diff --git a/include/boo/graphicsdev/IGraphicsDataFactory.hpp b/include/boo/graphicsdev/IGraphicsDataFactory.hpp
index f944816..2e4cd4e 100644
--- a/include/boo/graphicsdev/IGraphicsDataFactory.hpp
+++ b/include/boo/graphicsdev/IGraphicsDataFactory.hpp
@@ -292,6 +292,7 @@ public:
         return *this;
     }
     ~GraphicsDataToken() {doDestroy();}
+    operator bool() const {return m_factory && m_data;}
 };
 
 }