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Watch stores time in hours:minutes:seconds struct Watch { hours hrs ; minutes min ; seconds sec ; //! Zero constructor. Zeros hours, minutes, and seconds explicit Watch () : hrs ( std :: chrono :: duration_cast < hours > ( clock :: duration :: zero ()) ), min ( std :: chrono :: duration_cast < minutes > ( clock :: duration :: zero () ) ), sec ( std :: chrono :: duration_cast < seconds > ( clock :: duration :: zero () ) ) {} //!