QDialogButtonBox button Ok not woking after connecting

Question

I have a mainWindow class that calls a function mainWIndow::ShowDialogBox() when double clicked on the QTabBar. The dialog box shows up, but it isn't connecting the buttons. I have the connect calls in ShowDialogBox. It gives me a red underline on connect saying

 no instance of overloaded function "MainWindow::connect" matches the argument list"

This is my code

bool MainWindow::eventFilter(QObject *object, QEvent *event)
 {
    if (object == mTabWidget->getTabBar() && event->type() == QEvent::MouseButtonDblClick) 
    {
        qDebug()<<"dblclk";

    ShowDialogBox();

    }

    return QObject::eventFilter(object, event);
}

//Show dialog box when double clicked on QTabBar
void MainWindow::ShowDialogBox(){

    QDialog dialog;
    QVBoxLayout layout(&dialog);
    QLineEdit editLine;
    layout.addWidget(&editLine);

     QDialogButtonBox *dialogButton = new QDialogButtonBox(QDialogButtonBox::Ok );
     connect(dialogButton, SIGNAL(accepted()), dialog, SLOT(accept())); //this 'connect' is underlined
     layout.addWidget(dialogButton);
     dialog.setLayout(&layout);


    if(dialog.exec() == QDialog::Accepted)
    {
        mTabWidget->setTabText(0, editLine.text());
    }

  }

I have added the signals and slot in mainWindow.h as

private slots:
    void accept();

signals:

    void accepted();

I have spend hours on this but no luck. I am new to Qt.

Answer 1

Line:

connect(dialogButton, SIGNAL(accepted()), dialog, SLOT(accept()));

should be:

connect(dialogButton, SIGNAL(accepted()), &dialog, SLOT(accept()));

Because the third parameter has to be a memory address(pointer).