cannot instantiate abstract class

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:

Code:

---

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:
Attachment 9910

Here is BarDelegate declaration and definition:

Code:

---

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;
};

---

Code:

---

#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();
}

---

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.

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.