Issue 4541 (1/2) Introduce a Grob_interface class

[lilypond.git] / lily / note-column.cc

diff --git a/lily/note-column.cc b/lily/note-column.cc
index f5b6f35e9045189b6ba5f88118cefc522b7100cf..a5da30a8c7926214df6982f11f75ac639338f009 100644 (file)
--- a/lily/note-column.cc
+++ b/lily/note-column.cc
@@ -107,7 +107,7 @@ Note_column::dir (Grob *me)
         return (Direction)sign (head_positions_interval (me).center ());
     }
 
-  if (has_interface (me))
+  if (Note_column::has_interface (me))
     programming_error ("Note_column without heads and stem");
   else
     programming_error ("dir() given grob without Note_column interface");