From: Jean-Christophe Filliatre <Jean-Christophe.Filliatre@lri.fr>
To: Lukasz Lew <ll189417@zodiac.mimuw.edu.pl>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Is it possible to implement this?
Date: Wed, 20 Nov 2002 08:45:51 +0100 [thread overview]
Message-ID: <15835.15791.28497.136288@lri.lri.fr> (raw)
In-Reply-To: <Pine.LNX.4.44.0211200704430.22866-100000@zodiac.mimuw.edu.pl>
Lukasz Lew writes:
>
> Let's suppose wy have module with such interface
>
> module X =
> type t (*big data structure*)
>
> add : string -> t
> delete : t -> ()
>
> And in the other module i keep X.t list, and i want to keep with each of
> them additional data of unknown type [at time of X compilation]
You could have a polymorphic type "'a X.t" where 'a stands for the
type of the associated data, and provide functions "add_info : 'a ->
'a t -> unit" and "get_info : 'a t -> 'a" in module X.
> Other is to keep with every t int identifier as small as possible, to keep
> additional data in array, but this solution isn't very good.
Following this kind of idea, you could do hash-consing of your X.t
values, so that they are allocated only once; doing this, it is easy
to associate a unique integer to each value in X.t, which will allow
you to build an efficient map over X.t.
I already wrote an hash-consing module, available here:
http://www.lri.fr/~filliatr/software.en.html
(By the way, doing hash-consing has many other advantages such as
saving space, providing O(1) equality, ...)
Hope this helps,
--
Jean-Christophe Filliâtre
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prev parent reply other threads:[~2002-11-20 7:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-20 6:16 Lukasz Lew
2002-11-20 7:45 ` Jean-Christophe Filliatre [this message]
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