From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Tomas Hlavaty <tom@logand.com>
Cc: Arthur Miller <arthur.miller@live.com>, emacs-devel@gnu.org
Subject: Re: Partial wdired (edit just filename at the point)
Date: Mon, 22 Mar 2021 09:11:28 -0400 [thread overview]
Message-ID: <jwvzgyvuypk.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87v99kgni5.fsf@logand.com> (Tomas Hlavaty's message of "Sun, 21 Mar 2021 23:17:38 +0100")
Tomas Hlavaty [2021-03-21 23:17:38] wrote:
> On Wed 17 Mar 2021 at 22:10, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>>> + (add-hook 'before-change-functions 'wdired--preprocess-line nil t)
>> Please use #' rather than ' to quote functions (I know the rest of the
>> code here doesn't (yet), but we should move towards more systematic
>> use of #' so as to better catch obsolete functions and other issues). ]
> That is a strange advice. I would expect #' to remove the indirection
> via symbol with consequence, that redefining the named function would
> not be reflected in the original #' value.
> What is the difference between #' and ' in emacs lisp?
> Is it different from Common Lisp?
Yes, it's indeed different from Common Lisp: it doesn't have the same
effect as `symbol-function`.
In ELisp, when quoting a symbol, #' only tells Emacs that the intention
is to refer to the function by that name more than the symbol itself,
but semantically, it's almost identical to ' and almost always just
returns the symbol. The "almost" is for the exception of references to
lexically scoped functions (where #' works like in Common Lisp).
Lexically-scoped functions occur most directly via `cl-flet` and
`cl-labels`, but they can also occur more indirectly via things like
`cl-defmethod` (where `cl-call-next-method` is lexically scoped) or
`named-let` (which rely on `cl-flet` or `cl-labels` internally).
Stefan
next prev parent reply other threads:[~2021-03-22 13:11 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-16 18:23 Partial wdired (edit just filename at the point) Arthur Miller
2021-03-17 1:18 ` Stefan Monnier
2021-03-17 2:21 ` Arthur Miller
2021-03-17 2:34 ` Stefan Monnier
2021-03-17 13:58 ` Arthur Miller
2021-03-17 14:09 ` Stefan Monnier
2021-03-17 19:56 ` Arthur Miller
2021-03-17 22:40 ` Arthur Miller
2021-03-18 2:10 ` Stefan Monnier
2021-03-18 10:26 ` Arthur Miller
2021-03-18 10:32 ` Thierry Volpiatto
2021-03-18 11:00 ` Arthur Miller
2021-03-18 11:11 ` Thierry Volpiatto
2021-03-18 11:46 ` Arthur Miller
2021-03-23 23:32 ` Michael Heerdegen
2021-03-18 14:21 ` Stefan Monnier
2021-03-19 11:15 ` Arthur Miller
2021-03-19 16:18 ` Stefan Monnier
2021-03-19 20:40 ` Sv: " arthur miller
2021-03-19 21:58 ` Stefan Monnier
2021-03-20 11:23 ` Sv: " arthur miller
2021-03-21 22:17 ` Tomas Hlavaty
2021-03-22 8:12 ` tomas
2021-03-22 12:44 ` Arthur Miller
2021-03-22 14:50 ` tomas
2021-03-22 13:11 ` Stefan Monnier [this message]
2021-03-22 20:08 ` Tomas Hlavaty
2021-03-22 20:28 ` Andreas Schwab
2021-03-22 21:00 ` Stefan Monnier
2021-03-22 21:52 ` Tomas Hlavaty
2021-03-22 22:16 ` Stefan Monnier
2021-03-22 22:39 ` Tomas Hlavaty
2021-03-22 23:27 ` Andreas Schwab
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