- static bool has_interface (Grob *);
- DECLARE_SCHEME_CALLBACK (print, (SCM ));
- DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM));
+ DECLARE_GROB_INTERFACE();
+ DECLARE_SCHEME_CALLBACK (print, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_positioning_done, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_cross_staff, (SCM));