From: Tiphaine Turpin <tiphaine.turpin@free.fr>
To: caml-list@inria.fr
Subject: Re: [Caml-list] How an exception could be an argument
Date: Fri, 17 Feb 2012 20:31:34 +0100 [thread overview]
Message-ID: <4F3EAB16.7060803@free.fr> (raw)
In-Reply-To: <CANnJ5GdKgpk_E1F3B9GDS-SC3EnnvLTTOgGRgEsvbZL0S_VGag@mail.gmail.com>
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This behavior is expected given than OCaml is strict, and your operator
<|||> would be an ordinary function (unlike || and &&). You have to use
either functions (or lazy values) instead of expressions, or options
instead of exceptions.
Tiphaine
Le 17/02/2012 19:16, Pierre-Alexandre Voye a écrit :
> Hello, I'm trying to implement a scala concept "partial application"
> in which one can chains pattern matching function. If the first
> failed, the second is tried.
> It seems it is impossible to give an exception as argument to a function.
>
>
>
> exception Nothing;;
>
> let (<|||>) a b = try a
> with
>
> | Nothing -> (try b
> with
>
> | Nothing -> raise
> Nothing);;
>
> val ( <|||> ) : 'a -> 'a -> 'a = <fun>
>
>
> (raise Nothing) <|||>
> "jj";;
>
> Exception: Nothing.
>
>
> But if I try :
> try (raise Nothing)
> with
>
> | Nothing -> (try
> "jj"with
>
> | Nothing -> raise
> Nothing);;
>
> - : string = "jj"
>
> Is there a workaround ?
>
>
> Regards,
> P-A
> --
> ---------------------
> https://twitter.com/#!/ontologiae/ <https://twitter.com/#%21/ontologiae/>
> http://linuxfr.org/users/montaigne
>
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prev parent reply other threads:[~2012-02-17 18:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-17 18:16 Pierre-Alexandre Voye
2012-02-17 18:33 ` Edgar Friendly
2012-02-17 18:49 ` Vincent Aravantinos
2012-02-17 19:31 ` Tiphaine Turpin [this message]
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