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bug#12314: 24.2.50; `add-to-history': use `setq' with `delete'
From: |
Eli Zaretskii |
Subject: |
bug#12314: 24.2.50; `add-to-history': use `setq' with `delete' |
Date: |
Sun, 09 Sep 2012 05:51:14 +0300 |
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Drew Adams <drew.adams@oracle.com>, 12314@debbugs.gnu.org, cyd@gnu.org
> Date: Sat, 08 Sep 2012 19:11:50 -0400
>
> >> > Why is it even necessary to talk about destructive modifications, if
> >> > we are to advise to assign the result anyway?
> >> Not sure I understand the question. It is because these operations can be
> >> destructive of list structure that we advise that.
> > If you need to forget about the old value and assign the new one
> > returned by 'delete', why does it matter that the modification was
> > destructive?
>
> Because it avoids memory allocation. I.e. 99% of the uses of
> delete/delq/nconc are simple optimizations.
I meant "why does it matter FOR THE USER that the modification was
destructive?" Users don't care about optimizations, they only care
about performance.
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', (continued)
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Eli Zaretskii, 2012/09/08
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Drew Adams, 2012/09/08
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Eli Zaretskii, 2012/09/08
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Drew Adams, 2012/09/08
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Eli Zaretskii, 2012/09/08
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Drew Adams, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Chong Yidong, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Eli Zaretskii, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Wolfgang Jenkner, 2012/09/10
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Stefan Monnier, 2012/09/08
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete',
Eli Zaretskii <=
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Stefan Monnier, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Eli Zaretskii, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Drew Adams, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Eli Zaretskii, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Drew Adams, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Stefan Monnier, 2012/09/09
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Eli Zaretskii, 2012/09/10
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Stefan Monnier, 2012/09/10
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Stefan Monnier, 2012/09/10
- bug#12314: 24.2.50; `add-to-history': use `setq' with `delete', Drew Adams, 2012/09/10