Got rid of a warning about an unused variable

[clg] / glib / gboxed.lisp

;; Common Lisp bindings for GTK+ v2.x
;; Copyright 2001-2005 Espen S. Johnsen <espen@users.sf.net>
;;
;; Permission is hereby granted, free of charge, to any person obtaining
;; a copy of this software and associated documentation files (the
;; "Software"), to deal in the Software without restriction, including
;; without limitation the rights to use, copy, modify, merge, publish,
;; distribute, sublicense, and/or sell copies of the Software, and to
;; permit persons to whom the Software is furnished to do so, subject to
;; the following conditions:
;;
;; The above copyright notice and this permission notice shall be
;; included in all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

;; $Id: gboxed.lisp,v 1.20 2006-02-04 12:15:31 espen Exp $

(in-package "GLIB")


(defclass boxed (struct)
  ()
  (:metaclass struct-class))

(defmethod instance-finalizer ((instance boxed))
  (let ((location (foreign-location instance))
	(type-number (type-number-of instance)))
    #'(lambda ()
	(remove-cached-instance location)
	(%boxed-free type-number location))))


;;;; Metaclass for boxed classes

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defclass boxed-class (struct-class)
    ())

  (defmethod validate-superclass ((class boxed-class) (super standard-class))
    (subtypep (class-name super) 'boxed)))


(defmethod shared-initialize ((class boxed-class) names &key name gtype)
  (declare (ignore names))
  (call-next-method)
  (let ((class-name (or name (class-name class))))
    (unless (find-type-number class-name)
      (register-type class-name 
       (or (first gtype) (default-type-init-name class-name))))))

(defbinding %boxed-copy () pointer
  (type-number type-number)
  (location pointer))

(defbinding %boxed-free () nil
  (type-number type-number)
  (location pointer))

(defmethod reference-foreign ((class boxed-class) location)
  (%boxed-copy (find-type-number class) location))

(defmethod unreference-foreign ((class boxed-class) location)
  (%boxed-free (find-type-number class) location))


;;;; 

(defun expand-boxed-type (type-number forward-p slots)
  `(defclass ,(type-from-number type-number) (boxed)
     ,(unless forward-p
	slots)
     (:metaclass boxed-class)
     (:gtype ,(register-type-as type-number))))

(register-derivable-type 'boxed "GBoxed" 'expand-boxed-type)

;;;; Special boxed types

;; (defclass gstring (boxed)
;;   ()
;;   (:metaclass boxed-class)
;;   (:alien-name "GString"))

;; (deftype-method translate-from-alien
;;     gstring (type-spec location &optional weak-ref)
;;   `(let ((location ,location))
;;      (unless (null-pointer-p location)
;;        (prog1
;; 	   (c-call::%naturalize-c-string location)
;; 	 ,(unless weak-ref
;; 	    (unreference-alien type-spec location))))))

;; (deftype-method translate-to-alien
;;     gstring (type-spec string &optional weak-ref)
;;   (declare (ignore weak-ref))
;;   `(let ((string ,string))
;;      ;; Always copy strings to prevent seg fault due to GC
;;      (funcall
;;       ',(proxy-class-copy (find-class type-spec))
;;       ',type-spec
;;       (make-pointer (1+ (kernel:get-lisp-obj-address string))))))

;; (deftype-method cleanup-alien gstring (type-spec c-string &optional weak-ref)
;;   (when weak-ref
;;     (unreference-alien type-spec c-string)))



;;;; NULL terminated vector of strings

(deftype strings () '(null-terminated-vector string))
(register-type 'strings '|g_strv_get_type|)