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Sender: Ivan Gotovchits <lambda.q.q@gmail.com>
From: Ivan Gotovchits <ivg@ieee.org>
To: William Smith <bills@emu-bark.com>
Cc: Caml-list <caml-list@inria.fr>
References: <516236E1.7090102@emu-bark.com>
Date: Mon, 08 Apr 2013 07:57:49 +0400
In-Reply-To: <516236E1.7090102@emu-bark.com> (William Smith's message of "Sun,
	07 Apr 2013 23:17:53 -0400")
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Subject: Re: [Caml-list] Declaring a parameterized type in a .mli

William Smith <bills@emu-bark.com> writes:


> module Id = GenericID( IDRoot )
Compiler is right =) You can't do this in a module type specification. 

Though you can define a signature of your module in some *.ml file and
use it later in your module type declaration.

For example:

<file sig.ml>:
   module type Id = sig
       type t
       val compare : t -> t -> int
       val to_string : t -> string
       val cons : unit -> t
   end

   module type Root = sig ... end



<file  genericId.mli>
   open Sig
   module Make(Root:Root): Id

   module DefaultId : Id
   
-- 
         (__) 
         (oo) 
   /------\/ 
  / |    ||   
 *  /\---/\ 
    ~~   ~~   
...."Have you mooed today?"...