From: Oleg Trott <oleg_trott@columbia.edu>
To: Nick Name <nick.name@inwind.it>, caml-list@inria.fr
Subject: Re: [Caml-list] Is arrow programming impossible in ocaml?
Date: Mon, 13 Oct 2003 21:33:13 -0400 [thread overview]
Message-ID: <200310132133.13347.oleg_trott@columbia.edu> (raw)
In-Reply-To: <200310140159.20515.nick.name@inwind.it>
On Monday 13 October 2003 07:59 pm, Nick Name wrote:
> Hi all, I am trying to work on a project where I need ocaml efficiency
> with rank-2 polymorphism, if I got it correctly (I am not an expert in
> programming language semantics).
>
> Basically I am trying to reproduce FRAN-like usage of arows as in
>
> http://haskell.cs.yale.edu/yampa/AFPLectureNotes.pdf
>
> so I have defined my own arrow module etc, but I faced the rank-1
> polymorphism restriction of ocaml. I have cut down my example to:
>
> -
> type ('a,'b) t = 'a -> 'b
>
> let rec arr f = f
>
> let a = arr (fun x -> x)
> -
>
> and "a" is typed like '_a -> '_a , where I would like it to be typed 'a
> -> 'a.
I think OCaml 3.07 makes this possible
> Does anyone think I have other possibilities in writing that kind of
> higher-order combinator based code, or is it impossible?
>
> thanks
>
> Vincenzo
--
Oleg Trott <oleg_trott@columbia.edu>
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next prev parent reply other threads:[~2003-10-14 1:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-13 23:59 Nick Name
2003-10-14 1:33 ` Oleg Trott [this message]
2003-10-14 3:02 ` Jacques Garrigue
2003-10-14 11:26 ` Nick Name
2003-10-15 0:22 ` Jacques Garrigue
2003-10-15 1:53 ` Nick Name
2003-10-15 2:20 ` Jacques Garrigue
2003-10-15 11:39 ` skaller
2003-10-14 10:37 ` skaller
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