+ExtensionItem* ExtensionManager::GetItem(const std::string& name)
+{
+ ExtMap::iterator i = types.find(name);
+ if (i == types.end())
+ return NULL;
+ return i->second;
+}
+
+void Extensible::doUnhookExtensions(const std::vector<reference<ExtensionItem> >& toRemove)
+{
+ for(std::vector<reference<ExtensionItem> >::const_iterator i = toRemove.begin(); i != toRemove.end(); ++i)
+ {
+ ExtensionItem* item = *i;
+ ExtensibleStore::iterator e = extensions.find(item);
+ if (e != extensions.end())
+ {
+ item->free(this, e->second);
+ extensions.erase(e);
+ }
+ }
+}
+
+Extensible::Extensible()
+ : culled(false)
+{
+}
+
+CullResult Extensible::cull()
+{
+ FreeAllExtItems();
+ culled = true;
+ return classbase::cull();
+}
+
+void Extensible::FreeAllExtItems()