From: Stefan Monnier <monnier@iro.umontreal.ca>
To: David Kastrup <dak@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: remove-duplicates performances
Date: Fri, 20 May 2011 15:01:07 -0300 [thread overview]
Message-ID: <jwvzkmhtfst.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87tycpp8nt.fsf@fencepost.gnu.org> (David Kastrup's message of "Fri, 20 May 2011 19:46:14 +0200")
>> Yes, i understand that, what i mean is you have to write a predicate
>> each time, which could be inconvenient, instead of using :test 'equal.
> With all due respect, you are proposing a hashtable as an alternate
> mechanism. A hashtable requires a hash function and an equality test.
We do have a built-in hash function that corresponds to the `equal'
equality test, as well as one for the `eq' equality test.
Total ordering predicates consistent with `eq' or `equal' OTOH are not
currently provided, so the use of `sort' requires extra work.
Stefan
next prev parent reply other threads:[~2011-05-20 18:01 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-20 13:51 remove-duplicates performances Thierry Volpiatto
2011-05-20 14:09 ` Stefan Monnier
2011-05-20 14:39 ` Thierry Volpiatto
2011-05-20 16:14 ` Stefan Monnier
2011-05-20 17:46 ` Thierry Volpiatto
2011-05-20 15:16 ` Ted Zlatanov
2011-05-20 14:28 ` David Kastrup
2011-05-20 16:00 ` Thierry Volpiatto
2011-05-20 17:01 ` David Kastrup
2011-05-20 17:31 ` Thierry Volpiatto
2011-05-20 17:46 ` David Kastrup
2011-05-20 18:01 ` Stefan Monnier [this message]
2011-05-20 21:57 ` Pascal J. Bourguignon
2011-05-20 17:57 ` Ted Zlatanov
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