QWidget crash on creation

[sandro4912]

I have this code based on a book with QT4. It crashes on QT5 on the creation of QWidget:

#include <QApplication>

#include <QVBoxLayout>
#include <QSlider>

int main(int argc, char** argv)
{
    QApplication(argc, argv);

    QWidget base;
    QVBoxLayout layout( &base );

    QSlider slider( Qt::Horizontal );

    layout.addWidget( &slider );

    base.show();

    return QApplication::exec();
}

On crash it shows this:

1 initFontUnlocked qguiapplication.cpp 250 0x7fecd326f61
2 QGuiApplication::font qguiapplication.cpp 3260 0x7fecd31ddbd
3 QFont::QFont qfont.cpp 611 0x7fecd46d185
4 QWidgetData::QWidgetData Qt5Widgetsd 0x7fece16adb6
5 QWidgetPrivate::QWidgetPrivate qwidget.cpp 262 0x7fece14fe1d
6 QWidget::QWidget qwidget.cpp 1028 0x7fece13f879
7 main main.cpp 11 0x13f113358
8 WinMain qtmain_win.cpp 97 0x13f117dd5
9 invoke_main exe_common.inl 107 0x13f1158dd
10 __scrt_common_main_seh exe_common.inl 288 0x13f11578e
11 __scrt_common_main exe_common.inl 331 0x13f11564e
12 WinMainCRTStartup exe_winmain.cpp 17 0x13f115969
13 BaseThreadInitThunk kernel32 0x772b556d
14 RtlUserThreadStart ntdll 0x7741385d

Is it not allowed to use QWdiget like this anymore?

[sandro4912]

ok this was stupid it must be

QApplication app(argc, argv);

in the first line not

QApplication(argc, argv);

[sandro4912]

ok this was stupid it must be

QApplication app(argc, argv);

in the first line not

QApplication(argc, argv);