Modified DEFCALLBACK to avoid unnecessary variable bindings.

diff --git a/glib/ffi.lisp b/glib/ffi.lisp
index aa95293c21073f0df01502b960a2af901e611d43..385a7c4f121e2949f1ef0fe7aeab0090334b1b87 100644 (file)
--- a/glib/ffi.lisp
+++ b/glib/ffi.lisp
@@ -15,7 +15,7 @@
 ;; License along with this library; if not, write to the Free Software
 ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
-;; $Id: ffi.lisp,v 1.17 2005-02-25 23:55:06 espen Exp $
+;; $Id: ffi.lisp,v 1.18 2005-03-13 18:06:51 espen Exp $
 
 (in-package "GLIB")
 
@@ -207,10 +207,14 @@ (defmacro defcallback (name (return-type &rest args) &body body)
                          `(,name ,(alien-type type))))
                    args))
        ,(to-alien-form 
-        `(let (,@(mapcar #'(lambda (arg)
-                             (destructuring-bind (name type) arg
-                               `(,name ,(from-alien-form name type))))
-                         args))
+        `(let (,@(delete nil
+                    (mapcar #'(lambda (arg)
+                                (destructuring-bind (name type) arg
+                                  (let ((from-alien 
+                                         (from-alien-form name type)))
+                                    (unless (eq name from-alien)
+                                      `(,name ,from-alien)))))
+                     args)))
            ,@body)
         return-type))))
 
@@ -218,6 +222,8 @@ (defmacro defcallback (name (return-type &rest args) &body body)
 (defun callback (af)
   (sb-alien:alien-function-sap af))
 
+#+sbcl
+(deftype callback () 'sb-alien:alien-function)
 
 ;;;; Definitons and translations of fundamental types