From: "Drew Adams" <drew.adams@oracle.com>
To: 'Nordlöw' <per.nordlow@gmail.com>, help-gnu-emacs@gnu.org
Subject: RE: Checking if a function is built-in
Date: Tue, 10 Jun 2008 15:51:05 -0700 [thread overview]
Message-ID: <009801c8cb4c$775632f0$0200a8c0@us.oracle.com> (raw)
In-Reply-To: <c9e0f6b3-5b4b-4493-b7e0-c959249e717e@p25g2000hsf.googlegroups.com>
> > > Is there a predicate that can check if a function is built-in?
> >
> > subrp
>
> I thought this was the way to use it (subrp 'cons)
> but it returns nil even though cons is a built-in function.
> Have I missed something?
(subrp (symbol-function 'cons))
`cons' is just a symbol. What you want to test is the function that the symbol
refers to.
This is not the value of the symbol but the value of its function cell, which is
a function (a subr, in this case).
next prev parent reply other threads:[~2008-06-10 22:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-10 21:08 Checking if a function is built-in Nordlöw
2008-06-10 21:18 ` Marc Tfardy
2008-06-10 21:46 ` Lennart Borgman (gmail)
2008-06-10 21:50 ` Drew Adams
2008-06-10 22:08 ` Drew Adams
[not found] ` <mailman.13020.1213134665.18990.help-gnu-emacs@gnu.org>
2008-06-10 22:06 ` Nordlöw
2008-06-10 22:29 ` Nordlöw
2008-06-10 22:51 ` Drew Adams [this message]
[not found] ` <mailman.13025.1213138324.18990.help-gnu-emacs@gnu.org>
2008-06-10 23:11 ` Nordlöw
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