From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Dave Abrahams <dave@boostpro.com>
Cc: emacs-devel@gnu.org
Subject: Re: Side effects of `sort'
Date: Thu, 01 Mar 2012 17:25:07 -0500 [thread overview]
Message-ID: <jwvobsgm040.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <m2sjhsdodo.fsf@boostpro.com> (Dave Abrahams's message of "Thu, 01 Mar 2012 16:04:19 -0500")
> Lisp doesn't really have access to "the input list" in any real sense:
> (sort (identity x))
> do you expect x to be rebound?
It doesn't hav access to `x' but it has access to the list, obviously.
If the input is nil, the output is nil, and if the input is a cons, the
output could be the same cons. It just means that `sort' would have
to fiddle not only with `cdr's but also with the `car's.
Not worth the trouble, tho.
Stefan
next prev parent reply other threads:[~2012-03-01 22:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-01 19:58 Side effects of `sort' Daniel Schoepe
2012-03-01 20:52 ` Tassilo Horn
2012-03-01 21:04 ` Dave Abrahams
2012-03-01 21:34 ` Daniel Schoepe
2012-03-01 22:25 ` Stefan Monnier [this message]
2012-03-02 6:13 ` Miles Bader
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