From: Daniel Colascione <dancol@dancol.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Leo Liu <sdl.web@gmail.com>, emacs-devel@gnu.org
Subject: Re: Generators (iterators) for Gnu Emacs
Date: Fri, 05 Dec 2014 17:08:26 -0500 [thread overview]
Message-ID: <54822CDA.1030508@dancol.org> (raw)
In-Reply-To: <jwv1toeymrj.fsf-monnier+emacs@gnu.org>
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On 12/05/2014 01:32 PM, Stefan Monnier wrote:
>> I'd really rather signal to stop iteration. That way, it's harder to ignore
>> end-of-iteration and loop forever and it remains possible to iterate over
>> *any* value. condition-case is setjmp. I'm not *that* concerned by
>> performance. The only other reasonable alternative is for iterators to
>> yield a cons (terminal-p . value), and consing is going to be much worse
>> than condition-case.
>
> The alternative I was thinking was to return a unique value, as in:
>
> (defvar gen-eog (make-symbol "¡end-of-generator!"))
> (defun gen-eog-p (x) (eq x gen-oeg))
>
Right. That's the approach I don't like: now there's a value you can't enumerate. What if you wanted to enumerate, say, the values of all symbols?
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next prev parent reply other threads:[~2014-12-05 22:08 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-04 23:43 Generators (iterators) for Gnu Emacs Michael Heerdegen
2014-12-05 1:55 ` Stefan Monnier
2014-12-05 2:42 ` Leo Liu
2014-12-05 3:23 ` Daniel Colascione
2014-12-05 3:32 ` Leo Liu
2014-12-05 4:19 ` Stefan Monnier
2014-12-05 8:52 ` Leo Liu
2014-12-05 14:40 ` Stefan Monnier
2014-12-05 14:48 ` Stefan Monnier
2014-12-05 15:34 ` Daniel Colascione
2014-12-05 18:32 ` Stefan Monnier
2014-12-05 22:08 ` Daniel Colascione
2014-12-06 9:38 ` Stephen J. Turnbull
2014-12-05 22:08 ` Daniel Colascione
2014-12-05 22:08 ` Daniel Colascione
2014-12-05 22:08 ` Daniel Colascione [this message]
2014-12-05 22:08 ` Daniel Colascione
2014-12-05 22:08 ` Daniel Colascione
2014-12-05 22:08 ` Daniel Colascione
2014-12-05 22:08 ` Daniel Colascione
2014-12-05 22:08 ` Daniel Colascione
2014-12-05 9:54 ` David Kastrup
2014-12-05 14:51 ` Stefan Monnier
2014-12-05 17:12 ` Michael Heerdegen
2014-12-05 18:34 ` Stefan Monnier
2014-12-05 19:06 ` Michael Heerdegen
2014-12-06 3:53 ` Stefan Monnier
2014-12-05 18:01 ` Michael Heerdegen
2014-12-05 19:19 ` Stefan Monnier
2014-12-05 22:54 ` Michael Heerdegen
2014-12-05 5:47 ` Thierry Volpiatto
2014-12-05 14:49 ` Stefan Monnier
2014-12-05 17:20 ` Michael Heerdegen
2014-12-05 19:16 ` Stefan Monnier
2014-12-05 22:26 ` Daniel Colascione
2014-12-06 0:13 ` Michael Heerdegen
2014-12-06 0:22 ` Michael Heerdegen
2014-12-06 4:09 ` Stefan Monnier
2014-12-06 9:12 ` Daniel Colascione
2014-12-06 22:24 ` Stefan Monnier
2014-12-07 3:10 ` Daniel Colascione
2014-12-07 6:12 ` Stefan Monnier
2014-12-07 7:51 ` Daniel Colascione
2014-12-07 16:22 ` Ted Zlatanov
2014-12-07 17:40 ` Namespace macros (was: Generators (iterators) for Gnu Emacs) Helmut Eller
2014-12-08 0:11 ` Artur Malabarba
2014-12-08 7:55 ` Namespace macros Helmut Eller
2014-12-08 8:36 ` Artur Malabarba
2014-12-08 9:17 ` Helmut Eller
2014-12-08 11:02 ` Artur Malabarba
2014-12-08 11:21 ` Dmitry Gutov
2014-12-08 11:42 ` Artur Malabarba
2014-12-08 11:52 ` Dmitry Gutov
2014-12-08 12:52 ` Helmut Eller
2014-12-08 20:59 ` Richard Stallman
2014-12-08 23:37 ` Artur Malabarba
2014-12-09 0:25 ` Helmut Eller
2014-12-07 18:30 ` Generators (iterators) for Gnu Emacs Drew Adams
2014-12-08 0:25 ` Richard Stallman
2014-12-08 1:21 ` Daniel Colascione
2014-12-08 5:34 ` Drew Adams
2014-12-08 20:59 ` Richard Stallman
2014-12-08 21:48 ` Stefan Monnier
2014-12-09 19:35 ` namespaces Ivan Shmakov
2014-12-08 20:59 ` Generators (iterators) for Gnu Emacs Richard Stallman
[not found] ` <<E1Xxm91-0000jQ-Mr@fencepost.gnu.org>
[not found] ` <<5484FD09.60603@dancol.org>
[not found] ` <<9ae6762d-a52a-4a06-b2e9-dab893a22d38@default>
[not found] ` <<E1Xy5Os-0004cU-HF@fencepost.gnu.org>
2014-12-08 21:17 ` Drew Adams
2014-12-07 16:51 ` Stefan Monnier
2014-12-07 17:29 ` Nic Ferrier
2014-12-07 21:17 ` Stefan Monnier
2014-12-07 21:26 ` Nic Ferrier
2014-12-07 21:32 ` Daniel Colascione
2014-12-07 21:43 ` Drew Adams
2014-12-07 23:31 ` Stefan Monnier
2014-12-07 23:39 ` Daniel Colascione
2014-12-08 2:23 ` Stefan Monnier
2014-12-08 2:24 ` Daniel Colascione
2014-12-08 3:23 ` Stefan Monnier
2014-12-08 10:01 ` Thien-Thi Nguyen
2014-12-08 20:35 ` David Engster
2014-12-08 21:45 ` Stefan Monnier
2014-12-08 0:18 ` Dmitry Gutov
2014-12-08 2:25 ` Stefan Monnier
2014-12-08 2:55 ` Dmitry Gutov
2014-12-07 8:54 ` David Kastrup
2014-12-07 9:25 ` Stephen J. Turnbull
[not found] <<877fy77zhp.fsf@web.de>
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