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Re: general lazy list facility for Emacs Lisp?

From: Ted Zlatanov
Subject: Re: general lazy list facility for Emacs Lisp?
Date: Wed, 23 Mar 2011 15:33:44 -0500
User-agent: Gnus/5.110016 (No Gnus v0.16) Emacs/24.0.50 (gnu/linux)

On Wed, 23 Mar 2011 19:27:54 +0100 Thierry Volpiatto <address@hidden> wrote: 

TV> Ted Zlatanov <address@hidden> writes:
>> On Wed, 23 Mar 2011 18:46:16 +0100 Thierry Volpiatto <address@hidden> wrote: 
TV> Not sure to understand what you want, but maybe have a look at some
TV> ioccur.el functions:
ELISP> (setq A '(a b c d))
TV> (a b c d)
ELISP> (setq it (ioccur-iter-circular A))
>> That's useful but I was thinking more of infinite lists,
TV> In this case ioccur-iter-circular produce infinite list.

Hmm, it's not really what I had in mind, although it's certainly
useful...  The ioccur.el code returns an iterator across an existing
collection.  I need the next element dynamically generated, not
retrieved from a pre-existing collection.  The idea is to avoid the
memory and CPU usage until you know you need the data.  

I think Tassilo's macro or something similar with closures is closer to
my need and the general meaning of "lazy lists."


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