From: Eli Zaretskii <eliz@is.elta.co.il>
Cc: emacs-devel@gnu.org
Subject: Re: variable type
Date: Thu, 7 Mar 2002 13:14:16 +0200 (IST) [thread overview]
Message-ID: <Pine.SUN.3.91.1020307131143.10175E@is> (raw)
In-Reply-To: <20020307.084637.59481548.wl@gnu.org>
[Redirected to emacs-devel, where these issues should be discussed.]
On Thu, 7 Mar 2002, Werner LEMBERG wrote:
> How shall I define a variable which has the following properties:
>
> If nil, don't use it.
> If t, use value 0.
> If a positive integer, use it.
>
> My idea is to represent this in C as an integer where nil maps to -1.
I'd define it as a Lisp_Object, and then use NATNUMP, STRINGP, NILP, etc.
to see what its type and extract the value. Emacs sources do that quite
a lot.
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parent reply other threads:[~2002-03-07 11:14 UTC|newest]
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[parent not found: <20020307.084637.59481548.wl@gnu.org>]
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