From: Ceri Storey <cez@pkl.net>
To: Ryan Tarpine <rtarpine@hotmail.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Allowing many types
Date: Mon, 11 Feb 2002 10:53:06 +0000 [thread overview]
Message-ID: <20020211105306.GC11294@mandelbrot.house> (raw)
In-Reply-To: <F128d3OJXsNQptgFrYI00015ae5@hotmail.com>
On Sun, Feb 10, 2002 at 08:43:20PM -0500, Ryan Tarpine wrote:
> Is there a type that means "any polymorphic variant"? Trying to set
> type primitive = [ `PTest ]
> forces only `PTest to be the value of object_data. How can I allow
> anything to be stored there?
According to the output of the toplevel, then the type [> `Foo | `Bar ]
should be usable, but alas, it is not allowable in type specifictions,
giving "Unbound type parameter [..]".
I've also tried just using plain tuples for this, but then lots of types
become ungeneralisable, eg in the trivial example:
# List.map (fun x -> x) [`X; `Y; `Z];;
- : _[> `X | `Y | `Z] list = [`X; `Y; `Z]
So say, declaring such a variable in a complied module is impossible
(AFAIK).
Thanks...
--
Ceri Storey <cez@pkl.net> http://pkl.net/~cez/
vi(1)! postfix(7)! pie(5)!
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next prev parent reply other threads:[~2002-02-11 10:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-11 1:43 Ryan Tarpine
2002-02-11 10:53 ` Ceri Storey [this message]
2002-02-11 11:48 ` Remi VANICAT
-- strict thread matches above, loose matches on Subject: below --
2002-02-08 2:29 Ryan Tarpine
2002-02-08 16:37 ` Ceri Storey
2002-02-08 16:53 ` Remi VANICAT
2002-02-10 17:42 ` Ceri Storey
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