unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
* defcustom :set vs. add-variable-watcher
@ 2023-01-05  8:06 Ihor Radchenko
  0 siblings, 0 replies; only message in thread
From: Ihor Radchenko @ 2023-01-05  8:06 UTC (permalink / raw)
  To: emacs-devel

Hi,

AFAIK, the traditional way to provide side effects to customization
value changes if :set option in `defcustom' definition.

However, it has been suggested [1] that one might also utilize
`add-variable-watcher' for the same purpose.

Given that many users don't actually use customize interface and instead
tend to set variables directly, `add-variable-watcher' looks like a more
reliable option compared to :set.

Are there any reasons to prefer :set over `add-variable-watcher'? Maybe
some non-obvious pitfalls?

[1] https://orgmode.org/list/87h6x8kluc.fsf@localhost

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>



^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2023-01-05  8:06 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-01-05  8:06 defcustom :set vs. add-variable-watcher Ihor Radchenko

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).