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Showing content from https://timsong-cpp.github.io/cppwp/n4659/time.point.cast below:

[time.point.cast]

23 General utilities library [utilities] 23.17 Time utilities [time] 23.17.6 Class template time_­point [time.point] 23.17.6.7 time_­point_­cast [time.point.cast]

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> time_point_cast(const time_point<Clock, Duration>& t);

Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration.

Returns:

time_point<Clock, ToDuration>(duration_cast<ToDuration>(t.time_since_epoch()))

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> floor(const time_point<Clock, Duration>& tp);

Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration.

Returns: time_­point<Clock, ToDuration>(floor<ToDuration>(tp.time_­since_­epoch())).

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> ceil(const time_point<Clock, Duration>& tp);

Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration.

Returns: time_­point<Clock, ToDuration>(ceil<ToDuration>(tp.time_­since_­epoch())).

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> round(const time_point<Clock, Duration>& tp);

Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration, and treat_­as_­floating_­point_­v<typename ToDuration​::​rep> is false.

Returns: time_­point<Clock, ToDuration>(round<ToDuration>(tp.time_­since_­epoch())).


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