+ DECLARE_SCHEME_CALLBACK (y_aligned_on_support_refpoints, (SCM element));
+ DECLARE_SCHEME_CALLBACK (pure_y_aligned_on_support_refpoints, (SCM element, SCM start, SCM end));
+ DECLARE_SCHEME_CALLBACK (x_aligned_side, (SCM element, SCM current));
+ DECLARE_SCHEME_CALLBACK (y_aligned_side, (SCM element, SCM current));
+ DECLARE_SCHEME_CALLBACK (pure_y_aligned_side, (SCM element, SCM start, SCM end, SCM current));
+ DECLARE_SCHEME_CALLBACK (calc_cross_staff, (SCM element));
+ DECLARE_SCHEME_CALLBACK (move_to_extremal_staff, (SCM));
+
+ static SCM aligned_side (Grob *me, Axis a, bool pure, int start, int end, Real *current_off_ptr);
+
+ static Axis get_axis (Grob *);
+ static void set_axis (Grob *, Axis);
+ DECLARE_GROB_INTERFACE ();
+ static void add_support (Grob *, Grob *);
+ static void recursive_add_support (Grob *, Grob *);
+ static void add_staff_support (Grob *);
+};