From: Nicolas Petton <nicolas@petton.fr>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: map-put! and (setf (map-elt ...) ..) on lists
Date: Mon, 17 Dec 2018 12:38:04 +0100 [thread overview]
Message-ID: <87lg4otmcj.fsf@petton.fr> (raw)
In-Reply-To: <jwva7l86n0d.fsf-monnier+emacs@gnu.org>
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Stefan Monnier <monnier@iro.umontreal.ca> writes:
Hi Stefan,
> The current handling of map-put on lists is very ad-hoc:
> The gv-expander of `map-elt` tests if the arg is a list and if so
> delegates to `alist-get`.
>
> It kind of works, but for a library that's supposed to be generic and
> expandable to other map types, this is undesirable.
>
> So in the patch below I change this such that `map-elt` does not special
> case lists any more. Instead `map-put!` is changed to signal a special
> error when it can't do its job, and the gv-expander of `map-elt` catches
> this error and delegates the job to a new non-side-effecting
> `map-insert`.
>
> With this, we can add new map types via defmethod that work like lists
> (i.e. that don't support inplace update but can still be modified via
> `setf`).
>
> WDYT?
I think it's a good step forward, thank you.
I'd like to start thinking about adding support for plists in map.el.
nico
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prev parent reply other threads:[~2018-12-17 11:38 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-14 17:32 map-put! and (setf (map-elt ...) ..) on lists Stefan Monnier
2018-12-16 16:32 ` Tom Tromey
2018-12-16 17:37 ` Drew Adams
2018-12-16 18:20 ` Stefan Monnier
2018-12-16 23:06 ` Tom Tromey
2018-12-17 3:16 ` Stefan Monnier
2018-12-17 4:08 ` Stefan Monnier
2018-12-17 11:41 ` Nicolas Petton
2018-12-17 16:06 ` Eli Zaretskii
2018-12-17 16:07 ` Drew Adams
2018-12-18 10:11 ` Nicolas Petton
2018-12-18 13:56 ` Stefan Monnier
2018-12-18 15:42 ` Drew Adams
2018-12-18 15:34 ` Drew Adams
2018-12-18 15:47 ` Stefan Monnier
2018-12-18 16:34 ` Nicolas Petton
2018-12-18 17:41 ` Drew Adams
2018-12-18 20:44 ` Nicolas Petton
2018-12-16 18:21 ` Stefan Monnier
2018-12-17 11:38 ` Nicolas Petton [this message]
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