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From: Pietro Abate <Pietro.Abate@anu.edu.au>
To: caml-list@yquem.inria.fr, caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] type troubles with functors
Date: Wed, 22 Jun 2005 16:48:36 +1000	[thread overview]
Message-ID: <20050622064836.GA27983@pulp.anu.edu.au> (raw)
In-Reply-To: <8ecdad970506212153417f77b5@mail.gmail.com>

what about 

module type OrderedType = sig
      type t
      val compare : t -> t -> int
end


module type S = sig
      type elt
      type t
      type set
      val to_list : t -> elt list
      val to_set : t -> set
end

module Make (Ord : OrderedType) : S = struct
        module EltSet = Set.Make(Ord)
        type elt = EltSet.elt
        type set = EltSet.t
        type t = { l : elt list; s : set }
        let to_list t = t.l
        let to_set t = t.s

end


I'm far to be an expert, but this (or something similar) should work.

p

-- 
++ Blog: http://blog.rsise.anu.edu.au/?q=pietro
++ 
++ "All great truths begin as blasphemies." -George Bernard Shaw
++ Please avoid sending me Word or PowerPoint attachments.
   See http://www.fsf.org/philosophy/no-word-attachments.html


  reply	other threads:[~2005-06-22  6:48 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-22  4:53 Scott Duckworth
2005-06-22  6:48 ` Pietro Abate [this message]
2005-06-22  7:50   ` [Caml-list] " Virgile Prevosto

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