From: Dario Teixeira <darioteixeira@yahoo.com>
To: Jacques Carette <carette@mcmaster.ca>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Phantom types: transparency vs rogue unification
Date: Wed, 25 Jun 2008 09:29:48 -0700 (PDT) [thread overview]
Message-ID: <522359.38196.qm@web54605.mail.re2.yahoo.com> (raw)
In-Reply-To: <48625DED.7080704@mcmaster.ca>
> Note that I would personally implement Stringies_IO a
> Functor over
> Stringies rather than having explicit dependencies.
>
Hi,
Indeed! In the meantime I've also thought of a functor-based solution,
which does the job even though it looks rather contrived:
_________________________________________________________
module type PARSER =
sig
val parse: string -> float
end
module type STRINGIES =
sig
type 'a t
val make: float -> string t
val add: string t -> string t -> string t
val parse: string -> string t
end
module Stringies (Parser : PARSER): STRINGIES =
struct
type 'a t = float
let make x = x
let add a b = a +. b
let parse = Parser.parse
end
module Myparser : PARSER =
struct
let parse = float_of_string
end
module Mystringies = Stringies (Myparser)
open Mystringies
let ola = add (make 1.0) (make 2.0);;
let ola = add (make 1.0) 2.0;; (* Error *)
_________________________________________________________
Thanks for your time!
Cheers,
Dario Teixeira
__________________________________________________________
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next prev parent reply other threads:[~2008-06-25 16:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-25 14:26 Dario Teixeira
2008-06-25 15:02 ` [Caml-list] " Jacques Carette
2008-06-25 16:29 ` Dario Teixeira [this message]
2008-06-26 21:41 ` Dario Teixeira
2008-06-27 20:35 ` Dario Teixeira
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