From: Nordlöw <per.nordlow@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Checking if a function is built-in
Date: Tue, 10 Jun 2008 16:11:22 -0700 (PDT) [thread overview]
Message-ID: <c29aae9e-26df-4126-86cd-ce7696fe2754@8g2000hse.googlegroups.com> (raw)
In-Reply-To: mailman.13025.1213138324.18990.help-gnu-emacs@gnu.org
On 11 Juni, 00:51, "Drew Adams" <drew.ad...@oracle.com> wrote:
> > > > 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).
Great!
Now I got it!
Many Thanks,
Nordlöw
prev parent reply other threads:[~2008-06-10 23:11 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
[not found] ` <mailman.13025.1213138324.18990.help-gnu-emacs@gnu.org>
2008-06-10 23:11 ` Nordlöw [this message]
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