+bool
+Beam::is_cross_staff (Grob *me)
+{
+ extract_grob_set (me, "stems", stems);
+ Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (me);
+ for (vsize i = 0; i < stems.size (); i++)
+ if (Staff_symbol_referencer::get_staff_symbol (stems[i]) != staff_symbol)
+ return true;
+ return false;
+}
+
+MAKE_SCHEME_CALLBACK (Beam, cross_staff, 1)
+SCM
+Beam::cross_staff (SCM smob)
+{
+ return scm_from_bool (is_cross_staff (unsmob_grob (smob)));
+}
+