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/*
* dxr3singleton.h
*
* Copyright (C) 2004-2009 Christian Gmeiner
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef _DXR3_SINGLETON_H_
#define _DXR3_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 /*_DXR3_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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