c++11 call constructor from constructor

I'm trying to call constructor with C++11 format, but couldn't get it from other post of same name:

c++ call constructor from constructor

CubeWidget::CubeWidget(QWidget *parent) :
    QOpenGLWidget(parent),
    geometries(0),
    texture(0),
    angularSpeed(0),
    receivedStopCommand(false)
{
    sound = new ParameterizedSoundTest;
}

explicit CubeWidget::CubeWidget(parent) : CubeWidget::CubeWidget(int x, int y, int w, int h, QWidget *parent = 0)
{

    setGeometry(QRect(x,y,w,h));
    show();
}