RE: [Caml-list] Efficient and canonical set representation?

[Julien Signoles <Julien.Signoles@lri.fr>]

On Mon, 10 Nov 2003, Diego Olivier Fernandez Pons wrote:

> Patricia sets seem to be what you are looking for.
>  (1). Efficient usual operations (lookup, insertion, union)
>  (2). Structural equality
>
> Their only problem is that they cannot handle polymorphic orderable
> types but only integers...
>
> Hash the data, use this key to insert it in a patricia map and solve
> the collisions by chaining in an ordered list (with the polymorphic
> [compare] function). (1) and (2) still hold under usual hypothesis on
> the rate of collisions.
>
> A few changes to JCF's implementation should be enough.

I think JCF's Hmap module is what you want.
A hmap is a map over hash-consed values implemented as Patricia Trees.
See http://www.lri.fr/~filliatr/software.en.html for more details.

Julien Signoles
-- 
mailto:Julien.Signoles@lri.fr ; http://www.lri.fr/~signoles
"In theory, practice and theory are the same,
but in practice they are different" (Larry McVoy)

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