[time.clock.cast.fn]

Constraints: At least one of the following clock time conversion expressions is well-formed:

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.

2

#

Mandates: Among the well-formed clock time conversion expressions from the above list, there is a unique best expression.

3

#

Returns: The best well-formed clock time conversion expression in the above list.

27 Time library [time]

27.7 Clocks [time.clock]

27.7.9 time_point conversions [time.clock.cast]

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

27 Time library [time]

27.7 Clocks [time.clock]

27.7.9 time_­point conversions [time.clock.cast]

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

27.7.9 time_point conversions [time.clock.cast]

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