Error: No match for call to '(QPoint)()'

[GT Development]

Please find the code below

void testtab::mousePressEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        //QMouseEvent *e=static_cast<QMouseEvent *>(event);
        startPos = event->pos();
        if(isWindow())
        {
            p = event->globalPos() - startPos();
             msgBox.setText("is window");
             msgBox.exec();
        }
        else
        {
             p = event->pos();
             msgBox.setText("not window");
             msgBox.exec();
        }
    }
}

void testtab::mousePressEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        //QMouseEvent *e=static_cast<QMouseEvent *>(event);
        startPos = event->pos();
        if(isWindow())
        {
            p = event->globalPos() - startPos();
             msgBox.setText("is window");
             msgBox.exec();
        }
        else
        {
             p = event->pos();
             msgBox.setText("not window");
             msgBox.exec();
        }
    }
}

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