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From: Thorsten Jolitz <tjolitz@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: defvar vs defconst
Date: Sat, 03 Aug 2013 09:43:05 +0200	[thread overview]
Message-ID: <87txj71api.fsf@gmail.com> (raw)
In-Reply-To: 87siyr78ck.fsf@ericabrahamsen.net

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> Thorsten Jolitz <tjolitz@gmail.com> writes:
>
>> Hi List,
>>
>> when you define a variable that should not be touched/set by the user of
>> your library (which is most likely a programmer), but will be frequently
>> set to a new value by your own program - would you call that a VAR or a
>> CONST?
>>
>> (defconst ...) signals "don't touch this", which seems to the right
>> thing in this case, but OTOH it is a bit strange to call something a
>> constant that not only can be changed, but will actually be changed
>> quite often.
>
> In addition to the other answers, which make perfect sense, you can also
> look in existing libraries and see what other people do. I've found that
> pretty much all "internal" variables -- last-abbrev-location,
> org-capture-current-plist, basically any variables used to preserve
> state -- are defined with defvar.

Pretty clear picture - I will use 'defvar then. Thanks to everybody. 

-- 
cheers,
Thorsten




  reply	other threads:[~2013-08-03  7:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-02  9:49 defvar vs defconst Thorsten Jolitz
2013-08-02 21:49 ` Stefan Monnier
2013-08-03  3:37 ` Eric Abrahamsen
2013-08-03  7:43   ` Thorsten Jolitz [this message]
     [not found] <mailman.2402.1375476850.12400.help-gnu-emacs@gnu.org>
2013-08-02 21:05 ` Emanuel Berg

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