From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
To: jim@farrand.net
Cc: caml-list@pauillac.inria.fr
Subject: Re: [Caml-list] Polymorphic Variants and Objects
Date: Thu, 20 Dec 2001 11:07:32 +0900 [thread overview]
Message-ID: <20011220110732T.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: <200112181411.30786@farrand.net>
From: Jim Farrand <jim@farrand.net>
> Take a look at the following OCaml class type definition:
>
> class type foo =
> object
> method bar: [ `A | `B ]
> end
>
> I want to be able to relax the type of bar so that it can return any variant
> tag, rather than being limited to `A or `B.
What about:
class type ['a] foo =
object
constraint 'a = [> `A | `B]
method bar : 'a
end
Since you want the variant to be polymorphic, you have to bind its
variable somewhere.
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Jacques Garrigue Kyoto University garrigue at kurims.kyoto-u.ac.jp
<A HREF=http://wwwfun.kurims.kyoto-u.ac.jp/~garrigue/>JG</A>
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next prev parent reply other threads:[~2001-12-20 2:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-18 14:37 Jim Farrand
2001-12-20 2:07 ` Jacques Garrigue [this message]
2001-12-20 9:44 ` Jim Farrand
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