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;;;; units/unit.lisp
(in-package #:wheelwork)
(defclass/std unit ()
((cached-application :a)
(container :with :a)))
(defmethod (setf closer-mop:slot-value-using-class) :after
(newval class (unit unit) slot)
(case (closer-mop:slot-definition-name slot)
(container
(setf (cached-application unit) nil))))
(defun app-of-unit (unit)
"Returns the APPLICATION instance, if any, of which this UNIT is a
part. NIL indicates that the unit has not been added to any container
in this application."
(or (cached-application unit)
(setf (cached-application unit)
(labels ((rec (u)
(when-let (c (unit-container u))
(etypecase c
(application c)
(unit (rec c))
(null nil)))))
(rec unit)))))
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