Quit action in MainWindow

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I'm attempting to close a form when quit is selected in the tool bar. The form has an action called actionQuit which is written as such in the MainWindow.cpp file:

void MainWindow::on_actionQuit_triggered()
    {
 
    }

void MainWindow::on_actionQuit_triggered()
    {

    }

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How do I actually call the form to close inside of this? do I reference it as "ui.something"? Sorry if this is a seemingly simple question, I just cannot find the answer on my own.

Thank you,
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