int main (int argc, char *argv[])
{
    QVector<QString> vec;
    vec << "xxx" << "yyy" << "zzz";
    QVector<QString>::iterator it = vec.begin();
    qDebug() << "before loop";
    for (; it != vec.end(); ++it)
    {
        qDebug() << "Element:" << *it;
    }
}