From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <jon@ffconsultancy.com>
X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on yquem.inria.fr
X-Spam-Level: 
X-Spam-Status: No, score=0.0 required=5.0 tests=AWL autolearn=disabled 
	version=3.1.3
Received: from concorde.inria.fr (concorde.inria.fr [192.93.2.39])
	by yquem.inria.fr (Postfix) with ESMTP id 71B1CBC0A
	for <caml-list@yquem.inria.fr>; Wed,  3 Jan 2007 03:29:00 +0100 (CET)
Received: from pih-relay05.plus.net (pih-relay05.plus.net [212.159.14.132])
	by concorde.inria.fr (8.13.6/8.13.6) with ESMTP id l032Sx7s010607
	(version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO)
	for <caml-list@yquem.inria.fr>; Wed, 3 Jan 2007 03:29:00 +0100
Received: from [80.229.56.224] (helo=[10.0.0.5])
	 by pih-relay05.plus.net with esmtp (Exim) id 1H1vsB-0006DI-7C
	for caml-list@yquem.inria.fr; Wed, 03 Jan 2007 02:28:59 +0000
From: Jon Harrop <jon@ffconsultancy.com>
Organization: Flying Frog Consultancy Ltd.
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] symbol table containing symbol tables
Date: Wed, 3 Jan 2007 02:26:57 +0000
User-Agent: KMail/1.9.5
References: <886949.65043.qm@web82112.mail.mud.yahoo.com>
In-Reply-To: <886949.65043.qm@web82112.mail.mud.yahoo.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-15"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200701030226.57444.jon@ffconsultancy.com>
X-Miltered: at concorde with ID 459B14EB.002 by Joe's j-chkmail (http://j-chkmail . ensmp . fr)!
X-Spam: no; 0.00; ocaml:01 recursive:01 sig:01 struct:01 sig:01 ocaml:01 frog:98 wrote:01 rec:01 rec:01 caml-list:01 int:01 int:01 modules:02 caml:02 

On Wednesday 03 January 2007 01:59, William W Smith wrote:
> Do I need one of the more advanced features of OCaml that I don't currently
> understand to use Map the way that I want without writing a whole table
> class?  I don't even see how I can use Map from inside the table class to
> do what I want which would also be acceptable.

You need recursive modules, something like this:

# module rec StringMap : Map.S = Map.Make(String)
  and Symbols : sig
    type t =
      | IVal of int
      | StrVal of string
      | SymTableVal of t StringMap.t
  end = struct
    type t =
      | IVal of int
      | StrVal of string
      | SymTableVal of t StringMap.t
  end;;
module rec StringMap : Map.S
and Symbols :
  sig
    type t = IVal of int | StrVal of string | SymTableVal of t StringMap.t
  end

HTH.

-- 
Dr Jon D Harrop, Flying Frog Consultancy Ltd.
Objective CAML for Scientists
http://www.ffconsultancy.com/products/ocaml_for_scientists