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Re: never use `eval' (was: Re: How to mapcar or across a list?)
From: |
Barry Margolin |
Subject: |
Re: never use `eval' (was: Re: How to mapcar or across a list?) |
Date: |
Wed, 15 Jul 2015 20:01:55 -0400 |
User-agent: |
MT-NewsWatcher/3.5.3b3 (Intel Mac OS X) |
In article <mailman.6982.1437001117.904.help-gnu-emacs@gnu.org>,
Emanuel Berg <embe8573@student.uu.se> wrote:
> "Pascal J. Bourguignon" <pjb@informatimago.com>
> writes:
>
> > It's always a bad idea to use eval, because eval
> > evalutes in the nil environment, not in the local
> > lexical envrionment.
>
> I have used `eval' eight times in my current setup of
> 75 files.
>
> Tho some of this code I wrote several years ago, I'd
> be happy to correct it. Any hints - general or
> specific - are appreciated.
>
> ;; From: http://user.it.uu.se/~embe8573/conf/emacs-init/faces.el
>
> (defun set-color-face (name front &optional bold back)
> (eval `(defvar ,(make-symbol name)))
> (eval `(setq ,(intern name)
> `((t (:foreground ,front
> :background ,back
> :bold ,bold) )))))
(eval `(setq ,<expr> <val>))
can practically always be replaced with:
(setf (symbol-value <expr>) <val>)
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
- Re: How to mapcar or across a list?, (continued)
- Re: How to mapcar or across a list?, John Mastro, 2015/07/15
- Re: How to mapcar or across a list?, Emanuel Berg, 2015/07/15
- Message not available
- Re: How to mapcar or across a list?, Pascal J. Bourguignon, 2015/07/15
- Re: How to mapcar or across a list?, Emanuel Berg, 2015/07/15
- never use `eval' (was: Re: How to mapcar or across a list?), Emanuel Berg, 2015/07/15
- Re: never use `eval' (was: Re: How to mapcar or across a list?), John Mastro, 2015/07/15
- Re: never use `eval' (was: Re: How to mapcar or across a list?), Emanuel Berg, 2015/07/15
- Re: never use `eval' (was: Re: How to mapcar or across a list?), John Mastro, 2015/07/15
- Message not available
- Re: never use `eval' (was: Re: How to mapcar or across a list?), Barry Margolin, 2015/07/15
- Message not available
- Re: never use `eval' (was: Re: How to mapcar or across a list?),
Barry Margolin <=
- Re: never use `eval' (was: Re: How to mapcar or across a list?), Emanuel Berg, 2015/07/15
- Re: never use `eval' (was: Re: How to mapcar or across a list?), Emanuel Berg, 2015/07/16
- Message not available
- Re: never use `eval', Pascal J. Bourguignon, 2015/07/16
- Re: never use `eval', Emanuel Berg, 2015/07/16
- Re: never use `eval', Barry Margolin, 2015/07/17
- Re: never use `eval', Pascal J. Bourguignon, 2015/07/17
- Message not available
- Re: never use `eval', Pascal J. Bourguignon, 2015/07/15
- Re: never use `eval', Emanuel Berg, 2015/07/15
Re: How to mapcar or across a list?, Pascal J. Bourguignon, 2015/07/15