Method member as argument in SIP

I have a C++ class defined with a method which has a member method as argument:

MyClass : public QDialog, private Ui::MyClassBase
{
  Q_OBJECT
  public:
    MyClass( QWidget *parent = nullptr );

    void connectValueChanged( QWidget* widget, void ( MyClass::*slot )() );
}

and

 void MyClass::connectValueChanged( QWidget* widget, void ( MyClass::*slot )() )
 {
   connect( w, &QWidget::signal, this, slot );
 }

The connectValueChanged cannot be used as defined in the SIP file, I get a syntax error. What shall I do to define a method with a member method as argument in SIP?