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/* -*- 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>
// type trait helper
template <typename T, typename... Types>
struct pack_contains;
template <typename T, typename... Types>
struct pack_contains<T, T, Types...>
: std::true_type {
};
template <typename T, typename Head, typename... Types>
struct pack_contains<T, Head, Types...>
: pack_contains<T, Types...> {
};
template <typename T>
struct pack_contains<T>
: std::false_type {
};
// --------------------------------------------------------------------
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(T const & data)
: mutex{}
, data{data} {
}
Group(T&& data)
: mutex{}
, data{std::move(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);
}
operator T() const {
std::lock_guard<std::mutex> lock{mutex};
return data;
}
};
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