An example usage of QStandardItemModel to create a table:
 QStandardItemModel model(4, 4);
 for (int row = 0; row < 4; ++row) {
     for (int column = 0; column < 4; ++column) {
         QStandardItem *item = new QStandardItem(QString("row %0, column %1").arg(row).arg(column));
         model.setItem(row, column, item);
     }
 }

An example usage of QStandardItemModel to create a tree:
 QStandardItemModel model;
 QStandardItem *parentItem = model.invisibleRootItem();
 for (int i = 0; i < 4; ++i) {
     QStandardItem *item = new QStandardItem(QString("item %0").arg(i));
     parentItem->appendRow(item);
     parentItem = item;
 }

An example usage of QStandardItemModel to create a tree:
        QStandardItemModel *model = new QStandardItemModel();
        QModelIndex parent;
        for (int i = 0; i < 4; ++i) {
            parent = model->index(0, 0, parent);
            model->insertRows(0, 1, parent);
            model->insertColumns(0, 1, parent);
            QModelIndex index = model->index(0, 0, parent);
            model->setData(index, i);
        }