gistfile1.lisp

(defclass random-world (world)
  ((initial-random-state :initarg :initial-random-state :accessor initial-random-state))
  (:default-initargs :initial-random-state (make-random-state t)))

(defmethod shared-initialize :after ((world random-world) slot-names &rest initargs &key)
  (declare (ignore slot-names initargs))
  (let ((*random-state* (make-random-state (initial-random-state world))))
    ;; Add random objects to the world
    ))

(defmethod reinitialize-instance :before ((world random-world) &rest initargs)
  (declare (ignore initargs))
  (clear-objects world)) ; tbd

(defun random-worlds-generator (n)
  (let ((worlds (map-into (make-array n) (lambda () (make-instance 'random-world)))))
    (lambda (index)
      (reinitialize-instance (aref worlds (mod index n))))))