- static bool has_interface (Grob*);
- DECLARE_SCHEME_CALLBACK (force_shift_callback, (SCM ,SCM));
- DECLARE_SCHEME_CALLBACK (side_position, (SCM ,SCM));
- static SCM do_shifts (Grob*);
+ DECLARE_GROB_INTERFACE();
+ DECLARE_SCHEME_CALLBACK (side_position, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_positioning_done, (SCM));