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/*
Copyright (C) 2016-2021 Carl Hetherington <cth@carlh.net>
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.
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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DCPOMATIC_CONTENT_PART_H
#define DCPOMATIC_CONTENT_PART_H
#include "change_signaller.h"
#include "content.h"
#include <boost/thread/mutex.hpp>
class Content;
class Film;
class ContentPart
{
public:
explicit ContentPart (Content* parent)
: _parent (parent)
{}
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;
mutable boost::mutex _mutex;
};
#endif
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