From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: Thomas Fischbacher <Thomas.Fischbacher@Physik.Uni-Muenchen.DE>
Cc: Christian Lindig <lindig@cs.uni-sb.de>, Caml List <caml-list@inria.fr>
Subject: Re: [Caml-list] EQ hash tables?
Date: Wed, 12 Oct 2005 17:06:24 +0200 [thread overview]
Message-ID: <434D2670.7000507@inria.fr> (raw)
In-Reply-To: <Pine.LNX.4.61.0510121304510.13519@eiger.cip.physik.uni-muenchen.de>
> Hm, okay. I agree that this does give me the same semantics.
> But doesn't this degrade expected lookup performance to an O(n) list
> lookup if I put a lot of stuff into the hash which is (=) but not (==)?
Yes, of course. It depends on your application. For things like
hash-consing, this approach (standard hash function + comparison finer
than (=)) can still work well. Alternatively, you can always put
unique integers in the data type used as key.
- Xavier Leroy
next prev parent reply other threads:[~2005-10-12 15:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-10 13:42 [Caml-list] possible to define a type where = is forbidden ? yoann padioleau
2005-10-10 15:04 ` Thomas Fischbacher
2005-10-11 14:56 ` EQ hash tables? Thomas Fischbacher
2005-10-12 7:41 ` [Caml-list] " Hendrik Tews
2005-10-12 8:02 ` Xavier Leroy
2005-10-12 11:11 ` Thomas Fischbacher
2005-10-12 15:06 ` Xavier Leroy [this message]
2005-10-12 17:53 ` Thomas Fischbacher
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
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=434D2670.7000507@inria.fr \
--to=xavier.leroy@inria.fr \
--cc=Thomas.Fischbacher@Physik.Uni-Muenchen.DE \
--cc=caml-list@inria.fr \
--cc=lindig@cs.uni-sb.de \
/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.
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 NNTP newsgroup(s).