typecasting Pointers on a 64 bit System pete <pfiland@mindspring.com> - 2011-11-16 21:29 -0500
                Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-17 02:31 +0000
                Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 14:31 +0200
                Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-17 02:44 +0000
                Re: Typecasting Pointers on a 64 bit System Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-11-16 21:33 -0700
                Re: Typecasting Pointers on a 64 bit System "io_x" <a@b.c.invalid> - 2011-11-17 04:01 +0100
                Re: Typecasting Pointers on a 64 bit System blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-11-17 15:46 +0000
                Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-17 18:48 +0000
                Re: Typecasting Pointers on a 64 bit System blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-11-18 14:48 +0000
                Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 14:37 +1300
                Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-16 10:23 +0200
                Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-16 06:53 -0500
                Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-16 11:15 -0500
                Re: Typecasting Pointers on a 64 bit System Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-11-16 17:08 +0000
                Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 15:09 +0200
                Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 14:24 +0200
                Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-18 10:08 -0500
                Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 17:52 +0200
            Re: Typecasting Pointers on a 64 bit System Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-11-14 15:45 -0700
  Re: Typecasting Pointers on a 64 bit System "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2011-11-10 15:19 -0800
    Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 23:41 +0000
      Re: Typecasting Pointers on a 64 bit System Keith Thompson <kst-u@mib.org> - 2011-11-10 20:48 -0800
      Re: Typecasting Pointers on a 64 bit System "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2011-11-14 03:39 -0800
        Re: Typecasting Pointers on a 64 bit System Lauri Alanko <la@iki.fi> - 2011-11-14 13:08 +0000
          Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 09:21 -0500
        Re: Typecasting Pointers on a 64 bit System Keith Thompson <kst-u@mib.org> - 2011-11-14 12:54 -0800

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