#include <QtWidgets>

class Widget : public QWidget
{
public:
    Widget(QWidget *parent = 0)
    {
        qDebug("Start.");
    }

    ~Widget()
    {
        qDebug("End.");
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}