30 Time library [time]

30.6 Class template time_point [time.point]

30.6.2 Constructors [time.point.cons]

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constexpr time_point();
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Effects: Initializes 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: Initializes 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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Constraints: is_convertible_v<Duration2, duration> is true.
4
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Effects: Initializes d_ with t.time_since_epoch().