From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: help-gnu-emacs@gnu.org
Subject: Re: Basic Emacs Lisp question
Date: Wed, 30 Apr 2008 21:36:50 +0300 [thread overview]
Message-ID: <87ej8n9ol9.fsf@kobe.laptop> (raw)
In-Reply-To: 85r6cnl5y6.fsf@lola.goethe.zz
On Wed, 30 Apr 2008 17:26:25 +0200, David Kastrup <dak@gnu.org> wrote:
>Giorgos Keramidas <keramida@ceid.upatras.gr> writes:
>>On Tue, 29 Apr 2008 17:49:19 +0200, Matthias Pfeifer <pfemat@web.de> wrote:
>>> Hello,
>>>
>>> What is the difference between
>>>
>>> (list 0 nil -1)
>>>
>>> and
>>>
>>> '(0 nil -1)
>>
>> In Common Lisp (list 0 nil -1) is required to 'cons' a new list every
>> time it is called. Quoting the list as in '(0 nil -1) is not required
>> to build a new list. In fact, in compiled code it may reuse the same
>> static object over and over again.
>
> Wrong word choice. Not "may", but "must". ' produces a list in the
> Lisp reader. Nothing may afterwards create gratuitious unannounced
> copies. So whether your code is compiled or interpreted: if it is not
> reread, no new object is created.
Ah! Many thanks for the explanation, David.
I am only beginning to grasp Lisp myself too, so I wasn't aware that
'-quoting produces the list in the reader :)
next prev parent reply other threads:[~2008-04-30 18:36 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-29 15:49 Basic Emacs Lisp question Matthias Pfeifer
2008-04-29 17:56 ` Giorgos Keramidas
2008-04-30 1:21 ` Giorgos Keramidas
2008-04-30 8:37 ` Tim X
2008-04-30 15:26 ` David Kastrup
2008-04-30 18:36 ` Giorgos Keramidas [this message]
2008-05-01 9:25 ` Johan Bockgård
2008-04-29 21:14 ` tyler
2008-04-30 8:31 ` Tim X
2008-05-05 13:38 ` tyler
-- strict thread matches above, loose matches on Subject: below --
2014-09-09 19:35 Basic emacs lisp question Ken
2014-09-09 19:52 ` Thorsten Jolitz
2014-09-09 21:05 ` Thorsten Jolitz
[not found] ` <mailman.8562.1410296811.1147.help-gnu-emacs@gnu.org>
2014-09-09 23:02 ` Emanuel Berg
[not found] ` <mailman.8561.1410292382.1147.help-gnu-emacs@gnu.org>
2014-09-09 20:07 ` Emanuel Berg
[not found] ` <874mwgv93m.fsf@gmail.com>
2014-09-09 20:44 ` Emanuel Berg
[not found] ` <87y4tsts4t.fsf@gmail.com>
2014-09-09 22:31 ` Emanuel Berg
2014-09-10 0:49 ` Robert Thorpe
2014-09-10 1:21 ` Ken
2014-09-10 6:00 ` Glyn Millington
2014-09-10 14:31 ` Ken
2014-09-10 13:12 ` Phillip Lord
2014-09-10 14:06 ` Thien-Thi Nguyen
2014-09-10 14:26 ` Stefan Monnier
2014-09-10 15:45 ` Phillip Lord
2014-09-10 16:59 ` Stefan Monnier
2014-09-11 11:10 ` Phillip Lord
2014-09-11 11:10 ` Phillip Lord
[not found] ` <mailman.8619.1410357764.1147.help-gnu-emacs@gnu.org>
2014-09-10 21:39 ` Emanuel Berg
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