From: Michael Heerdegen <michael_heerdegen@web.de>
To: Emacs Development <emacs-devel@gnu.org>
Subject: Why is FUNC in cl-callf not allowed to be an expression?
Date: Thu, 09 May 2019 23:52:14 +0200 [thread overview]
Message-ID: <874l631ek1.fsf@web.de> (raw)
Hello,
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.
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.
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)))
Example:
(let ((l (list 1 2)))
(gv-callf (append l (list 3 4)))
l)
=> (1 2 3 4)
(let ((l (list (list 'c 'd))))
(gv-callf (append (list 'a 'b) (car l) (list 'e 'f)) 2)
l)
=> ((a b c d e f))
That's simpler than current cl-callf, unites cl-callf and cl-callf2 in
something more general, and even eldoc still works in the CALL.
Michael.
next reply other threads:[~2019-05-09 21:52 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-09 21:52 Michael Heerdegen [this message]
2019-05-10 0:47 ` Why is FUNC in cl-callf not allowed to be an expression? Stefan Monnier
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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