#ifndef SINGLETON_H
#define SINGLETON_H

#include <QMutex>

template <class O>
class Singleton {
    O* inst;
    mutable QMutex mutex;

public:
    Singleton() {
    }

    static O* instance() {
        if (inst == NULL) {
            QMutexLocker locker(mutex);

            inst = new O();
        }

        return inst;
    }
};

#endif // SINGLETON_H