25 Time library [time]

25.7 Clocks [time.clock]

25.7.9 time_­point conversions [time.clock.cast]

25.7.9.6 Function template clock_­cast [time.clock.cast.fn]

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template<class DestClock, class SourceClock, class Duration> auto clock_cast(const time_point<SourceClock, Duration>& t);
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Remarks: This function does not participate in overload resolution unless at least one of the following clock time conversion expressions is well-formed:
  • (1.1)
    clock_time_conversion<DestClock, SourceClock>{}(t)
  • (1.2)
    clock_time_conversion<DestClock, system_clock>{}(
    clock_time_conversion<system_clock, SourceClock>{}(t))
  • (1.3)
    clock_time_conversion<DestClock, utc_clock>{}(
    clock_time_conversion<utc_clock, SourceClock>{}(t))
  • (1.4)
    clock_time_conversion<DestClock, utc_clock>{}(
    clock_time_conversion<utc_clock, system_clock>{}(
        clock_time_conversion<system_clock, SourceClock>{}(t)))
  • (1.5)
    clock_time_conversion<DestClock, system_clock>{}(
    clock_time_conversion<system_clock, utc_clock>{}(
        clock_time_conversion<utc_clock, SourceClock>{}(t)))
A clock time conversion expression is considered better than another clock time conversion expression if it involves fewer operator() calls on clock_­time_­conversion specializations.
If, among the well-formed clock time conversion expressions from the above list, there is not a unique best expression, the clock_­cast is ambiguous and the program is ill-formed.
2
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Returns: The best well-formed clock time conversion expression in the above list.