diff --git a/include/utils/RefBase.h b/include/utils/RefBase.h
index 4126225..f8c3216 100644
--- a/include/utils/RefBase.h
+++ b/include/utils/RefBase.h
@@ -116,17 +116,23 @@
 
     typedef RefBase basetype;
 
+    // used to override the RefBase destruction.
+    class Destroyer {
+        friend class RefBase;
+    public:
+        virtual ~Destroyer();
+    private:
+        virtual void destroy(RefBase const* base) = 0;
+    };
+
+    // Make sure to never acquire a strong reference from this function. The
+    // same restrictions than for destructors apply.
+    void setDestroyer(Destroyer* destroyer);
+
 protected:
                             RefBase();
     virtual                 ~RefBase();
 
-    // called when the last reference goes away. this is responsible for
-    // calling the destructor. The default implementation just does
-    // "delete this;".
-    // Make sure to never acquire a strong reference from this function. The
-    // same restrictions than for destructors apply.
-    virtual void            destroy() const;
-
     //! Flags for extendObjectLifetime()
     enum {
         OBJECT_LIFETIME_WEAK    = 0x0001,