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[Linker error] undefined reference to `vtable for Hauptfenster'

Code: Alles auswählen

#include <QApplication>
#include <QObject>
#include <QWidget>
#include <QGridLayout>
#include <QLabel>
#include <QPushButton>


class Hauptfenster : public QWidget
{
  Q_OBJECT
  public:
  Hauptfenster ()
  {
     box = new QGridLayout (this);
     button[0] = new QPushButton ("Drücken1",this);
     button[1] = new QPushButton ("Drücken2",this);
     label[0] = new QLabel("Was ist das ?",this);
     label[1] = new QLabel("Was ist das ?",this);
     
     box->addWidget(button[0],0,0) ;
     box->addWidget(label[0],0,1) ;
     box->addWidget(button[1],1,0) ;
     box->addWidget(label[1],1,1) ;
     
     
     QObject::connect( button[0], SIGNAL(clicked()), this,
              SLOT(setlabel ()));
     QObject::connect( button[1], SIGNAL(clicked()), this,
              SLOT(setlabel())) ;
     this->show();
  }
  private slots:
     void setlabel ()
     {
        label[0]->setText("Label1");
        label[1]->setText("Label2");
     }    
  private:
  QGridLayout * box;
  QLabel * label[2];
  QPushButton * button[2];
};