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(defclass resettable-class (standard-class) ()) (defmethod c2mop:validate-superclass ((class resettable-class) (superclass standard-class)) t) (defun reset-instance (instance &rest initargs) (let* ((slots (c2mop:class-slots (class-of instance))) (names (mapcar #'c2mop:slot-definition-name slots))) (mapcar (lambda (slot) (slot-makunbound instance slot)) names) (apply #'initialize-instance instance initargs))) (defmethod initialize-instance :after ((class resettable-class) &key) (let* ((method-lambda (c2mop:make-method-lambda #'reinitialize-instance (c2mop:class-prototype (find-class 'standard-method)) '(lambda (instance &rest initargs) (apply #'reset-instance instance initargs)) nil)) (method (make-instance 'standard-method :qualifiers '() :specializers (list class) :lambda-list '(instance &rest initargs) :function (compile nil method-lambda)))) (add-method #'reinitialize-instance method))) (defclass thing () ((foo :initarg :foo :initform (random 42)) (bar :initarg :bar :initform (random 42)) (baz :initarg :baz :initform (random 42))) (:metaclass resettable-class)) CL-USER> (defparameter *thing* (make-instance 'thing)) *THING* CL-USER> (describe *thing*) #<THING {1010E7C423}> [standard-object] Slots with :INSTANCE allocation: FOO = 26 BAR = 31 BAZ = 16 ; No value CL-USER> (reinitialize-instance *thing* :bar 2222) #<THING {1010E7C423}> CL-USER> (describe *thing*) #<THING {1010E7C423}> [standard-object] Slots with :INSTANCE allocation: FOO = 39 BAR = 2222 BAZ = 36 ; No value