Hello List, I would like to have a templated parse function within each of my states. Unfortunatly I am unable to successfully create a version that compiles, perhaps if someone could show how to get it to work. Here is the code: namespace xml { class prolog; template<typename T> class Entity { public: virtual boost::regex regex() const = 0; virtual void parse(T,T) = 0; }; class document : public boost::statechart::state_machine< document, prolog > { public: virtual ~document( ) {}; private: friend class prolog; static boost::regex character, white_space, name_start_character, name_character, name, names, nmtoken, nmtokens, comment, process_instruction_target, process_instruction, CDATA, equal, version_info, encoding_name, encoding_declaration, standalone_document_declaration, xml_declaration, prolog; protected: document( ) { initiate(); }; template<typename T> boost::regex regex( ) const { return state_cast<const Entity<T>&>().regex(); }; template<typename T> void parse( T begin, T end ) { return state_cast<const Entity<T>&>().parse(begin,end); } }; class prolog : public Entity ///<-----needs argument here but compains the 'prolog' is NOT a template , public boost::statechart::simple_state< prolog, document > { public: prolog( ) {}; ~prolog( ) {}; virtual boost::regex regex( ) const { return document::prolog;//FIXME...match element aswell }; virtual void parse( T begin, T end ) { }; private: protected: }; }; Any help on this will be appreciated. Thank you all. Etienne