+
+ return SCM_UNSPECIFIED;
+}
+
+/*
+ Return I such that SP == SP->ORIGINAL ()->BROKEN_INTOS_[I].
+*/
+int
+broken_spanner_index (Spanner const *sp)
+{
+ Spanner *parent = dynamic_cast<Spanner *> (sp->original ());
+ /* ugh: casting */
+ return find (parent->broken_intos_, (Spanner*) sp) - parent->broken_intos_.begin ();
+}
+
+Spanner *
+unsmob_spanner (SCM s)
+{
+ return dynamic_cast<Spanner *> (unsmob_grob (s));
+}
+
+MAKE_SCHEME_CALLBACK (Spanner, bounds_width, 1);
+SCM
+Spanner::bounds_width (SCM grob)
+{
+ Spanner *me = unsmob_spanner (grob);
+
+
+ Grob *common = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT), X_AXIS);
+
+ Interval w (me->get_bound (LEFT)->relative_coordinate (common, X_AXIS),
+ me->get_bound (RIGHT)->relative_coordinate (common, X_AXIS));
+
+ w -= me->relative_coordinate (common, X_AXIS);
+
+ return ly_interval2scm (w);