2 Copyright (C) 2016-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 #ifndef DCPOMATIC_CONTENT_PART_H
23 #define DCPOMATIC_CONTENT_PART_H
26 #include "change_signaller.h"
28 #include <boost/thread/mutex.hpp>
38 explicit ContentPart (Content* parent)
45 maybe_set (T& member, T new_value, int property) const
47 ContentChangeSignaller cc (_parent, property);
49 boost::mutex::scoped_lock lm (_mutex);
50 if (member == new_value) {
60 maybe_set (boost::optional<T>& member, T new_value, int property) const
62 ContentChangeSignaller cc (_parent, property);
64 boost::mutex::scoped_lock lm (_mutex);
65 if (member && member.get() == new_value) {
74 mutable boost::mutex _mutex;