29 Time library [time]

29.7 Clocks [time.clock]

29.7.10 time_­point conversions [time.clock.cast]

29.7.10.2 Identity conversions [time.clock.cast.id]

template<class Clock> struct clock_time_conversion<Clock, Clock> { template<class Duration> time_point<Clock, Duration> operator()(const time_point<Clock, Duration>& t) const; };
template<class Duration> time_point<Clock, Duration> operator()(const time_point<Clock, Duration>& t) const;
Returns: t.
template<> struct clock_time_conversion<system_clock, system_clock> { template<class Duration> sys_time<Duration> operator()(const sys_time<Duration>& t) const; };
template<class Duration> sys_time<Duration> operator()(const sys_time<Duration>& t) const;
Returns: t.
template<> struct clock_time_conversion<utc_clock, utc_clock> { template<class Duration> utc_time<Duration> operator()(const utc_time<Duration>& t) const; };
template<class Duration> utc_time<Duration> operator()(const utc_time<Duration>& t) const;
Returns: t.