Added ParentList's into StateSet, Uniform and StateAttribute in preparation for

providing update and event handling.

src/osg/StateAttribute.cpp

@@ -0,0 +1,27 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield 
+ *
+ * This application is open source and may be redistributed and/or modified   
+ * freely and without restriction, both in commericial and non commericial
+ * applications, as long as this copyright notice is maintained.
+ * 
+ * This application is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+*/
+
+#include <osg/StateAttribute>
+
+#include <algorithm>
+
+using namespace osg;
+
+void StateAttribute::addParent(osg::StateSet* object)
+{
+    _parents.push_back(object);
+}
+
+void StateAttribute::removeParent(osg::StateSet* object)
+{
+    ParentList::iterator pitr = std::find(_parents.begin(),_parents.end(),object);
+    if (pitr!=_parents.end()) _parents.erase(pitr);
+}