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(defclass message-class (standard-class) ()) (defmethod print-object ((object message-class) stream) (print-unreadable-object (object stream :type t :identity t) (prin1 (class-name object) stream))) (defmethod c2mop:validate-superclass ((c message-class) (s standard-class)) t) (defmethod c2mop:validate-superclass ((c standard-class) (s message-class)) t) (defvar *message-classes* (make-hash-table :test #'equal)) (defun find-message-class (name) (assert (and (listp name) (every #'symbolp name)) (name) "NAME must be a list of symbols, not ~S." name) (values (gethash name *message-classes*))) (defun (setf find-message-class) (new-value name) (assert (and (listp name) (every #'symbolp name)) (name) "NAME must be a list of symbols, not ~S." name) (assert (typep new-value '(or class null)) (new-value) "NEW-VALUE must be a class metaobject or NIL, not ~S." new-value) (if new-value (setf (gethash name *message-classes*) new-value) (remhash name *message-classes*))) (defmacro define-message-class (name direct-superclasses direct-slots &rest options) (let ((gensym (gensym))) `(unwind-protect (progn (setf (find-class ',gensym) (find-message-class ',name)) (defclass ,gensym ,direct-superclasses ,direct-slots (:metaclass message-class) ,@options) (setf (find-message-class ',name) (find-class ',gensym)) (find-class ',gensym)) (let ((class (find-class ',gensym))) (setf (find-class ',gensym) nil) (setf (class-name class) ',name))))) CL-USER> (define-message-class (foo bar) () ()) #<MESSAGE-CLASS (FOO BAR) {1003B8EA63}> CL-USER> (find-message-class '(foo bar)) #<MESSAGE-CLASS (FOO BAR) {1003B8EA63}> CL-USER> (make-instance *) #<#<MESSAGE-CLASS (FOO BAR) {1003B8EA63}> {1003C24793}>