From: Nicolas Petton <nicolas@petton.fr>
To: Michael Heerdegen <michael_heerdegen@web.de>,
Emacs Development <emacs-devel@gnu.org>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: Stream implementation of seq-mapn
Date: Mon, 18 Dec 2017 13:32:17 +0100 [thread overview]
Message-ID: <87po7crzce.fsf@petton.fr> (raw)
In-Reply-To: <87lgi0fdt3.fsf@web.de>
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Michael Heerdegen <michael_heerdegen@web.de> writes:
Hi Michael,
> [...]
> +(cl-defmethod seq-mapn (function (stream stream) &rest streams)
> + "Map FUNCTION over the STREAMS.
I would add to the docstring that all elements of `streams' should be
streams, otherwise it will default to the generic implementation.
> +
> +Example: this prints the first ten Fibonacci numbers:
> +
> + (letrec ((fibs (stream-cons
> + 1
> + (stream-cons
> + 1
> + (seq-mapn #'+ fibs (stream-rest fibs))))))
> + (seq-do #'print (seq-take fibs 10)))
> +
> +\(fn FUNCTION STREAMS...)"
> + (if (not (cl-every #'streamp streams))
^^^^^^^^
Since this is for stream.el, why not use `seq-every-p'?
> + (cl-call-next-method)
> + (cl-callf2 cons stream streams)
> + (stream-make
> + (unless (cl-some #'seq-empty-p streams)
^^^^^^^
Same question :-)
> [...]
> (1) Is it ok to implement it with `cl-call-next-method' this way?
I guess it is. Have you tried running `seq-mapn' with a mix of streams
and lists?
Cheers,
Nico
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next prev parent reply other threads:[~2017-12-18 12:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-18 11:58 Stream implementation of seq-mapn Michael Heerdegen
2017-12-18 12:32 ` Nicolas Petton [this message]
2017-12-18 12:51 ` Michael Heerdegen
2017-12-18 13:50 ` Nicolas Petton
2017-12-19 13:05 ` Michael Heerdegen
2017-12-19 14:08 ` Nicolas Petton
2017-12-26 22:09 ` Michael Heerdegen
2017-12-29 9:04 ` Nicolas Petton
2017-12-30 14:28 ` Michael Heerdegen
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