(protect_smob): experiment: O(1) GC (un)protection.

[lilypond.git] / lily / ledger-line-engraver.cc

diff --git a/lily/ledger-line-engraver.cc b/lily/ledger-line-engraver.cc
index 11c496b299f82bb2f58a941341873b19da8ee4ce..4ab91ece0fa7a5fd7172147c37bc68d1a19eae8f 100644 (file)
--- a/lily/ledger-line-engraver.cc
+++ b/lily/ledger-line-engraver.cc
@@ -20,8 +20,10 @@ public:
 
 protected:
   virtual void finalize ();
-  virtual void process_music ();
-  virtual void acknowledge_grob (Grob_info);
+  PRECOMPUTED_VIRTUAL void process_music ();
+ 
+  DECLARE_ACKNOWLEDGER(ledgered);
+  DECLARE_ACKNOWLEDGER(staff_symbol);
 
   void start_spanner ();
   void stop_spanner ();
@@ -65,20 +67,22 @@ Ledger_line_engraver::stop_spanner ()
 }
 
 void
-Ledger_line_engraver::acknowledge_grob (Grob_info s)
+Ledger_line_engraver::acknowledge_staff_symbol (Grob_info s)
 {
-  if (Staff_symbol::has_interface (s.grob ()))
+  Spanner *sym = dynamic_cast<Spanner*> (s.grob ());
+
+  if (!span_
+      || span_->get_bound (LEFT) != sym->get_bound (LEFT))
     {
-      Spanner *sym = dynamic_cast<Spanner*> (s.grob ());
-
-      if (!span_
-         || span_->get_bound (LEFT) != sym->get_bound (LEFT))
-       {
-         stop_spanner ();
-         start_spanner ();
-       }
+      stop_spanner ();
+      start_spanner ();
     }
-  else if (span_)
+}
+
+void
+Ledger_line_engraver::acknowledge_ledgered (Grob_info s)
+{
+  if (span_)
     {
       if (!to_boolean (s.grob ()->get_property ("no-ledgers")))
        Pointer_group_interface::add_grob (span_, ly_symbol2scm ("note-heads"),
@@ -86,10 +90,13 @@ Ledger_line_engraver::acknowledge_grob (Grob_info s)
     }
 }
 
+#include "translator.icc"
+
+ADD_ACKNOWLEDGER(Ledger_line_engraver,ledgered);
+ADD_ACKNOWLEDGER(Ledger_line_engraver,staff_symbol);
 ADD_TRANSLATOR (Ledger_line_engraver,
                "Creates the spanner to draw ledger lines, and notices objects that need ledger lines",
                /* creats*/ "LedgerLineSpanner",
                /* accepts */ "",
-               /* acks  */ "staff-symbol-interface ledgered-interface", // ledgered-interface? 
                /* reads */ "",
                /* write */ "")