+
+
+;;;; Convenient macros
+
+(defmacro def-callback-marshal (name (return-type &rest args))
+ (let ((names (loop
+ for arg in args
+ collect (if (atom arg) (gensym) (first arg))))
+ (types (loop
+ for arg in args
+ collect (if (atom arg) arg (second arg)))))
+ `(defcallback ,name (,return-type ,@(mapcar #'list names types)
+ (callback-id unsigned-int))
+ (invoke-callback callback-id ',return-type ,@names))))
+
+(defmacro with-callback-function ((id function) &body body)
+ `(let ((,id (register-callback-function ,function)))
+ (unwind-protect
+ (progn ,@body)
+ (destroy-user-data ,id))))
+
+