From: Kenichi Handa <handa@m17n.org>
Cc: monnier+gnu/emacs@rum.cs.yale.edu
Subject: Re: request for a new function, say, `sequence'
Date: Wed, 26 Mar 2003 08:11:37 +0900 (JST) [thread overview]
Message-ID: <200303252311.IAA08003@etlken.m17n.org> (raw)
In-Reply-To: <200303251527.h2PFR0lO018653@rum.cs.yale.edu> (monnier+gnu/emacs@rum.cs.yale.edu)
In article <200303251527.h2PFR0lO018653@rum.cs.yale.edu>, "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu> writes:
>> (defun dev-charseq (from &optional to)
>> (if (null to) (setq to from))
>> (mapcar (function (lambda (x) (indian-glyph-char x 'devanagari)))
>> (devanagari-range from to)))
> But in this example as well a variant of `dotimes' would work just as well
> and would avoid the unnecessary consing.
Modify the resulting list of devanagari-range destructively
will also avoid the unnecessary consing.
> Emacs is not very good at efficiently consing+GCing, so
> it's good to avoid such things when it can be done without
> impacting the readbility (Emacs-21 is dog slow on my
> 266Mhz machine).
Yes, I know. But the main reason for my proposal is for
readability. Currently, the above function is used mainly
for defining a data in defvar, so the speed is not that
important. On the other hand, XXX-util.el (especially the
data definition parts) must be read and modified by native
XXX users who may not be familiar with lisp. So, it's very
important to provide easy-to-understand data definition
parts.
> Also, all the examples I've seen use lists. Given my background in
> type-systems, I must say that I don't like functions that returns either
> a list or a vector or a string depending on some extra arg. If we
> want a function for convenience (rather than performance), then
> returning a list is good enough. You can always pass the result
> to `string' or to `vector' if you want something else.
As far as I see the current usage, a function returning a
list is enough. So, I don't insist on having TYPE argument.
> Anyway, blue is the color for my bykeshed, what is yours ?
What is "bykeshed"? My dictionary doesn't have that word.
> will show you that CL is used all over the place, including in files that
> are pre-loaded (though fewer of them, admittedly). As long as CL is only
> needed when byte-compiling the file, it's OK (i.e. if it's wrapped in
> `eval-when-compile'). At least that was RMS' official position last time
> this was brought up.
Thank you for clarifying that. Ok, I'll use
(eval-when-compile (require 'cl)
in a place that is appropriate.
---
Ken'ichi HANDA
handa@m17n.org
next prev parent reply other threads:[~2003-03-25 23:11 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-23 3:02 request for a new function, say, `sequence' Kenichi Handa
2003-03-24 15:41 ` Stefan Monnier
2003-03-25 0:15 ` Kenichi Handa
2003-03-25 0:50 ` Kenichi Handa
2003-03-25 0:57 ` Stefan Monnier
2003-03-25 1:25 ` Kenichi Handa
2003-03-25 1:47 ` Luc Teirlinck
2003-03-25 1:51 ` Luc Teirlinck
2003-03-25 1:59 ` Kenichi Handa
2003-03-25 2:29 ` Luc Teirlinck
2003-03-25 1:57 ` Satyaki Das
2003-03-25 2:08 ` Kenichi Handa
2003-03-25 2:41 ` Satyaki Das
2003-03-25 4:46 ` Kenichi Handa
2003-03-25 5:05 ` Satyaki Das
2003-03-25 5:40 ` Kenichi Handa
2003-03-25 20:10 ` Satyaki Das
2003-03-26 0:18 ` Kenichi Handa
2003-03-26 1:44 ` Satyaki Das
2003-03-26 2:38 ` Luc Teirlinck
2003-03-26 7:31 ` Edward O'Connor
2003-03-26 8:48 ` Thien-Thi Nguyen
2003-03-26 12:18 ` Kenichi Handa
2003-03-27 3:30 ` Richard Stallman
2003-04-03 2:54 ` Kenichi Handa
2003-04-03 3:44 ` Miles Bader
2003-04-03 22:52 ` Richard Stallman
2003-04-03 10:41 ` Thien-Thi Nguyen
2003-04-04 2:11 ` Vinicius Jose Latorre
2003-04-04 22:23 ` Richard Stallman
2003-04-05 2:10 ` Vinicius Jose Latorre
2003-04-06 2:00 ` Richard Stallman
2003-04-08 8:10 ` Kenichi Handa
2003-04-03 22:52 ` Richard Stallman
2003-03-25 15:27 ` Stefan Monnier
2003-03-25 23:11 ` Kenichi Handa [this message]
2003-03-26 0:11 ` Miles Bader
2003-03-26 0:40 ` Luc Teirlinck
2003-03-26 1:34 ` Miles Bader
2003-03-26 0:54 ` Kenichi Handa
2003-03-26 1:29 ` Miles Bader
2003-03-26 15:44 ` Stefan Monnier
2003-03-27 0:09 ` Luc Teirlinck
2003-03-27 15:20 ` Stefan Monnier
2003-03-27 15:53 ` Luc Teirlinck
2003-03-27 16:06 ` Stefan Monnier
2003-03-27 17:03 ` Luc Teirlinck
2003-03-27 17:08 ` Stefan Monnier
2003-03-26 2:41 ` Richard Stallman
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