-
-(defvar *registered-stable-pointers* (make-array 0 :adjustable t :fill-pointer t))
-
-(defun allocate-stable-pointer (thing)
- (let ((id (find-fresh-id)))
- (setf (aref *registered-stable-pointers* id) thing)
- (make-pointer id)))
-
-(defun free-stable-pointer (stable-pointer)
- (setf (aref *registered-stable-pointers* (pointer-address stable-pointer)) nil))
-
-(defun get-stable-pointer-value (stable-pointer)
- (aref *registered-stable-pointers* (pointer-address stable-pointer)))
-
-(defun find-fresh-id ()
- (or (position nil *registered-stable-pointers*)
- (progn (vector-push-extend nil *registered-stable-pointers*)
- (1- (length *registered-stable-pointers*)))))
-
-(defmacro with-stable-pointer ((ptr expr) &body body)
- `(let ((,ptr (allocate-stable-pointer ,expr)))
- (unwind-protect
- (progn ,@body)
- (free-stable-pointer ,ptr))))
\ No newline at end of file