From: matz@ruby-lang.org (Yukihiro Matsumoto)
To: ruby-core@ruby-lang.org
Subject: unifying nil and false (Re: [PATCH] object.c ruby.h)
Date: Thu, 25 Jul 2002 13:22:48 +0900 [thread overview]
Message-ID: <1027557154.122024.15237.nullmailer@picachu.netlab.jp> (raw)
In-Reply-To: Dave Thomas's message of "Thu, 25 Jul 2002 05:05:46 +0900" <m2d6tcsxgj.fsf@zip.local.thomases.com>
Hi,
In message "Re: [PATCH] object.c ruby.h (fwd)"
on 02/07/25, Dave Thomas <Dave@PragmaticProgrammer.com> writes:
|At the same time, I'm wondering if it would be possible to unify nil
|and false, so that they were both the same object?
"nil" and "false" are treated differently everywhere. Unifying them
will cause serious compatibility problem. For example, Thread#status
returns false for threads terminated normally, nil for threads
terminated with exceptions. See ri Thread#status. Also I've heard
they're used for three state logic (true - false - undefined).
So it's not easy to unify them.
matz.
next prev parent reply other threads:[~2002-07-25 4:22 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-24 15:02 [PATCH] object.c ruby.h (fwd) Robert Skarwecki
2002-07-24 16:51 ` Boolean class (Re: [PATCH] object.c ruby.h) Yukihiro Matsumoto
2002-07-24 19:50 ` [PATCH] object.c ruby.h (fwd) GOTO Kentaro
2002-07-24 20:05 ` Dave Thomas
2002-07-25 4:22 ` Yukihiro Matsumoto [this message]
2002-07-25 4:59 ` unifying nil and false (Re: [PATCH] object.c ruby.h) Dave Thomas
2002-07-25 6:46 ` Yukihiro Matsumoto
2002-07-25 11:06 ` [PATCH] object.c ruby.h (fwd) GOTO Kentaro
2002-07-25 13:20 ` Dave Thomas
2002-07-25 17:42 ` nobu.nokada
2002-07-25 17:55 ` Dave Thomas
2002-07-25 18:11 ` nobu.nokada
2002-07-25 18:28 ` Dave Thomas
2002-07-25 19:53 ` GOTO Kentaro
2002-07-25 20:34 ` Dave Thomas
2002-07-25 22:23 ` GOTO Kentaro
2002-07-27 8:04 ` Masaki Suketa
2002-07-27 12:40 ` Dave Thomas
2002-08-03 9:04 ` Masaki Suketa
2002-08-05 1:39 ` NAKAMURA, Hiroshi
2002-08-06 11:53 ` Masaki Suketa
2002-08-09 13:20 ` NAKAMURA, Hiroshi
2002-08-10 12:19 ` Masaki Suketa
2002-08-12 3:48 ` NAKAMURA, Hiroshi
2002-07-26 10:11 ` YANAGAWA Kazuhisa
2002-07-31 14:47 ` A truth? patch + benchmarks Christoph
2002-07-31 15:03 ` ts
2002-08-01 6:39 ` Christoph
2002-08-01 7:02 ` Yukihiro Matsumoto
2002-08-02 7:12 ` Christoph
2002-08-02 7:20 ` ts
2002-08-02 8:54 ` Christoph
2002-08-03 9:51 ` Yukihiro Matsumoto
2002-08-05 0:58 ` Christoph
2002-08-05 1:44 ` nobu.nokada
2002-08-16 6:52 ` Mswin32 build flags Christoph
2002-08-16 7:12 ` U.Nakamura
2002-09-03 18:51 ` Christoph
2002-07-26 1:16 ` [PATCH] object.c ruby.h (fwd) NAKAMURA, Hiroshi
2002-07-26 15:23 ` Michal Rokos
2002-07-26 15:31 ` Dave Thomas
2002-07-26 16:37 ` Yukihiro Matsumoto
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