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singleton.h

#include 
   
    #include 
    
     #include 
     
      class Singleton:public QObject{public:    static Singleton* instance()    {        static QMutex mutex;        if (!m_instance) {            QMutexLocker locker(&mutex);            if (!m_instance)                m_instance = new Singleton;        }         return m_instance;    }private:    Singleton();    static Singleton* m_instance;};
     
    
   

singleton.cpp

#include 
   
    #include "singleton.h"Singleton *Singleton::m_instance = 0;Singleton::Singleton():    QObject(qApp){}
   

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