25 Time library [time]

25.6 Class template time_­point [time.point]

25.6.1 Constructors [time.point.cons]

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constexpr time_point();
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Effects: Constructs an object of type time_­point, initializing d_­ with duration​::​zero().
Such a time_­point object represents the epoch.
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constexpr explicit time_point(const duration& d);
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Effects: Constructs an object of type time_­point, initializing d_­ with d.
Such a time_­point object represents the epoch + d.
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template<class Duration2> constexpr time_point(const time_point<clock, Duration2>& t);
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Remarks: This constructor shall not participate in overload resolution unless Duration2 is implicitly convertible to duration.
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Effects: Constructs an object of type time_­point, initializing d_­ with t.time_­since_­epoch().