GNU bug report logs - #25929
25.2; map-delete doesn't delete permanently 1st alist elt

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Package: emacs;

Reported by: Tino Calancha <tino.calancha <at> gmail.com>

Date: Thu, 2 Mar 2017 07:19:01 UTC

Severity: normal

Found in version 25.2

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Message #80 received at 25929 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Michael Heerdegen <michael_heerdegen <at> web.de>, 25929 <at> debbugs.gnu.org,
 Nicolas Petton <nicolas <at> petton.fr>, Tino Calancha <tino.calancha <at> gmail.com>,
 Noam Postavsky <npostavs <at> users.sourceforge.net>
Subject: Re: bug#25929: 25.2;
 map-delete doesn't delete permanently 1st alist elt
Date: Wed, 22 Mar 2017 16:31:26 -0400

>> The problem is how to make it extensible to user-defined types
>> via something like cl-generic.el (e.g. add support for avl-tree.el
>> without having to make map.el aware of avl-tree.el).

> Hm...  I haven't used cl-generic.el, but having map-delete be something
> like this work?

> (defmacro map-delete (map elem)
>   (if (symbolp map)
>       `(setq ,map (map-delete-1 ,map ,elem))
>     `(map-delete-1 ,map ,elem)))

It would work, yes.  I think the resulting semantics is pretty ugly, but
it's just a question of taste.


        Stefan
This bug report was last modified 3 years and 27 days ago.

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