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From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: help-gnu-emacs@gnu.org
Subject: Re: plist-put: destructive?
Date: Sat, 21 Jan 2017 08:41:53 -0800	[thread overview]
Message-ID: <8737gcxt4e.fsf@ericabrahamsen.net> (raw)
In-Reply-To: jwvy3y5xfjk.fsf-monnier+gmane.emacs.help@gnu.org

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> So what's the ambiguity? Are there circumstances where a simple
>> plist-put isn't going to modify the original plist?
>
> Yes, when the plist is empty.

Thanks to you both. I'm working with existing plists, so I'll drop the
setqs, that's a relief.

> BTW, in recent Emacsen, you can use
>
>     (setf (alist-get K AL) V)
>
> and it works even when the alist is nil (but it requires AL to be
> a valid *place* rather than an arbitrary expression).  You could make
> something similar for plist-get.

Making something similar would just be the `gv-define-simple-setter'
call I had in the original message, right?




  parent reply	other threads:[~2017-01-21 16:41 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-20 19:13 plist-put: destructive? Eric Abrahamsen
2017-01-21  3:25 ` Stefan Monnier
2017-01-21 10:25   ` tomas
2017-01-21 16:41   ` Eric Abrahamsen [this message]
2017-01-21 17:13     ` Drew Adams
2017-01-22  0:50       ` Eric Abrahamsen
2017-01-22 10:08         ` Philipp Stephani
2017-01-22 13:10           ` Eric Abrahamsen
2017-01-22 17:30         ` Stefan Monnier
2017-01-23  0:31           ` Eric Abrahamsen
2017-01-23  9:01           ` tomas
2017-01-21 23:03     ` Stefan Monnier
2017-01-22  1:15       ` Eric Abrahamsen
2017-01-21  8:13 ` tomas

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