place—a place.
indicator—an object.
generalized-boolean—a generalized boolean.
remf
removes from the property list stored in place
a property1 with a property indicator
identical to indicator.
If there are multiple properties1 with the identical key,
remf
only removes the first such property.
remf
returns false if no such property was found,
or true if a property was found.
The property indicator
and the corresponding property value
are removed in an undefined order
by destructively splicing the property list.
remf
is permitted to either setf
place or to
setf
any part, car
or cdr
,
of the list structure held by that place.
For information about the evaluation of subforms of place, see Section 5.1.1.1 (Evaluation of Subforms to Places).
(setq x (cons () ())) → (NIL) (setf (getf (car x) 'prop1) 'val1) → VAL1 (remf (car x) 'prop1) → true (remf (car x) 'prop1) → false
The property list stored in place is modified.