From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Subject: Re: Why is FUNC in cl-callf not allowed to be an expression?
Date: Thu, 09 May 2019 20:47:48 -0400 [thread overview]
Message-ID: <jwvbm0bb14w.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: 874l631ek1.fsf@web.de
> I wonder why the FUNC argument in cl-callf is restricted to symbols (and
> lambda expressions, though this is not documented). I don't see any
> reason to disallow arbitrary expressions, besides, maybe, that symbols
> would become ambiguous.
`callf` has been in cl.el "for ever" but it's not in Common-Lisp, so
I don't really know where it comes from. I agree that when I moved it
to cl-lib, I missed an opportunity to fix it and make it take a normal
expression as first argument.
> I really would like to have an gv-callf that would simply interpret the
> function argument as an expression. cl-callf just saves the programmer
> from typing the #' but forbids many use cases.
FWIW, you can circumvent this with
(cl-flet ((f <EXPR>))
(cl-callf f ...))
> I think I would even like it most like this:
>
> (defmacro gv-callf (call &optional n)
> (gv-letplace (_getter setter) (nth (or n 1) call)
> (funcall setter call)))
It's cute, tho I'm not too fond of specifying the place via a number,
personally,
Stefan
next prev parent reply other threads:[~2019-05-10 0:47 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-09 21:52 Why is FUNC in cl-callf not allowed to be an expression? Michael Heerdegen
2019-05-10 0:47 ` Stefan Monnier [this message]
2019-05-10 11:32 ` Michael Heerdegen
2019-05-10 13:28 ` Stefan Monnier
2019-05-10 14:19 ` Stefan Monnier
2019-05-10 14:22 ` Stefan Monnier
2019-05-10 15:18 ` Michael Heerdegen
2019-05-13 16:47 ` Stefan Monnier
2019-05-14 12:36 ` Michael Heerdegen
2019-05-14 23:32 ` Michael Heerdegen
2019-05-15 2:02 ` Stefan Monnier
2019-05-15 16:38 ` Michael Heerdegen
2019-05-15 17:19 ` Michael Heerdegen
2019-05-16 2:18 ` Michael Heerdegen
2019-05-16 13:12 ` Stefan Monnier
2019-05-16 14:37 ` Michael Heerdegen
2019-05-16 15:09 ` Michael Heerdegen
2019-05-16 19:34 ` Stefan Monnier
2019-05-16 21:46 ` Michael Heerdegen
2019-05-16 23:06 ` Stefan Monnier
2019-05-17 22:53 ` Michael Heerdegen
2019-05-18 14:09 ` Stefan Monnier
2019-05-20 23:25 ` Michael Heerdegen
2019-05-21 2:01 ` Stefan Monnier
2019-05-21 2:47 ` Michael Heerdegen
2019-05-21 10:16 ` Noam Postavsky
2019-05-21 16:38 ` Michael Heerdegen
2019-05-21 17:38 ` Stefan Monnier
2019-05-21 7:26 ` Andy Moreton
2019-05-23 23:02 ` Michael Heerdegen
2019-05-22 1:00 ` Michael Heerdegen
2019-05-23 1:50 ` Michael Heerdegen
2019-05-23 3:38 ` Stefan Monnier
2019-05-23 23:38 ` Michael Heerdegen
2019-05-24 15:29 ` Stefan Monnier
2019-05-28 19:54 ` Michael Heerdegen
2019-05-27 0:20 ` Michael Heerdegen
2019-05-29 17:02 ` Stefan Monnier
2019-05-15 19:17 ` Michael Heerdegen
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