Re: multi-eq hash tables

[Lars Ingebrigtsen <larsi@gnus.org>]

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

> Maybe we should introduce something like:
>
>     (define-hash-table-test shallow-equal
>       (lambda (x1 x2) (while (and (consp x1) (consp x2) (eql (car x1) (car x2)))
>                         (setq x1 (cdr x1)) (setq x2 (cdr x2)))
>                       (equal x1 x2)))
>       ...)

Yes, that would be excellent.

> and we could even improve the weakness support so that `key` used with
> such a hashtable would mean that as soon as one of the values in the
> key's list can be GC'd then the entry is removed.
>
> This way we could have our hash table such that entries are flushed by
> the GC when a terminal disappears or when one of the tool-bar-map
> objects dies (instead of the current code which prevents us from GC'ing
> the terminal objects and the old tool bar maps).

Hm, interesting...  It's slightly niche, though.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no