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Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary?

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From Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups comp.lang.c++
Subject Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary?
Date Sun, 01 Dec 2024 20:57:05 -0800
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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

> David Brown <david.brown@hesbynett.no> writes:
> [...]
>
>> I don't know if there are any real-world implementations (of C or
>> C++) with more than one representation for null pointers, but
>> null pointers are somewhat special.  "if (x == y)" compares for
>> equality of two values, unless one of these is a pointer and the
>> other is a null pointer constant - then the comparison is more of
>> a classification, checking if the pointer is in the set of null
>> pointer values.
>
> [...]
>
> I'd say that a null pointer of a given type is a single *value*
> that may or may not have multiple *representations*.  [...]

That's a point of view, but it isn't anything more than that.  The
abstract value space of pointers is not well defined.  By contrast,
the abstract value space of an integer data type, such as int, is
well defined.  Two pointers can compare equal and yet not be the
same pointer.  There is no reason the same relationship can't
hold for null pointers.  (In both of the last two sentences the
word "pointer" may be read as "pointer value".)

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Is EXIT_SUCCESS/EXIT_FAILURE necessary? wij <wyniijj5@gmail.com> - 2024-11-20 11:02 +0800
  Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Paavo Helde <eesnimi@osa.pri.ee> - 2024-11-20 09:22 +0200
    Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastartdlyHQ.org - 2024-11-20 08:27 +0000
      Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-20 13:47 +0000
        Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastartdlyHQ.org - 2024-11-20 15:05 +0000
          Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-20 15:45 +0000
            Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastartdlyHQ.org - 2024-11-20 16:41 +0000
    Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-20 13:37 -0800
      Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-20 22:11 +0000
        Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-20 14:33 -0800
          Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-20 23:03 +0000
            Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-20 15:57 -0800
          Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-20 15:58 -0800
            Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-21 13:43 +0000
              Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastartdlyHQ.org - 2024-11-21 16:07 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-21 17:55 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? David Brown <david.brown@hesbynett.no> - 2024-11-22 09:30 +0100
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Ross Finlayson <ross.a.finlayson@gmail.com> - 2024-11-22 11:10 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@dastardlyhq.com - 2024-11-23 11:36 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-11-22 12:26 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-22 12:49 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-22 23:26 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? David Brown <david.brown@hesbynett.no> - 2024-11-23 13:07 +0100
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-11-25 13:55 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-12-01 20:57 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastartdlyHQ.org - 2024-11-22 09:55 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-11-26 04:21 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-22 11:57 -0500
              Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-22 11:31 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-11-22 12:36 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-22 16:53 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? wij <wyniijj5@gmail.com> - 2024-11-24 12:57 +0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-11-25 14:03 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? wij <wyniijj5@gmail.com> - 2024-11-26 12:21 +0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? wij <wyniijj5@gmail.com> - 2024-11-27 16:23 +0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastartdlyHQ.org - 2024-11-27 08:26 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? wij <wyniijj5@gmail.com> - 2024-11-27 18:48 +0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Paavo Helde <eesnimi@osa.pri.ee> - 2024-11-27 15:39 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-27 13:54 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-27 17:24 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-27 16:12 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Richard Damon <richard@damon-family.org> - 2024-11-27 13:00 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-28 08:23 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-28 15:06 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Richard Damon <richard@damon-family.org> - 2024-11-28 08:08 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-27 14:58 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Ross Finlayson <ross.a.finlayson@gmail.com> - 2024-11-27 19:46 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-28 08:26 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Paavo Helde <eesnimi@osa.pri.ee> - 2024-11-28 13:03 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Ralf Fassel <ralfixx@gmx.de> - 2024-11-28 12:15 +0100
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Paavo Helde <eesnimi@osa.pri.ee> - 2024-11-28 13:36 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Ralf Fassel <ralfixx@gmx.de> - 2024-11-28 14:12 +0100
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Richard Damon <richard@damon-family.org> - 2024-11-28 07:50 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-28 15:19 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-28 15:12 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-28 17:36 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? David Brown <david.brown@hesbynett.no> - 2024-11-28 16:43 +0100
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-28 15:59 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Ross Finlayson <ross.a.finlayson@gmail.com> - 2024-11-28 10:19 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Paavo Helde <eesnimi@osa.pri.ee> - 2024-11-28 22:41 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-29 00:21 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Paavo Helde <eesnimi@osa.pri.ee> - 2024-11-29 00:59 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-29 01:20 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-28 17:18 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Paavo Helde <eesnimi@osa.pri.ee> - 2024-11-27 19:01 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-28 08:22 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Ross Finlayson <ross.a.finlayson@gmail.com> - 2024-11-27 11:00 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-27 14:57 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Muttley@DastardlyHQ.org - 2024-11-27 13:52 +0000
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-27 14:54 -0500
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-28 15:27 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-27 15:30 +0200
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-11-28 18:32 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-11-25 14:00 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-25 14:15 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-12-01 21:00 -0800
                Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-11-26 04:26 -0800
          Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-20 23:20 -0500
        Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Ross Finlayson <ross.a.finlayson@gmail.com> - 2024-11-20 17:32 -0800
          Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? red floyd <no.spam.here@its.invalid> - 2024-11-20 22:56 -0800
            Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-21 13:52 +0000
          Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-21 13:51 +0000
  Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-20 13:44 +0000
    Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? wij <wyniijj5@gmail.com> - 2024-11-20 22:57 +0800
      Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Michael S <already5chosen@yahoo.com> - 2024-11-20 17:23 +0200
  Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-11-20 23:09 -0500
    Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? scott@slp53.sl.home (Scott Lurndal) - 2024-11-21 13:52 +0000
    Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? wij <wyniijj5@gmail.com> - 2024-11-21 22:45 +0800
  Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Rosario19 <Ros@invalid.invalid> - 2024-11-25 22:20 +0100
    Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? "Fred. Zwarts" <F.Zwarts@HetNet.nl> - 2024-11-26 10:20 +0100
      Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Rosario19 <Ros@invalid.invalid> - 2024-11-30 16:52 +0100
  Re: Is EXIT_SUCCESS/EXIT_FAILURE necessary? Andrey Tarasevich <noone@noone.net> - 2025-02-15 16:21 -0800

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