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; };

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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; };

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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; };

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template<class Duration>
  utc_time<Duration>
    operator()(const utc_time<Duration>& t) const;

Returns: t.