From: "Drew Adams" <drew.adams@oracle.com>
To: "'Tom Rauchenwald'"
<sehnsucht.nach.unendlichkeit@quantentunnel.de>,
<help-gnu-emacs@gnu.org>
Subject: RE: canonical name ending "-p"
Date: Fri, 18 Mar 2011 11:31:44 -0700 [thread overview]
Message-ID: <4C9FBB09BB6746F1B6B849FF8FBBEC49@us.oracle.com> (raw)
In-Reply-To: <877hbw9tp4.fsf@sec.modprobe.de>
> It means predicate. Functions ending in -p return either t
> or nil, and variables ending in -p contain either t or nil.
Actually, either non-nil (true) or nil (false).
"Boolean" in Lisp can mean this or it can mean strictly `t' or `nil'.
Generally, any non-nil value is taken to mean true, but for `defcustom' the
:type `boolean' limits the value to t or nil.
Also, most people do _not_ use `-p' when naming a boolean variable. I use it
that way quite often, but some Emacs developers frown on this use.
For user options, some people (including me) use the suffix `-flag' for a
boolean option. I tend to use `-p' for internal variables (non-options).
next prev parent reply other threads:[~2011-03-18 18:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-18 17:39 canonical name ending "-p" ken
2011-03-18 18:11 ` Allan Gottlieb
2011-03-18 18:18 ` Perry Smith
2011-03-18 18:31 ` Drew Adams
2011-03-18 18:20 ` Tom Rauchenwald
2011-03-18 18:31 ` Drew Adams [this message]
[not found] ` <mailman.12.1300472466.7441.help-gnu-emacs@gnu.org>
2011-03-19 1:52 ` Stefan Monnier
[not found] <mailman.8.1300470004.7441.help-gnu-emacs@gnu.org>
2011-03-18 17:56 ` Pascal J. Bourguignon
2011-03-18 20:36 ` Evans Winner
2011-03-19 4:32 ` rusi
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