How to impliment signal and slot when click on checkbox in first row of the QTreeWidgetitem

[Qt Enthusiast]

I have following code and I want to impliment signal and slot

int main(int argc, char **argv)
{
QApplication app(argc, argv);
QTreeWidget table;
table.setColumnCount(3);

QTreeWidgetItem* item = new QTreeWidgetItem();
item->setFlags(item->flags() | Qt::ItemIsUserCheckable | Qt::ItemIsSelectable);
item->setText(0,QString::number(0));
item->setText(1,QString::number(1));
item->setText(2,QString::number(2));

item->setCheckState(1,Qt::Checked);
item->setCheckState(2,Qt::Checked);

table.addTopLevelItem(item);

table.show();
return app.exec();
}

[koahnig]

@Qt-Enthusiast

You can't simply implement something in main and expect to get it to work with signal and slots. You need a class which inherits from QObject in order to benefit from signal slot mechanism.

I suggest that you are examining the examples e.g. http://doc.qt.io/qt-5/qtwidgets-itemviews-editabletreemodel-example.html
There you have a good start for some experiments. Using the debugger will help you to understand some more details about the functionality.