From: Michal Rokos <m.rokos@sh.cvut.cz>
To: ruby-core@ruby-lang.org
Subject: Re: [PATCH] object.c ruby.h (fwd)
Date: Sat, 27 Jul 2002 00:23:52 +0900 [thread overview]
Message-ID: <20020726152347.GA23409@klokan.sh.cvut.cz> (raw)
In-Reply-To: <200207251106.g6PB6HMJ008010@miso.k.notwork.org>
On Thu, Jul 25, 2002 at 08:06:17PM +0900, GOTO Kentaro wrote:
> Something built-in to get truth value of each object may help explain
> the boolean aspect in Ruby.
>
> % ruby -e '
> module Kernel
> def truth() !!self end
> end
>
> p nil.truth
> p false.truth
> p :else.truth
>
> '
> false
> false
> true
>
I think if the RTEST returns 0 for Qnil or Qfalse, so Qnil is
the same as Qfalse. (nil is false)
If I look at SmallTalk: they distinguish between nil and false
and I feel that thier attitude is the right one.
To get the same level of real-word-perception as SmallTalk has,
it is needed to:
(1) * raise error if argument to RTEST isn't kind of Boolean
(2) * remove all #to_* and boolean (#&, #|) methods for nil.
Note (1): I know that if we do this all code will be broken and has to
be rewritten or corrected. And that's why this has no solution for
Ruby 1.x (- hopefully in Rite?)
Note (2): Makes it sence to convert 'Nothing' (nil) to Float or
Integer??? I don't think so.
PS: nil is instance NillClass (in Ruby). Class name in SmallTalk is
'UndefinedObject' - personally: I think that using nil in this sence
(UndefinedObject) is the right perception of 'nil' term.
But there are much more skilled SmallTalkers than I have - I'd
like to hear their opinion...
Michal
--
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Michal Rokos Czech Technical University, Prague
E-mail:m.rokos@sh.cvut.cz ICQ:36118339 Jabber:majkl@jabber.cz
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
next prev parent reply other threads:[~2002-07-26 15:23 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 ` unifying nil and false (Re: [PATCH] object.c ruby.h) Yukihiro Matsumoto
2002-07-25 4:59 ` 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 [this message]
2002-07-26 15:31 ` Dave Thomas
2002-07-26 16:37 ` Yukihiro Matsumoto
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