Is flags a typdef?

[chuckle]

I've just dipped my toes into Qt and was wondering about the following.
Class QMessageBox defines public types including

enum StandardButton { Ok, Open, Save, Cancel, ..., ButtonMask }

enum StandardButton { Ok, Open, Save, Cancel, ..., ButtonMask }

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and

flags StandardButtons

flags StandardButtons

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What is flags? Is it a typedef?