From: qrczak@knm.org.pl (Marcin 'Qrczak' Kowalczyk)
To: caml-list@inria.fr
Subject: Re: [Caml-list] dynamically loading C functions
Date: 5 Mar 2001 21:24:04 GMT [thread overview]
Message-ID: <slrn9a80vk.nqi.qrczak@qrnik.zagroda> (raw)
In-Reply-To: <4.3.2.7.2.20010304235205.00dea6a0@shell16.ba.best.com>
Mon, 05 Mar 2001 12:28:26 -0800, Chris Hecker <checker@d6.com> pisze:
> - I can tell people to "cast" the 'a return type, so you'd do this:
>
> let f = (get_function "TheFunction: float -> float -> int" : float -> float -> int)
>
> but, this requires the error prone double-specification of the type,
You can provide combinators to build the type information:
val int_t : int t
val float_t : float t
val (@->) : 'a t -> 'b t -> ('a -> 'b) t
(* Begins with @ so it's right-associative :-) *)
val get_function : string -> 'a t -> 'a
let f = get_function "TheFunction" (float_t @-> float_t @-> int_t)
(I just imagined the idea in Haskell and translated implicit Haskell's type
classes into explicit OCaml's dictionary passing.)
--
__("< Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/
\__/
^^ SYGNATURA ZASTĘPCZA
QRCZAK
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next prev parent reply other threads:[~2001-03-05 21:27 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-05 20:28 Chris Hecker
2001-03-05 21:24 ` Marcin 'Qrczak' Kowalczyk [this message]
2001-03-06 0:10 ` Chris Hecker
2001-03-06 0:55 ` Chris Hecker
2001-03-06 16:48 ` Marcin 'Qrczak' Kowalczyk
2001-03-06 18:02 ` Chris Hecker
2001-03-08 8:22 ` Fabrice Le Fessant
2001-03-08 9:34 ` Chris Hecker
2001-03-09 10:54 ` Fabrice Le Fessant
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