From: Alain Frisch <alain@frisch.fr>
To: Till Varoquaux <till.varoquaux@gmail.com>
Cc: Caml List <caml-list@inria.fr>
Subject: Re: [Caml-list] Circuralizing lists
Date: Mon, 26 Nov 2007 22:58:31 +0100 [thread overview]
Message-ID: <474B4187.8040301@frisch.fr> (raw)
In-Reply-To: <9d3ec8300711261346r4b74f5gddce229324dcad2c@mail.gmail.com>
Till Varoquaux wrote:
> Writing the list containing an inifinite number of ones can easily be done as:
>
> let rec ones = 1::ones
>
> I however don't know of any type safe to generate the infinite list
> which is the repetition of a given list (in a type safe non lazy way).
> What I'm looking for is a code that would do:
>
> let circularize = function
> | [] -> failwith "cannot circularize empty lists"
> | l -> let rec res = l@res in res
>
> Is this at all possible?
No, this is not possible (using only safe features). The only recursive
(non functional) value loops that can be built have a fixed shape.
-- Alain
next prev parent reply other threads:[~2007-11-26 22:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-26 21:46 Till Varoquaux
2007-11-26 21:58 ` Alain Frisch [this message]
2007-11-26 22:41 ` [Caml-list] " Jon Harrop
2007-12-20 21:04 ` David Thomas
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