From: Thien-Thi Nguyen <ttn@gnuvola.org>
To: help-gnu-emacs mailing list <help-gnu-emacs@gnu.org>
Subject: Re: plist-put modification by side effect
Date: Sun, 01 Feb 2009 00:02:42 +0100 [thread overview]
Message-ID: <87d4e3w031.fsf@ambire.localdomain> (raw)
In-Reply-To: <20090131210630.GC17573@stats.ox.ac.uk> (Dan Davison's message of "Sat, 31 Jan 2009 16:06:30 -0500")
() Dan Davison <davison@stats.ox.ac.uk>
() Sat, 31 Jan 2009 16:06:30 -0500
I don't get this. It says the plist is altered by side
effects. So what's with the "but just to be extra careful
use (setq ...)" advice?
If PROP is in PLIST, the natural side-effecting operation is
to splice in the VALUE at the position of the old value. Ok,
fine. Now, what if PROP is not in PLIST? How might you
implement that? How might you implement that, differently?
How might your design decision surprise the unwary caller?
thi
next prev parent reply other threads:[~2009-01-31 23:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-31 21:06 plist-put modification by side effect Dan Davison
2009-01-31 23:02 ` Thien-Thi Nguyen [this message]
2009-02-01 16:23 ` Dan Davison
[not found] ` <mailman.6441.1233508294.26697.help-gnu-emacs@gnu.org>
2009-02-01 18:22 ` Barry Margolin
2009-02-02 9:55 ` Thien-Thi Nguyen
[not found] ` <mailman.6500.1233568748.26697.help-gnu-emacs@gnu.org>
2009-02-02 18:07 ` Andreas Politz
[not found] <mailman.6361.1233436001.26697.help-gnu-emacs@gnu.org>
2009-01-31 22:46 ` Helmut Eller
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