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From: Francois Pottier <Francois.Pottier@inria.fr>
To: Charles Martin <joelisp@yahoo.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] opaque polymorphism
Date: Mon, 10 Sep 2001 09:02:25 +0200	[thread overview]
Message-ID: <20010910090225.A32394@pauillac.inria.fr> (raw)
In-Reply-To: <20010907183550.30294.qmail@web9207.mail.yahoo.com>; from joelisp@yahoo.com on Fri, Sep 07, 2001 at 11:35:50AM -0700


Hello Charles,

You can write:

  foo.ml:
  type ('a, 'b, 'c) internal_t = { ... }

  type ('a, 'c) t = ('a, <some type>, 'c) internal_t

 
  foo.mli:
  type ('a, 'c) t

So ``hiding the polymorphism in 'b'' can be done, but you have to tell
the compiler which internal type should be used instead of 'b, i.e. you
have to choose <some type>. I guess the unit type will do in most
situations.

Hope this helps,

-- 
François Pottier
Francois.Pottier@inria.fr
http://pauillac.inria.fr/~fpottier/
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  reply	other threads:[~2001-09-10  7:02 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-09-07 18:35 Charles Martin
2001-09-10  7:02 ` Francois Pottier [this message]
2001-09-10 23:19   ` Phantom types (very long) (Was Re: [Caml-list] opaque polymorphism) Brian Rogoff
2001-09-11  9:44     ` Andreas Rossberg
2001-09-11 18:38     ` [Caml-list] Re: Phantom types (very long) j h woodyatt
2001-09-11 19:16       ` Brian Rogoff
2001-09-12  9:33       ` Daan Leijen
2001-09-14  8:49       ` Jacques Garrigue
2001-09-14 19:10         ` Brian Rogoff

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