GNU bug report logs - #30626
26.0.91; Crash when traversing a `stream-of-directory-files'

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Message #119 received at 30626 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Nicolas Petton <nicolas <at> petton.fr>
Cc: Noam Postavsky <npostavs <at> gmail.com>, 30626 <at> debbugs.gnu.org
Subject: Re: bug#30626: 26.0.91;
 Crash when traversing a `stream-of-directory-files'
Date: Sat, 03 Mar 2018 08:56:05 +0100

Nicolas Petton <nicolas <at> petton.fr> writes:

> I had something like the following in mind:
>
>   (cl-defstruct nstream current next-function)
>   
>   (cl-defmethod nstream-next ((stream nstream))
>     (setf (nstream-current stream) (funcall (nstream-next-function stream)
>                                             (nstream-current stream))))
>   
>   (defun nstream-range (&optional start end step)
>     (unless start (setq start 0))
>     (unless step (setq step 1))
>     (make-nstream :current start
>                   :next-function (lambda (cur)
>                            (if (equal cur end)
>                                nil
>                              (+ cur step)))))

This is an implementation of iterators, not streams.  We already have an
implementation of iterators in Emacs.


Michael.

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