X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Finclude%2Fspanner.hh;h=788b0e46ee46e1ef4889862b58d8c1bd4ed5a04e;hb=47db9a3883d726ca53e2133a3b2298f78dd6a32e;hp=b56cc2264de02372fa8ae4f41fc7881bd73f8a75;hpb=e8b68d8a878a0ee0381719230cf911dbcefa168d;p=lilypond.git

diff --git a/lily/include/spanner.hh b/lily/include/spanner.hh
index b56cc2264d..788b0e46ee 100644
--- a/lily/include/spanner.hh
+++ b/lily/include/spanner.hh
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1996--2014 Han-Wen Nienhuys
+  Copyright (C) 1996--2015 Han-Wen Nienhuys
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -52,7 +52,12 @@ public:
   DECLARE_SCHEME_CALLBACK (bounds_width, (SCM));
   DECLARE_SCHEME_CALLBACK (kill_zero_spanned_time, (SCM));
 
-  static Spanner *unsmob (SCM);
+  static Spanner *unsmob (SCM s) {
+    return dynamic_cast <Spanner *> (Grob::unsmob (s));
+  }
+  static bool is_smob (SCM s) {
+    return Grob::is_smob (s) && unsmob (s);
+  }
 
   vector<Spanner *> broken_intos_;