X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstencil-expression.cc;h=0ada96783103553ac882bc35e467ef48d4ecc382;hb=50163d8198f9cdb0308a4643a6afa1d6ed053ce1;hp=06fe314fd0e5e043fe9cc604149e3711257e172c;hpb=260073be07f49a5f6f3be8df2af52873843eec60;p=lilypond.git

diff --git a/lily/stencil-expression.cc b/lily/stencil-expression.cc
index 06fe314fd0..0ada967831 100644
--- a/lily/stencil-expression.cc
+++ b/lily/stencil-expression.cc
@@ -1,25 +1,35 @@
 /*
-  stencil-expression.cc -- keep track of which expressions are valid
-  stencil exps.
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  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/>.
 */
 
 #include "stencil.hh"
 
-#include "protected-scm.hh"
-
-static Protected_scm heads = SCM_EOL;
+static SCM heads;
 
 void register_stencil_head (SCM symbol)
 {
-  scm_set_object_property_x (symbol, ly_symbol2scm ("stencil-head?"), SCM_BOOL_T);
-  heads = scm_cons (symbol, heads);
+  if (!heads)
+    heads = scm_permanent_object (scm_cons (SCM_EOL, SCM_EOL));
   
+  scm_set_object_property_x (symbol, ly_symbol2scm ("stencil-head?"), SCM_BOOL_T);
+  scm_set_cdr_x (heads,  scm_cons (symbol, scm_cdr (heads)));
 }
+
 bool
 is_stencil_head (SCM symbol)
 {
@@ -30,6 +40,6 @@ is_stencil_head (SCM symbol)
 SCM
 all_stencil_heads ()
 {
-  return heads;
+  return scm_cdr (heads);
 }
-  
+