From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Lexical binding and macros.
Date: Wed, 15 Dec 2010 10:40:08 -0500 [thread overview]
Message-ID: <jwvipyv11zk.fsf-monnier+gnu.emacs.help@gnu.org> (raw)
In-Reply-To: 96134923-1314-4675-bd77-004945a7159e@y3g2000vbm.googlegroups.com
> Do they still leak memory? From http://c2.com/cgi/wiki?EmacsLisp :
> "Note that variables bound with lexical-let are never released, even
> if they are never used. Try
> (loop for i from 1 to 100000 collect (lexical-let ((x i)) '()))
> and watch it eat memory. So making infinity (ZeroOneInfinity) lexical
> variables is out of the question except for very small values of
> infinity."
Additionally to what Pascal already explained, I'll add that,
lexical-let, like `loop' are relatively heavy macros, so you definitely
don't want to run them interpreted (where the macro is re-expanded each
time). If you byte-compile the code above, the memory use will
be identical to what you get with
(loop for i from 1 to 100000 collect (let ((x i)) '()))
Stefan
next prev parent reply other threads:[~2010-12-15 15:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.40.1292017369.4804.help-gnu-emacs@gnu.org>
2010-12-12 4:10 ` Lexical binding and macros Barry Margolin
2010-12-12 17:14 ` LanX
2010-12-12 17:23 ` Pascal J. Bourguignon
2010-12-15 4:24 ` Stefan Monnier
2010-12-15 9:15 ` Elena
2010-12-15 12:38 ` Pascal J. Bourguignon
2010-12-15 15:40 ` Stefan Monnier [this message]
2010-12-15 16:16 ` David Kastrup
2010-12-15 17:37 ` Pascal J. Bourguignon
2010-12-15 17:54 ` Elena
2010-12-16 21:59 ` Stefan Monnier
2010-12-10 21:42 Alin Soare
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