Issue 4899/2: Revert "Issue 4885/3: Remove ack_finder/ack_find_base"

[lilypond.git] / lily / include / engraver.hh

diff --git a/lily/include/engraver.hh b/lily/include/engraver.hh
index 928f6a969dbddad717c25856351b53b9fba4f5d5..d0f6e8979ced98b1688462f03409d6936be10185 100644 (file)
--- a/lily/include/engraver.hh
+++ b/lily/include/engraver.hh
@@ -58,6 +58,9 @@ public:
     (t->*callback) (Grob_info (e, g));
     return SCM_UNSPECIFIED;
   }
+  template <class T, void (T::*callback)(Grob_info)>
+  static SCM ack_find_base ()
+  { return Callback2_wrapper::make_smob<ack_trampoline<T, callback> > (); }
 
   /**
      Announce element. Default: pass on to daddy. Utility