30 Time library [time]

30.14 Hash support [time.hash]

template<class Rep, class Period> struct hash<chrono::duration<Rep, Period>>;

The specialization hash<chrono::duration<Rep, Period>> is enabled ([unord.hash]) if and only if

hash<Rep> is enabled.

The member functions are not guaranteed to be noexcept.

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template<class Clock, class Duration> struct hash<chrono::time_point<Clock, Duration>>;

The specialization hash<chrono::time_point<Clock, Duration>> is enabled ([unord.hash]) if and only if hash<Duration> is enabled.

The member functions are not guaranteed to be noexcept.

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template<> struct hash<chrono::day>;
template<> struct hash<chrono::month>;
template<> struct hash<chrono::year>;
template<> struct hash<chrono::weekday>;
template<> struct hash<chrono::weekday_indexed>;
template<> struct hash<chrono::weekday_last>;
template<> struct hash<chrono::month_day>;
template<> struct hash<chrono::month_day_last>;
template<> struct hash<chrono::month_weekday>;
template<> struct hash<chrono::month_weekday_last>;
template<> struct hash<chrono::year_month>;
template<> struct hash<chrono::year_month_day>;
template<> struct hash<chrono::year_month_day_last>;
template<> struct hash<chrono::year_month_weekday>;
template<> struct hash<chrono::year_month_weekday_last>;

The specializations are enabled ([unord.hash]).

[Note 1:

All the hash<Key> specializations listed above meet the Cpp17Hash requirements, even when called on objects k of type Key such that k.ok() is false.

— end note]

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template<class Duration, class TimeZonePtr>
  struct hash<chrono::zoned_time<Duration, TimeZonePtr>>;

The specialization hash<chrono::zoned_time<Duration, TimeZonePtr>> is enabled ([unord.hash]) if and only if hash<Duration> is enabled and hash<TimeZonePtr> is enabled.

The member functions are not guaranteed to be noexcept.

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template<> struct hash<chrono::leap_second>;

The specialization is enabled ([unord.hash]).