1 files changed, 106 insertions, 0 deletions
diff --git a/src/syncedsettings.h b/src/syncedsettings.h
new file mode 100644
index 0000000..0fe5efd
--- /dev/null
+++ b/src/syncedsettings.h
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            syncedsettings.h
+ *
+ *  Thu Mar 31 09:23:27 CEST 2016
+ *  Copyright 2016 Christian Glöckner
+ *  cgloeckner@freenet.de
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <mutex>
+
+template <typename T> class Group;
+
+template <typename T> class Accessor
+{
+private:
+	std::lock_guard<std::mutex> lock;
+
+public:
+	Accessor(Group<T>& parent)
+		: lock{parent.mutex}
+		, data(parent.data)
+	{
+	}
+
+	T& data;
+};
+
+template <typename T> class Group
+{
+private:
+	friend class Accessor<T>;
+
+	mutable std::mutex mutex;
+	T data;
+
+public:
+	Group()
+		: mutex{}
+		, data{}
+	{
+	}
+
+	Group(Group<T> const& other)
+		: mutex{}
+		, data{}
+	{
+		std::lock_guard<std::mutex> lock{other.mutex};
+		data = other.data;
+	}
+
+	Group(Group<T>&& other)
+		: mutex{}
+		, data{}
+	{
+		std::lock_guard<std::mutex> lock{other.mutex};
+		std::swap(data, other.data);
+	}
+
+	Group<T>& operator=(const Group<T>& other)
+	{
+		if (*this != &other)
+		{
+			std::lock_guard<std::mutex> lock{mutex};
+			std::lock_guard<std::mutex> lock2{other.mutex};
+			data = other.data;
+		}
+		return *this;
+	}
+	
+	Group<T>& operator=(Group<T>&& other)
+	{
+		if (*this != &other)
+		{
+			std::lock_guard<std::mutex> lock{mutex};
+			std::lock_guard<std::mutex> lock2{other.mutex};
+			std::swap(data, other.data);
+		}
+		return *this;
+	}
+
+	operator T() const
+	{
+		std::lock_guard<std::mutex> lock{mutex};
+		return data;
+	}
+};