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Modifying constructor for constraint structures.
(change-constraint x
[:name <name>]
[:cond <cond>])
This is an often useful alternative to make-constraint.
We construct a new constraint structure that is a copy of
This is an ordinary
Macro:
(defmacro change-constraint (x &rest args) (std::change-aggregate 'constraint x args '((:name . constraint->name) (:cond . constraint->cond)) 'change-constraint 'remake-constraint))