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#include<QApplication>
#include<QWidget>
#include<QVBoxLayout>
#include<QCheckBox>

class BoxHandler;

class Box:public QCheckBox
{
	Q_OBJECT

   public:
		Box(BoxHandler** Handler,const QString & text,int num)
			:QCheckBox(text,0),num(num),Handler(Handler)
		{
          connect(this,SIGNAL(stateChanged(int)),this,SLOT(sendToHandler(int)));
      }
   
	public slots:
      void sendToHandler(int i);
      

	private:
      int num;
      BoxHandler**Handler;
};

class BoxHandler
{
   public:
      BoxHandler(int numOfBoxes, Box**boxes)
			:numOfBoxes(numOfBoxes),boxes(boxes)
		{}
      
		void setBox(int i)
      {
         switch(boxes[i]->checkState () )
         {
            case Qt::Unchecked:
				{
                boxes[0]->setCheckState(Qt::Checked);
				}break;

				case Qt::Checked:
				{
					for(int j=0;j<numOfBoxes;j++)
               {
                  if(j==i);
						else boxes[j]->setCheckState(Qt::Unchecked);
					}
				}break;
			}
		}      

   private:
     int numOfBoxes;
     Box**boxes;
};

void Box::sendToHandler(int i)
{
   (*Handler)->setBox(num);
}

class My:public QWidget
{
   public:
    My()
		:QWidget(0)
	{
      BoxHandler** Handler=new BoxHandler*();
      Box**boxes=new Box*[3];
      boxes[0]=new Box(Handler,"a",0);
      boxes[0]->setCheckState(Qt::Checked);
		boxes[1]=new Box(Handler,"b",1);
		boxes[2]=new Box(Handler,"c",2);
      *Handler=new BoxHandler(3,boxes);

      QVBoxLayout*layout=new QVBoxLayout;
      layout->addWidget(boxes[0]);
	   layout->addWidget(boxes[1]);
	   layout->addWidget(boxes[2]);

      setLayout(layout);
      
   }
};


   
     
int main(int argc, char*argv[])
{
   QApplication*app=new QApplication(argc,argv);
   My my;
   my.show();
   
   app->exec();
}