/*
- 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