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From: Lars Ingebrigtsen <larsi@gnus.org>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: Michael Heerdegen <michael_heerdegen@web.de>,
	25929@debbugs.gnu.org, Nicolas Petton <nicolas@petton.fr>,
	Noam Postavsky <npostavs@users.sourceforge.net>,
	Tino Calancha <tino.calancha@gmail.com>
Subject: bug#25929: 25.2; map-delete doesn't delete permanently 1st alist elt
Date: Wed, 22 Mar 2017 18:23:03 +0100	[thread overview]
Message-ID: <m3poh9ql8o.fsf@stories> (raw)
In-Reply-To: <jwvd1d95jnu.fsf-monnier+emacsbugs@gnu.org> (Stefan Monnier's message of "Wed, 22 Mar 2017 13:04:32 -0400")

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

> 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)))

And then having map-delete-1 be the thing to support user-defined types?

It'd be kinda an even more unusual Lisp construct, but, on the other
hand, I don't think Lisp has ever come up with an elegant way to express
these mutating functions before, so we're free to innovate.  :-)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





  reply	other threads:[~2017-03-22 17:23 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-02  7:17 bug#25929: 25.2; map-delete doesn't delete permanently 1st alist elt Tino Calancha
2017-03-02  8:56 ` Nicolas Petton
2017-03-02 10:59 ` Nicolas Petton
2017-03-02 11:30   ` Tino Calancha
2017-03-02 12:27     ` Nicolas Petton
2017-03-02 12:34   ` Nicolas Petton
2017-03-02 13:34     ` Tino Calancha
2017-03-02 15:12     ` Stefan Monnier
2017-03-04  0:04       ` Michael Heerdegen
2017-03-04  0:16         ` Michael Heerdegen
2017-03-21 20:41         ` Lars Ingebrigtsen
2017-03-22 11:55           ` Michael Heerdegen
2017-03-22 12:01             ` Lars Ingebrigtsen
2017-03-22 12:56               ` Noam Postavsky
2017-03-22 13:31                 ` Lars Ingebrigtsen
2017-03-22 14:43                   ` Michael Heerdegen
2017-03-22 17:04                   ` Stefan Monnier
2017-03-22 17:23                     ` Lars Ingebrigtsen [this message]
2017-03-22 20:31                       ` Stefan Monnier
2017-03-22 17:02               ` Stefan Monnier
2017-03-29 15:25             ` bug#25929: 25.2; plists and map-* Lars Ingebrigtsen
2017-03-29 15:36               ` Nicolas Petton
2017-03-21 11:35       ` bug#25929: 25.2; map-delete doesn't delete permanently 1st alist elt Nicolas Petton
2017-03-21 15:11         ` Stefan Monnier
2017-03-21 18:06           ` Nicolas Petton
2017-03-21 20:29             ` Stefan Monnier
2017-04-26  7:58               ` Nicolas Petton
2017-03-02 12:36   ` npostavs
2017-03-02 12:45     ` Nicolas Petton
2022-04-26 13:34 ` Lars Ingebrigtsen
2022-04-28  3:17   ` Richard Stallman
2022-04-28 16:00     ` Drew Adams

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