cannot instantiate abstract class

[Higgs]

Hello all.
I'm reading Johan Thelin's "Foundation of Qt Development" And I'm at Costum View. It is little bit difficult and i write code such as in the book.
I Dropped TableView on a form and then:
MainWindow Constructor:

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);


QStandardItemModel *model = new QStandardItemModel(10,2);
for(int i = 0; i < 10; i++){
QStandardItem *item = new QStandardItem(QString("Row: %1").arg(i));
item->setEditable(false);
model->setItem(i,0,item);

model->setItem(i,1,new QStandardItem(QString::number((i*30)%100)));
}

ui->tableView->setModel(model);

BarDelegate dg;
ui->tableView->setItemDelegateForColumn(1,&dg);
}

But I get such error:
9910

Here is BarDelegate declaration and definition:

class BarDelegate : public QAbstractItemDelegate
{
public:
BarDelegate(QObject *parent = 0);

void paint(QPainter *painter,const QStyleOptionViewItem &option,const QModelIndex *index) const;

QSize sizeHint(const QStyleOptionViewItem *option,const QModelIndex &index) const;
};


#include "bardelegate.h"

BarDelegate::BarDelegate(QObject *parent)
{

}
QSize BarDelegate::sizeHint(const QStyleOptionViewItem *option, const QModelIndex &index) const
{
return QSize(45,15);
}

void BarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex *index) const
{
if(option.state & QStyle::State_Selected)
painter->fillRect(option.rect,option.palette.highlight() );

int value = index->model()->data(index,Qt::DisplayRole).toInt();
double factor = (double)value/100.0;

painter->save();

if(factor > 1)
{
painter->setBrush(Qt::red);
factor = 1;
}
else
painter->setBrush(QColor(0,(int)(factor*255),255-(int)(factor*255)));

painter->setPen(Qt::black);
painter->drawRect(option.rect.x()+2,option.rect.y()+2,(int) (factor*(option.rect.width()-5)),option.rect.height()-5);

painter->restore();
}

[Higgs]

Solved!!! :)
I just didn't correctly override paint and sizeHint methods :)

As it seems pure virtual functions(paint and sizeHint) has been changed after that book released.
Differences is in parameters.

[ChrisW67]

The delegate class paint() function has never taken a pointer to QModelIndex as its third argument, and the sizeHint() has never taken a pointer as its first argument. These look like typos in the book.