Modifying constructor for reference-value-null structures.
(change-reference-value-null x )
This is an often useful alternative to make-reference-value-null.
We construct a new reference-value-null structure that is a copy of
This is an ordinary
Macro:
(defmacro change-reference-value-null (x &rest args) (std::change-aggregate 'reference-value-null x args 'nil 'change-reference-value-null 'nil))