Fix the build for older macOS.

[dcpomatic.git] / src / lib / content_part.h

diff --git a/src/lib/content_part.h b/src/lib/content_part.h
index 9ee26cbdb1d47378ac3502202aa473ffbfe5cd7b..590be311289406c738b153423d5a6ab206a8d9e2 100644 (file)
--- a/src/lib/content_part.h
+++ b/src/lib/content_part.h
@@ -1,43 +1,78 @@
 /*
-    Copyright (C) 2016 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2016-2021 Carl Hetherington <cth@carlh.net>
 
-    This program is free software; you can redistribute it and/or modify
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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 2 of the License, or
     (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
+    DCP-o-matic 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 this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
+
 #ifndef DCPOMATIC_CONTENT_PART_H
 #define DCPOMATIC_CONTENT_PART_H
 
-#include <boost/weak_ptr.hpp>
+
+#include "change_signaller.h"
+#include "content.h"
 #include <boost/thread/mutex.hpp>
 
+
 class Content;
 class Film;
 
+
 class ContentPart
 {
 public:
-       ContentPart (Content* parent, boost::shared_ptr<const Film> film)
+       explicit ContentPart (Content* parent)
                : _parent (parent)
-               , _film (film)
        {}
 
 protected:
+       template <class T>
+       void
+       maybe_set (T& member, T new_value, int property) const
+       {
+               ContentChangeSignaller cc (_parent, property);
+               {
+                       boost::mutex::scoped_lock lm (_mutex);
+                       if (member == new_value) {
+                               cc.abort ();
+                               return;
+                       }
+                       member = new_value;
+               }
+       }
+
+       template <class T>
+       void
+       maybe_set (boost::optional<T>& member, T new_value, int property) const
+       {
+               ContentChangeSignaller cc (_parent, property);
+               {
+                       boost::mutex::scoped_lock lm (_mutex);
+                       if (member && member.get() == new_value) {
+                               cc.abort ();
+                               return;
+                       }
+                       member = new_value;
+               }
+       }
+
        Content* _parent;
-       boost::weak_ptr<const Film> _film;
        mutable boost::mutex _mutex;
 };
 
+
 #endif