From: Christophe TROESTLER <Christophe.Troestler+ocaml@umh.ac.be>
To: David.Teller@univ-orleans.fr
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Polymorphic variant as a witness?
Date: Sun, 22 Jun 2008 01:27:52 +0200 (CEST) [thread overview]
Message-ID: <20080622.012752.1098181329612502108.Christophe.Troestler+ocaml@umh.ac.be> (raw)
In-Reply-To: <1214089919.6190.13.camel@Blefuscu>
On Sun, 22 Jun 2008 01:11:59 +0200, David Teller wrote:
>
> I could have a value (let's call it "witness") with type
> [> ] ref
Why do you want it to be mutable?
> which I could "touch" into becoming
> [> `A] ref
Are you expecting to write [touch `A witness] so [witness] becomes of
type [[> `A] ref]? If you can do with an immutable [witness], then
you can write a macro to that effet (use: [let witness' = TOUCH `A
witness]). What exactly is your purpose?
Regards,
C.
next prev parent reply other threads:[~2008-06-21 23:28 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-21 23:11 David Teller
2008-06-21 23:27 ` Christophe TROESTLER [this message]
2008-06-21 23:52 ` [Caml-list] " David Teller
2008-06-23 8:13 ` Romain Bardou
2008-06-23 10:27 ` Jacques Garrigue
2008-06-27 6:00 ` David Teller
2008-06-27 6:38 ` Jacques Garrigue
2008-07-04 13:05 ` Polymorphic variant + phantom type as a witness Gleb Alexeyev
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