From: Olaf Rogalsky <olaf.rogalsky@aol.de>
To: "Pascal J. Bourguignon" <pjb@informatimago.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: understanding backquote
Date: Wed, 03 Jun 2015 01:00:30 +0200 [thread overview]
Message-ID: <87k2vllnqp.fsf@aol.de> (raw)
In-Reply-To: <87oakx513l.fsf@kuiper.lan.informatimago.com>
>> I have problems in understanding the semantics of backquote. Consider
...
> (info "(elisp) Backquote")
Yes, I read that, but the manual does not make it entirly clear, at
which time comma expressions are evaluated: at read or at compile-time:
9.4 Backquote
...
The special marker ‘,’ inside of the argument to backquote indicates a
value that isn’t constant. The Emacs Lisp evaluator evaluates the
argument of ‘,’, and puts the value in the list structure:
...
> Now, the fact that you obtain a simple constant function is unrelated
> to the backquote, but comes from the fact that you have a good and smart
> compiler, that notices that the expression is a constant expression, and
> therefore it is reduced at compilation time:
Thanks for the confirmation, I already suspected this.
Olaf
next prev parent reply other threads:[~2015-06-02 23:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-02 13:28 gtags-find-tag and gtags-find-rtag in C-code Peter Münster
2015-06-02 15:06 ` Eli Zaretskii
2015-06-02 16:01 ` Peter Münster
2015-06-02 16:13 ` Eli Zaretskii
2015-06-02 19:09 ` Dmitry Gutov
2015-06-02 20:34 ` Peter Münster
2015-06-02 19:17 ` understanding backquote Olaf Rogalsky
2015-06-03 11:05 ` Nicolas Richard
[not found] ` <mailman.4231.1433345880.904.help-gnu-emacs@gnu.org>
2015-06-03 18:53 ` Stefan Monnier
[not found] ` <mailman.4175.1433272668.904.help-gnu-emacs@gnu.org>
2015-06-02 20:03 ` Pascal J. Bourguignon
2015-06-02 23:00 ` Olaf Rogalsky [this message]
2015-06-03 10:40 ` Nicolas Richard
[not found] ` <mailman.4191.1433286041.904.help-gnu-emacs@gnu.org>
2015-06-02 23:08 ` Pascal J. Bourguignon
2015-06-02 21:22 ` Barry Margolin
2015-06-02 22:53 ` Olaf Rogalsky
[not found] ` <mailman.4189.1433285612.904.help-gnu-emacs@gnu.org>
2015-06-02 23:07 ` Pascal J. Bourguignon
2015-06-02 23:54 ` Olaf Rogalsky
[not found] ` <mailman.4193.1433289260.904.help-gnu-emacs@gnu.org>
2015-06-03 1:14 ` Stefan Monnier
2015-06-03 7:57 ` Olaf Rogalsky
2015-06-03 10:23 ` Olaf Rogalsky
2015-06-03 2:37 ` Pascal J. Bourguignon
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