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