1. A complete instance of movetothread, 2. QT expression evaluation

1.moveToThread A complete instance of

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    Timer *timer = new Timer;
    timer->setInterval(1000);
    THread *t = new THread(this);
    timer->moveToThread(t);
    connect(t, SIGNAL(started()), timer, SLOT(start()));
    connect(t, SIGNAL(finished()), timer, SLOT(deleteLater()));
    connect(timer, SIGNAL(timeout()), this ,SLOT(print()));
    //
    t->start();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::print()
{
    qDebug()<<"timeout";
}

// Self defined Timer
Timer::~Timer()
{
    qDebug()<< __FUNCTION__;
}

//THread
THread::~THread()
{
    this->quit();
    this->wait();
    qDebug()<< __FUNCTION__;
}

2.qt Expression evaluation

QScriptEngine().evaluate("3 + Math.sqrt(5) + Math.pow(3,2) + Math.log(5)").toNumber()