+(eval-when (:compile-toplevel :load-toplevel :execute)
+ (defclass %slot-order-test-class ()
+ ((a)
+ (b)))
+ (finalize-inheritance (find-class '%slot-order-test-class))
+ (let ((slots (class-slots (find-class '%slot-order-test-class))))
+ (ecase (slot-definition-name (first slots))
+ (a)
+ (b (pushnew :mop-slot-order-reversed cl:*features*)))))
+
+(defun ordered-class-slots (class)
+ #+mop-slot-order-reversed (reverse (class-slots class))
+ #-mop-slot-order-reversed (class-slots class))
+
+(defun ordered-class-direct-slots (class)
+ "Gets an ordered list of direct class slots"
+ ;; NB: this used to return effective-slot-definitions in direct
+ ;; opposition to the function name. Not sure why
+ (setf class (to-class class))
+ #+mop-slot-order-reversed (reverse (class-direct-slots class))
+ #-mop-slot-order-reversed (class-direct-slots class))
+
+(defun find-slot-if (class predicate &optional direct? recurse?)
+ "Looks up a direct-slot-definition by name"
+ (setf class (to-class class))
+ (labels ((find-it (class)
+ (let* ((slots (if direct?
+ (ordered-class-direct-slots class)
+ (ordered-class-slots class)))
+ (it (find-if predicate slots)))
+ (or it
+ (when recurse?
+ (loop for sup in (class-direct-superclasses class)
+ for rtn = (find-it sup)
+ until rtn
+ finally (return rtn)))))))
+ (find-it class)))
+
+(defun find-slot-by-name (class slot-name &optional direct? recurse?)
+ "Looks up a direct-slot-definition by name"
+ (setf class (to-class class)
+ slot-name (to-slot-name slot-name))
+ (find-slot-if class (lambda (slot-def) (eql (to-slot-name slot-def) slot-name))
+ direct? recurse?))
+
+;; Lispworks has symbol for slot rather than the slot instance
+(defun %svuc-slot-name (slot)
+ #+lispworks slot
+ #-lispworks (slot-definition-name slot))
+
+(defun %svuc-slot-object (slot class)
+ (declare (ignorable class))
+ #+lispworks (clos:find-slot-definition slot class)
+ #-lispworks slot)
+