From: "Davis Herring" <herring@lanl.gov>
To: "Wilson Snyder" <wsnyder@wsnyder.org>
Cc: emacs-devel@gnu.org
Subject: Re: Suggestions to remove one alist's members from another
Date: Fri, 9 Apr 2010 07:11:46 -0700 (PDT) [thread overview]
Message-ID: <54158.130.55.118.19.1270822306.squirrel@webmail.lanl.gov> (raw)
In-Reply-To: <20100409130204.990F218838C@wsnyder.org>
> If not, my thought is this: when the list was over some size
> I'd determine experimentally, it would instead build a hash
> table from in-list and hit the not-alist against that. When
> complete it would unfortunately require a second pass
> through the in-alist to return it maintaining the original
> order.
Why not build a hash table (of the cars of the elements) from not-alist
instead? Then you can just walk in-alist, skipping elements that are in
the hash (that is, whose cars are in it) and adding the rest to out-alist
and (their cars to) the hash.
Davis
--
This product is sold by volume, not by mass. If it appears too dense or
too sparse, it is because mass-energy conversion has occurred during
shipping.
next prev parent reply other threads:[~2010-04-09 14:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-09 13:02 Suggestions to remove one alist's members from another Wilson Snyder
2010-04-09 14:11 ` Davis Herring [this message]
2010-04-09 14:16 ` Wilson Snyder
2010-04-09 14:45 ` Drew Adams
2010-04-09 14:48 ` Davis Herring
2010-04-09 15:05 ` David Kastrup
2010-04-09 17:31 ` Stephen J. Turnbull
-- strict thread matches above, loose matches on Subject: below --
2010-04-09 12:27 Wilson Snyder
2010-04-09 15:12 ` David Kastrup
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=54158.130.55.118.19.1270822306.squirrel@webmail.lanl.gov \
--to=herring@lanl.gov \
--cc=emacs-devel@gnu.org \
--cc=wsnyder@wsnyder.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).