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

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
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: bug#25929: 25.2; map-delete doesn't delete permanently 1st alist elt
Date: Wed, 22 Mar 2017 18:23:03 +0100

Stefan Monnier <monnier <at> 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

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