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From: Damien Mattei <damien.mattei@gmail.com>
To: guile-user <guile-user@gnu.org>
Subject: Re: escaping from a recursive call
Date: Wed, 9 Nov 2022 18:18:39 +0100	[thread overview]
Message-ID: <CADEOadeiDXwvhci1HoKfdj2Ezq5nvorzAoRNMB181ghoPy2C7w@mail.gmail.com> (raw)
In-Reply-To: <8735asoytw.fsf@laura>

but in the general case  , i want a macro that can do it on any function
(i'm not sure it can be done because the continuation have to be captured
just before the call to the function and be inlined at the good place....)

On Wed, Nov 9, 2022 at 5:52 PM Olivier Dion <olivier.dion@polymtl.ca> wrote:

> On Wed, 09 Nov 2022, Damien Mattei <damien.mattei@gmail.com> wrote:
> > i need a way to escape not only the current call of a recursive function
> > (it is already done) but alls:
> >
> > example:
> >
> > (def (foo n)
> >      (cond ((= n 0) 'end0)
> >   ((= n 7) (return 'end7))
> >   (else (cons n (foo {n - 1})))))
>
> Is that what you want?
> --8<---------------cut here---------------start------------->8---
> (use-modules
>  (ice-9 control))
>
> (define (foo n)
>   (let/ec return
>     (let loop ((n n))
>       (cond
>        ((= n 0) 'end0)
>        ((= n 7) (return 'end7))
>        (else
>         (cons n (loop (1- n))))))))
>
> (pk (foo 5))
> (pk (foo 10))
> --8<---------------cut here---------------end--------------->8---
>
> --
> Olivier Dion
> oldiob.dev
>


  reply	other threads:[~2022-11-09 17:18 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-09 15:56 escaping from a recursive call Damien Mattei
2022-11-09 16:51 ` Olivier Dion via General Guile related discussions
2022-11-09 17:18   ` Damien Mattei [this message]
2022-11-09 17:55     ` Olivier Dion via General Guile related discussions
2022-11-09 18:49       ` Damien Mattei
2022-11-10  1:20         ` Olivier Dion via General Guile related discussions
2022-11-10  4:56           ` tomas
2022-11-10  6:01             ` Damien Mattei
2022-11-10  5:25           ` Damien Mattei
2022-11-10 17:03             ` Olivier Dion via General Guile related discussions
2022-11-10 12:32       ` Chris Vine
2022-11-10 13:48         ` Damien Mattei
2022-11-09 18:56     ` Zelphir Kaltstahl

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