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From: Omar Polo <op@omarpolo.com>
To: Thien-Thi Nguyen <ttn@gnuvola.org>
Cc: help-gnu-emacs@gnu.org
Subject: Re: cl-delete-if vs list of overlays
Date: Wed, 09 Dec 2020 12:05:17 +0100	[thread overview]
Message-ID: <87wnxrfdea.fsf@omarpolo.com> (raw)
In-Reply-To: <874kkv706i.fsf@gnuvola.org>


Thien-Thi Nguyen <ttn@gnuvola.org> writes:

> () Omar Polo <op@omarpolo.com>
> () Wed, 09 Dec 2020 10:53:26 +0100
>
>    Why is cl-delete-if not removing items from the list?  (setq
>    delp t) evaluates to t, so it should delete.  cl-delete-if a
>    destructive function.  This is what I'm not getting.
>
> On my system, ‘C-h f cl-delete-if RET’ sez:
>
>  This is a destructive function; it reuses the storage of SEQ
>  whenever possible.
>
> So, your question becomes: When is it NOT possible to reuse the
> storage of SEQ in the process of deleting an item?

Oh my, I feel so stupid now...

I was under the (wrong) assumption that a destructive function will
always modify the list, when it's not the case.  I needed to setq the
result of cl-delete-if to the list itself to cover all the cases.

Thanks!



  reply	other threads:[~2020-12-09 11:05 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-09  9:53 cl-delete-if vs list of overlays Omar Polo
2020-12-09 10:17 ` Thien-Thi Nguyen
2020-12-09 11:05   ` Omar Polo [this message]
2020-12-09 16:14     ` Drew Adams
2020-12-09 18:16     ` Thien-Thi Nguyen

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