From: Andy Sonnenburg <andy22286@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Binary Search Tree and Treap Functions bst-assq and treap-put
Date: Sun, 4 Dec 2016 07:14:26 -0500 [thread overview]
Message-ID: <CAHtDYY9SzUt9_DCXuLUJY7xe2p0yJ9cgx7taKjMyZLErp2=2Vg@mail.gmail.com> (raw)
In-Reply-To: <CAHtDYY9__BVOAs+vX=Tj8Bf31X6-Duv3f9MS8vcGwsnO2x74+w@mail.gmail.com>
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That's too bad (I mean, its good for performance, but unfortunate one of
the use cases doesn't exist). However, the treap functions may still be of
general use. Let me know if there is any interest. They are documented
and tested. They fill a gap between alists (persistent, linear lookup) and
hash tables (ephemeral, constant lookup) by being persistent while
providing average case logarithmic lookup.
On Dec 3, 2016 11:34 PM, "Stefan Monnier" <monnier@iro.umontreal.ca> wrote:
> now. I intend to use these functions to make lexically-scoped variable
> lookup average case O(log(n)) instead of the current O(n).
AFAIK it's O(1) currently (for byte-compiled code only, but performance
of non-byte-compiled code should be of no importance).
Stefan
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next prev parent reply other threads:[~2016-12-04 12:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-04 1:42 Binary Search Tree and Treap Functions bst-assq and treap-put Andy Sonnenburg
2016-12-04 4:33 ` Stefan Monnier
[not found] ` <CAHtDYY-xis2R4Nbvq_8Ht0nKsm6KjGqW=NSC7O3+5FvNF9w+Dg@mail.gmail.com>
[not found] ` <CAHtDYY9__BVOAs+vX=Tj8Bf31X6-Duv3f9MS8vcGwsnO2x74+w@mail.gmail.com>
2016-12-04 12:14 ` Andy Sonnenburg [this message]
2016-12-04 17:04 ` Stefan Monnier
2016-12-04 17:13 ` Andy Sonnenburg
2016-12-04 17:39 ` Andy Sonnenburg
2016-12-04 17:41 ` Eli Zaretskii
2016-12-12 6:15 ` John Wiegley
2016-12-12 12:56 ` Stefan Monnier
2016-12-12 16:46 ` John Wiegley
2016-12-12 16:58 ` Stefan Monnier
2016-12-12 17:06 ` John Wiegley
2016-12-12 17:29 ` Stefan Monnier
2017-10-22 16:35 ` Noam Postavsky
2017-10-22 16:44 ` Andreas Schwab
2017-10-22 16:44 ` Stefan Monnier
2017-10-22 17:12 ` Noam Postavsky
2017-10-23 0:37 ` Stefan Monnier
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