Separator in box layout

Is there an easy way to get a thin line between two widgets in a box layout?
(such as the one between the menu bar and the central widget in a QMainWindow)

Why not use a QFrame in the shape of a line?

Code:

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QFrame* line = new QFrame();
line->setFrameShape(QFrame::HLine);
line->setFrameShadow(QFrame::Sunken);
boxLayout->addWidget(line);

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You can put that into the layout.