- return sign (Staff_symbol_referencer::get_position ((Grob*)a)
- - Staff_symbol_referencer::get_position ((Grob*) b));
+ return sign (Staff_symbol_referencer::get_position ((Grob *)a)
+ - Staff_symbol_referencer::get_position ((Grob *) b));
+}
+
+bool
+position_less (Grob *const &a, Grob *const &b)
+{
+ return Staff_symbol_referencer::get_position (a)
+ < Staff_symbol_referencer::get_position (b);