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From: "Harrison, John R" <johnh@ichips.intel.com>
To: <caml-list@inria.fr>
Cc: "Harrison, John R" <johnh@ichips.intel.com>
Subject: [Caml-list] Efficient and canonical set representation?
Date: Thu, 6 Nov 2003 08:41:04 -0800	[thread overview]
Message-ID: <3C4C3612EC443546A33E57003DB4F0F914C26B@orsmsx409.jf.intel.com> (raw)

Does anyone know a representation of finite sets over an orderable polymorphic type
that's (1) efficient and (2) canonical? Even better would be a CAML or OCaml
implementation. More precisely I'm looking for:

  1. Log-time lookup and insertion, and linear-time union, intersection etc.

  2. Equal sets are represented by the same object.

For example, ordered lists satisfy (2) but only part of (1), while all the variants
of balanced trees I can remember that satisfy (1) --- AVL trees etc. --- fail (2).

Thanks,

John.

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             reply	other threads:[~2003-11-06 16:41 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-06 16:41 Harrison, John R [this message]
2003-11-06 17:04 ` Brian Hurt
2003-11-07  3:43 ` Eray Ozkural
2003-11-07  3:52 ` Eray Ozkural
2003-11-07 14:15 Harrison, John R
2003-11-07 15:27 Fred Smith
2003-11-07 15:44 ` Samuel Lacas
2003-11-08 16:50   ` Eray Ozkural
2003-11-07 17:27 Fred Smith
2003-11-10 13:24 ` Diego Olivier Fernandez Pons
2003-11-10 19:28   ` Julien Signoles
2003-11-12  0:20 Harrison, John R
2003-11-12  2:04 ` Brian Hurt
2003-11-12 16:16 ` Diego Olivier Fernandez Pons
2003-11-12  3:34 Harrison, John R
2003-11-12  7:50 ` Brian Hurt
2003-11-12 17:18 Harrison, John R

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