From: Michael Heerdegen <michael_heerdegen@web.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Delimited continuations
Date: Tue, 12 Dec 2017 15:17:46 +0100 [thread overview]
Message-ID: <87374gows5.fsf@web.de> (raw)
In-Reply-To: <jwvefo1nssc.fsf-monnier+gmane.emacs.devel@gnu.org> (Stefan Monnier's message of "Mon, 11 Dec 2017 11:47:01 -0500")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
> Things get more interesting with side-effects:
>
> (defvar fwdc nil)
> (reset (λ (p)
> (if fwdl 3
> (setq fwdc t)
> (shift p (λ (k) (k 5))))))
>
> since we end up re-computing the `if` test and hence not using the `5`
> provided to `k`. I think this case is a clear "bug" (because, IIUC,
> (shift _ (λ (k) (k v))) should be equivalent to just `v`).
Or we just don't call it continuation, which is misleading given the
suggested implementation which gives you more something like a delimited
re-execution.
Anyway, my personal opinion is to make such stuff available so that
people can experiment with it.
Michael.
next prev parent reply other threads:[~2017-12-12 14:17 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-09 9:06 Delimited continuations John Wiegley
2017-12-10 16:53 ` Michael Heerdegen
2017-12-10 19:59 ` John Wiegley
2017-12-12 14:27 ` Michael Heerdegen
2017-12-11 16:47 ` Stefan Monnier
2017-12-12 14:17 ` Michael Heerdegen [this message]
2017-12-12 22:24 ` John Wiegley
2018-01-02 18:39 ` Christopher Lemmer Webber
2018-01-02 22:29 ` John Wiegley
2018-01-03 16:01 ` Michael Heerdegen
2018-01-03 20:12 ` Stefan Monnier
2017-12-10 17:39 ` Real continuations (was: Delimited continuations) Michael Heerdegen
2017-12-11 16:16 ` Real continuations Stefan Monnier
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