/*QT对C++的拓展*/

    //std::bind std::function

    QObject::connect(&button, SIGNAL(clicked()), &w, SLOT(close()));

    w.setWindowTitle("Hello World");

    /*在exec中有一个消息循环*/

    return app.exec();

    /* QT对C++的拓展 */

    //std::bind std::function

    QObject::connect(&button,SIGNAL(clicked()),&w,SLOT(close()));

    w.setWindowTitle("Hello World");

    /*在exec中有一个消息循环*/

    return app.exec();