typo

[lilypond.git] / lily / staff-symbol-referencer.cc

diff --git a/lily/staff-symbol-referencer.cc b/lily/staff-symbol-referencer.cc
index 87e83fadad1523842f0cddf291c30c0715f6726c..7fe0bf3131679d75ad7aa456547719430f103c1d 100644 (file)
--- a/lily/staff-symbol-referencer.cc
+++ b/lily/staff-symbol-referencer.cc
@@ -8,8 +8,8 @@
 
 #include "staff-symbol-referencer.hh"
 
-
 #include "staff-symbol.hh"
+#include "grob.hh"
 #include "output-def.hh"
 #include "libc-extension.hh"
 
@@ -156,7 +156,14 @@ compare_position (Grob *const &a, Grob *const &b)
               - Staff_symbol_referencer::get_position ((Grob *) b));
 }
 
-ADD_INTERFACE (Staff_symbol_referencer, "staff-symbol-referencer-interface",
+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 position is meant relative to a staff "
               "symbol. "
               "These usually have @code{Staff_symbol_referencer::callback} "