X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Finclude%2Fperformer.hh;h=82b4ce50cc2b66bf04e228ebc74aacd476ce64f4;hb=47db9a3883d726ca53e2133a3b2298f78dd6a32e;hp=a94165a6bd825236b356419a07f5fc36fc6f69f3;hpb=38d7d319eabc906e82fb42002678c6d42a23b6f7;p=lilypond.git

diff --git a/lily/include/performer.hh b/lily/include/performer.hh
index a94165a6bd..82b4ce50cc 100644
--- a/lily/include/performer.hh
+++ b/lily/include/performer.hh
@@ -1,8 +1,21 @@
 /*
-  performer.hh -- declare Performer
+  This file is part of LilyPond, the GNU music typesetter.
 
-  (c) 1996--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1996--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
   Jan Nieuwenhuizen <janneke@gnu.org>
+
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef PERFORMER_HH
@@ -12,7 +25,7 @@
 #include "grob-info.hh"
 #include "translator.hh"
 
-/* Convert a music definition into a audio representation.
+/* Convert a music definition into an audio representation.
    A baseclass.  */
 class Performer : public Translator
 {
@@ -20,6 +33,12 @@ public:
   VIRTUAL_COPY_CONSTRUCTOR (Translator, Performer);
   friend class Performer_group;
   Performer_group *get_daddy_performer () const;
+  static Performer *unsmob (SCM perf) {
+    return dynamic_cast <Performer *> (Translator::unsmob (perf));
+  }
+  static bool is_smob (SCM perf) {
+    return Translator::is_smob (perf) && unsmob (perf);
+  }
 
 protected:
   virtual void announce_element (Audio_element_info);