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* 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


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?


Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <>.
Support Org development at <>,
or support my work at <>

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