From: Nicolas Richard <theonewiththeevillook@yahoo.fr>
To: "Andreas Röhler" <andreas.roehler@easy-emacs.de>
Cc: 15117@debbugs.gnu.org
Subject: bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value
Date: Tue, 11 Feb 2014 12:16:38 +0100 [thread overview]
Message-ID: <87vbwl99wp.fsf@yahoo.fr> (raw)
In-Reply-To: <52FA00E7.2050108@easy-emacs.de> ("Andreas \=\?utf-8\?Q\?R\=C3\=B6h\?\= \=\?utf-8\?Q\?ler\=22's\?\= message of "Tue, 11 Feb 2014 11:52:23 +0100")
Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
> Am 11.02.2014 05:01, schrieb Stefan Monnier:
>> Says you. For me (and most definitions of side-effects I've ever seen),
>> a side-effecting function is something like a function where the calls
>> can't simply be replaced by their return value.
> Can't see a logic link between a possible return value and the notion of side-effect.
> It all depends from the purpose of the function.
I guess this is a slight misunderstanding. The notion of side-effect is
well defined in CS: « a function or expression is said to have a side
effect if, in addition to returning a value, it also modifies some state
or has an observable interaction with calling functions or the outside
world. »
(http://en.wikipedia.org/wiki/Side_effect_%28computer_science%29)
The notions of "mostly-unintended effect" (like so: (defun
my-point-at-eol (progn (end-of-line) (point)))) or "multi-purpose
functions by means of global variables" (e.g. the use of 'org-ts-what in
org-at-timestamp-p -- which is kind of scary if I may say) are only
special cases of side effects.
--
Nico.
next prev parent reply other threads:[~2014-02-11 11:16 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-17 15:59 bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value Drew Adams
2014-02-08 5:08 ` Lars Ingebrigtsen
2014-02-10 0:12 ` Drew Adams
2014-02-10 2:39 ` Lars Ingebrigtsen
2014-02-10 2:45 ` Drew Adams
2014-02-10 16:27 ` Stefan Monnier
2014-02-10 21:16 ` Drew Adams
2014-02-11 1:07 ` Dmitry Gutov
2014-02-11 6:40 ` Drew Adams
2014-02-11 1:28 ` Juanma Barranquero
2014-02-11 6:43 ` Drew Adams
2014-02-11 16:31 ` Eli Zaretskii
2014-02-11 17:29 ` Drew Adams
2014-02-11 18:05 ` Eli Zaretskii
2014-02-11 18:42 ` Andreas Röhler
2014-02-11 18:58 ` Eli Zaretskii
2014-02-11 19:13 ` Drew Adams
2014-02-11 19:26 ` Andreas Röhler
2014-02-11 17:36 ` Juanma Barranquero
2014-02-11 2:52 ` Glenn Morris
2014-02-11 4:01 ` Stefan Monnier
2014-02-11 10:52 ` Andreas Röhler
2014-02-11 11:16 ` Nicolas Richard [this message]
2014-02-11 12:10 ` Andreas Röhler
[not found] <<1dc76f7a-5481-41df-b976-ec22229d7283@default>
[not found] ` <<874n4a42f0.fsf@building.gnus.org>
[not found] ` <<1281d0fd-77cb-45e2-b99d-f4ad24b0fc4e@default>
[not found] ` <<jwvr47b3pcw.fsf-monnier+emacsbugs@gnu.org>
[not found] ` <<2fefcbaf-9417-4f57-93af-490ea73aea98@default>
[not found] ` <<CAAeL0SRYdnYryaVzADc5L61vgM0EPQeBzG2h327YynitS18tXA@mail.gmail.com>
[not found] ` <<68a64949-d801-4d09-8dc8-4b6ae0824855@default>
[not found] ` <<8361oltxu1.fsf@gnu.org>
[not found] ` <<67b917ca-8b69-49fd-9e12-68da310f7567@default>
[not found] ` <<8338jpttic.fsf@gnu.org>
2014-02-11 18:14 ` Drew Adams
2014-02-11 18:17 ` Eli Zaretskii
[not found] ` <<5889df4e-4343-4136-ae49-4062659da625@default>
[not found] ` <<831tz9tsy2.fsf@gnu.org>
2014-02-11 18:26 ` Drew Adams
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