#include "Wt/WContainerWidget"
#include "Wt/WPushButton"
#include "Wt/WSignal"

 class MyWidget : public Wt::WContainerWidget
 {
 public:
   MyWidget(Wt::WContainerWidget *parent = 0)
     : Wt::WContainerWidget(parent),
       done_(this)
   {
      Wt::WPushButton *button = new Wt::WPushButton("Okay");
      button->clicked().connect(SLOT(this, MyWidget::process));
   }

   // provide an accessor for the signal
   Wt::Signal<int, std::string>& done() { return done_; }

 private:
   Wt::Signal<int, std::string> done_;

   void process() {
     done_.emit(42, "Totally done"); // emit the signal
   }
 };
 class GUIClass : public Wt::WContainerWidget
 {

 private:
   void init() {
     MyWidget *widget = new MyWidget(this);
     widget->done().connect(SLOT(this, GUIClass::whenDone));
   }

   void whenDone(int result, const std::string& description) {
   }
 };