-ADD_INTERFACE (Staff_symbol_referencer,"staff-symbol-referencer-interface",
- "Object whose Y position is meant relative to a staff "
- "symbol. These objects usually have "
- "Staff_symbol_referencer::callback in their Y-offset-callback. "
- ,
- "staff-position");
+bool
+position_less (Grob *const &a, Grob *const &b)
+{
+ return Staff_symbol_referencer::get_position (a)
+ < Staff_symbol_referencer::get_position (b);
+}
+
+ADD_INTERFACE (Staff_symbol_referencer,
+ "An object whose Y@tie{}position is meant relative to a staff"
+ " symbol. These usually"
+ " have @code{Staff_symbol_referencer::callback} in their"
+ " @code{Y-offset-callbacks}.",
+
+ /* properties */
+ "staff-position "
+ );