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/*
* _ _ _ _ _____
* __ ____| |_ __ _ __ | |_ _ __ _(_)_ __ __| |_ ___ _|___ /
* \ \ / / _` | '__|____| '_ \| | | | |/ _` | | '_ \ _____ / _` \ \/ / '__||_ \
* \ V / (_| | | |_____| |_) | | |_| | (_| | | | | |_____| (_| |> <| | ___) |
* \_/ \__,_|_| | .__/|_|\__,_|\__, |_|_| |_| \__,_/_/\_\_| |____/
* |_| |___/
*
* Copyright (C) 2004-2009 Christian Gmeiner
*
* This file is part of vdr-plugin-dxr3.
*
* vdr-plugin-dxr3 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 version 2.
*
* vdr-plugin-dxr3 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 dxr3-plugin. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef _SINGLETON_H_
#define _SINGLETON_H_
#include <memory>
#include <vdr/thread.h>
template <class T>
class Singleton {
public:
static T *instance() {
// use double-checked looking
// see http://en.wikipedia.org/wiki/Double-checked_locking
if (inst.get() == 0) {
m.Lock();
if (inst.get() == 0) {
inst = std::auto_ptr<T>(new T);
}
m.Unlock();
}
return inst.get();
}
virtual ~Singleton() { }
protected:
Singleton() { }
private:
static std::auto_ptr<T> inst;
static cMutex m;
};
template<class T>
std::auto_ptr<T> Singleton<T>::inst(0);
template<class T>
cMutex Singleton<T>::m;
#endif /*_SINGLETON_H_*/
// Local variables:
// mode: c++
// c-file-style: "stroustrup"
// c-file-offsets: ((inline-open . 0))
// tab-width: 4;
// indent-tabs-mode: nil
// End:
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