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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Daniel Brockman <daniel@brockman.se>
Cc: emacs-devel@gnu.org
Subject: Re: constant `e'
Date: Sat, 10 Feb 2007 14:05:33 -0500	[thread overview]
Message-ID: <jwv64a9vnvo.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87y7n6fdod.fsf@wigwam.brockman.se> (Daniel Brockman's message of "Sat\, 10 Feb 2007 12\:35\:30 +0100")

> Incidentally, I also think `(not (null n))' looks better than `n'

Please, it's not the same thing: (not (null 2)) != 2
Code is a way to communicate, so if you write (not (null N)) instead of N,
the reader will have to wonder:
- is this a beginner who doesn't realize who could/should have just used N?
- or is it an experienced programmer who just wants to tell me something
  about his intention?
- or is it really that the code needs the value converted to a nil/t "boolean"?
Also, the compiler will have to work extra hard to try and figure out
whether it is safe to optimize it away or not.  If it's more work for the
compiler, it's probably more work for the human reader as well.


        Stefan

  parent reply	other threads:[~2007-02-10 19:05 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-09  7:37 constant `e' Drew Adams
2007-02-09  9:32 ` Juanma Barranquero
2007-02-09 11:24   ` Kim F. Storm
2007-02-09 15:08   ` Stefan Monnier
2007-02-09 15:19     ` Juanma Barranquero
2007-02-09 15:34       ` Stefan Monnier
2007-02-10 17:40       ` Richard Stallman
2007-02-09 18:33     ` Jay Belanger
2007-02-09 18:51       ` Stefan Monnier
2007-02-09 14:23 ` Richard Stallman
2007-02-09 14:32   ` Leo
2007-02-09 23:11     ` Kim F. Storm
2007-02-10  0:16       ` Drew Adams
2007-02-12 18:11         ` Stuart D. Herring
2007-02-10 17:39     ` Richard Stallman
2007-02-09 14:37   ` David Kastrup
2007-02-10 17:39     ` Richard Stallman
2007-02-09 15:33   ` Drew Adams
2007-02-09 16:30     ` Eli Zaretskii
2007-02-09 16:50       ` Drew Adams
2007-02-10  9:49         ` Eli Zaretskii
2007-02-09 23:07   ` Dieter Wilhelm
2007-02-10 17:39     ` Richard Stallman
2007-02-10 18:41     ` Slawomir Nowaczyk
2007-02-10 21:12       ` Dieter Wilhelm
2007-02-10  9:29   ` Kevin Rodgers
2007-02-10 19:13     ` Stefan Monnier
2007-02-10 19:22       ` Lennart Borgman (gmail)
2007-02-10 19:38         ` Stefan Monnier
2007-02-10 20:32           ` Lennart Borgman (gmail)
2007-02-12  5:04             ` Kevin Rodgers
2007-02-12 16:06               ` Drew Adams
2007-02-10  6:27 ` Daniel Brockman
2007-02-10  8:59   ` David Kastrup
2007-02-10 11:35     ` Daniel Brockman
2007-02-10 12:01       ` David Kastrup
2007-02-10 12:42         ` Daniel Brockman
2007-02-10 12:43       ` Alan Mackenzie
2007-02-10 14:33         ` Daniel Brockman
2007-02-10 18:05           ` Alan Mackenzie
2007-02-10 18:29             ` Daniel Brockman
2007-02-12 19:03           ` Stuart D. Herring
2007-02-12 19:57             ` Daniel Brockman
2007-02-10 17:38         ` David Kastrup
2007-02-10 18:15           ` Daniel Brockman
2007-02-12 18:51           ` Stuart D. Herring
2007-02-10 19:05       ` Stefan Monnier [this message]
2007-02-10 20:48         ` Daniel Brockman
2007-02-10 21:06           ` Stefan Monnier
2007-02-11  9:42           ` David Kastrup
2007-02-11 17:53             ` Daniel Brockman
2007-02-10 21:34       ` Edward O'Connor
2007-02-12 19:17       ` Stuart D. Herring
2007-02-12 20:37         ` Daniel Brockman
2007-02-12 20:40           ` David Kastrup
2007-02-10 17:41   ` Richard Stallman
2007-02-10  9:02 ` Alan Mackenzie
2007-02-10  9:51   ` Jason Rumney
2007-02-12 18:16     ` Stuart D. Herring
2007-02-10 15:13   ` Juanma Barranquero
2007-02-10 19:12   ` Stefan Monnier
2007-02-11  0:43   ` David Hansen
2007-02-11  1:13     ` Jay Belanger
2007-02-11  1:24   ` Drew Adams
2007-02-10 18:53 ` Chong Yidong
  -- strict thread matches above, loose matches on Subject: below --
2007-02-13  2:34 djh
2007-02-13  8:23 ` Werner LEMBERG

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