From: "Nicolas Pouillard" <nicolas.pouillard@gmail.com>
To: "Christoph Bauer" <christoph.bauer@lms-gmbh.de>
Cc: caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] Streams and call-by-need
Date: Fri, 26 May 2006 17:17:36 +0200 [thread overview]
Message-ID: <cd67f63a0605260817q56fdc2bew33f0e7ddc5546eca@mail.gmail.com> (raw)
In-Reply-To: <26EB47FDD566A7469FC862DAF373792F013FE579@kaiserslautern1.lmsintl.com>
On 5/26/06, Christoph Bauer <christoph.bauer@lms-gmbh.de> wrote:
> Hi,
>
> do streams support call-by-need? This looks like call-by-name:
>
> # let s = [< '(print_endline "a"); '(print_endline "b") >]
> ;;
> val s : unit Stream.t = <abstr>
> # let t = [< s; s >]
> ;;
> val t : unit Stream.t = <abstr>
> # Stream.next t;;
> a
> - : unit = ()
> # Stream.next t;;
> b
> - : unit = ()
> # Stream.next t;;
> a
> - : unit = ()
> # Stream.next t;;
> b
> - : unit = ()
>
Since your stream elements make function calls they are boxed in
functions taking unit.
Thus calls are delayed, but that's not real lazy values, the function
call is always done.
--
Nicolas Pouillard
prev parent reply other threads:[~2006-05-26 15:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-26 14:52 Christoph Bauer
2006-05-26 15:17 ` Nicolas Pouillard [this message]
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