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[Caml-list] Is arrow programming impossible in ocaml?
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Date: -- (:)
From: Oleg Trott <oleg_trott@c...>
Subject: Re: [Caml-list] Is arrow programming impossible in ocaml?
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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