From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Lars Brinkhoff <lars@nocrew.org>
Cc: emacs-devel@gnu.org
Subject: Re: RFC: User-defined pseudovectors
Date: Thu, 10 Oct 2013 16:43:55 -0400 [thread overview]
Message-ID: <jwv7gdkyi0l.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <8561t5cclt.fsf@junk.nocrew.org> (Lars Brinkhoff's message of "Thu, 10 Oct 2013 18:30:38 +0200")
> (defun frob (x)
> (cond
> ((vectorp x) (frob-vector x))
> ((foop x) (frob-foo x))))
> In the case of an FFI, a wrapper may want to be able to pass a vector
> or a "struct" (something like a pseudovector) to Emacs, and have Lisp
> code be able to tell the difference.
In Elisp, such type-overlaps are common. E.g. you should first check
`functionp' before `consp' if you can accept both lists and functions.
So similarly the above code should check `foop' before `vectorp'.
Stefan
prev parent reply other threads:[~2013-10-10 20:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-10 11:22 RFC: User-defined pseudovectors Lars Brinkhoff
2013-10-10 11:29 ` Lars Brinkhoff
2013-10-10 11:40 ` Lars Brinkhoff
2013-10-10 12:52 ` Dmitry Antipov
2013-10-10 13:41 ` Dmitry Antipov
2013-10-10 16:40 ` Lars Brinkhoff
2013-10-10 14:00 ` Stefan Monnier
2013-10-10 16:30 ` Lars Brinkhoff
2013-10-10 20:42 ` Stefan Monnier
2013-10-11 6:00 ` Lars Brinkhoff
2013-10-11 12:22 ` Stefan Monnier
2013-10-12 16:01 ` User-defined record types Lars Brinkhoff
2013-10-12 18:58 ` Stefan Monnier
2013-10-18 13:39 ` Ted Zlatanov
2013-10-18 15:28 ` Stefan Monnier
2013-10-18 23:24 ` Ted Zlatanov
2013-10-19 2:09 ` Stefan Monnier
2013-10-19 2:30 ` Drew Adams
2013-10-19 11:48 ` Ted Zlatanov
2013-10-19 14:37 ` Stefan Monnier
2013-10-19 20:11 ` Ted Zlatanov
2013-10-19 21:48 ` Stefan Monnier
2013-10-10 20:43 ` Stefan Monnier [this message]
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