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Note that function symbols are preferred in `add-hook'

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* lisp/subr.el (add-hook): Note that FUNCTION should preferably be
a symbol (bug#47992).
This commit is contained in:
Lars Ingebrigtsen 2021-05-03 10:45:30 +02:00
parent 81fc95bf22
commit eddb00c5bf
1 changed files with 9 additions and 3 deletions
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12
lisp/subr.el
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@ -1815,9 +1815,15 @@ This makes the hook buffer-local, and it makes t a member of the
buffer-local value. That acts as a flag to run the hook
functions of the global value as well as in the local value.
HOOK should be a symbol, and FUNCTION may be any valid function. If
HOOK is void, it is first set to nil. If HOOK's value is a single
function, it is changed to a list of functions."
HOOK should be a symbol. If HOOK is void, it is first set to
nil. If HOOK's value is a single function, it is changed to a
list of functions.
FUNCTION may be any valid function, but it's recommended to use a
function symbol and not a lambda form. Using a symbol will
ensure that the function is not re-added if the function is
edited, and using lambda forms may also have a negative
performance impact when running `add-hook' and `remove-hook'."
(or (boundp hook) (set hook nil))
(or (default-boundp hook) (set-default hook nil))
(unless (numberp depth) (setq depth (if depth 90 0)))