class myClass : public QObject{
Q_OBJECT
private:
　QThread* th;
public:
　myClass();
　virtual ~myClass(){}
pulic slots:
　void fin();
signals:
　void thread_quit();
};

myClass():th(new QThead()){
　connect(
　 　this,
　 　&myClass::thread_quit,
　 　th,
　 　[&]{ th->quit(); th->wait(); delete th; }
　);
　moveToThread(th);

　// other initializations

　th->start();
}

void myClass::fin(){
　moveToThread(th->thread());
　emit thread_quit();
}