Move Shared class to a separate file

src/utility/shared_resource.h

@@ -0,0 +1,60 @@
+/***************************************************************************
+ *   Copyright (C) 2008-2016 by Andrzej Rybczak                            *
+ *   electricityispower@gmail.com                                          *
+ *                                                                         *
+ *   This program 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,       *
+ *   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.,                                       *
+ *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
+ ***************************************************************************/
+
+#ifndef NCMPCPP_UTILITY_SHARED_RESOURCE_H
+#define NCMPCPP_UTILITY_SHARED_RESOURCE_H
+
+#include <mutex>
+
+template <typename ResourceT>
+struct Shared
+{
+	struct Resource
+	{
+		Resource(std::mutex &mutex, ResourceT &resource)
+			: m_lock(std::unique_lock<std::mutex>(mutex)), m_resource(resource)
+		{ }
+
+		ResourceT &operator*() { return m_resource; }
+		const ResourceT &operator*() const { return m_resource; }
+
+		ResourceT *operator->() { return &m_resource; }
+		const ResourceT *operator->() const { return &m_resource; }
+
+	private:
+		std::unique_lock<std::mutex> m_lock;
+		ResourceT &m_resource;
+	};
+
+	Shared(){ }
+
+	template <typename ValueT>
+	Shared(ValueT &&value)
+		: m_resource(std::forward<ValueT>(value))
+	{ }
+
+	Resource acquire() { return Resource(m_mutex, m_resource); }
+
+private:
+	std::mutex m_mutex;
+	ResourceT m_resource;
+};
+
+#endif // NCMPCPP_UTILITY_SHARED_RESOURCE_H