27 Time library [time]

27.4 Time-related traits [time.traits]

27.4.1 treat_­as_­floating_­point [time.traits.is.fp]

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template<class Rep> struct treat_as_floating_point : is_floating_point<Rep> { };
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The duration template uses the treat_­as_­floating_­point trait to help determine if a duration object can be converted to another duration with a different tick period.
If treat_­as_­floating_­point_­v<Rep> is true, then implicit conversions are allowed among durations.
Otherwise, the implicit convertibility depends on the tick periods of the durations.
[Note
:
The intention of this trait is to indicate whether a given class behaves like a floating-point type, and thus allows division of one value by another with acceptable loss of precision.
If treat_­as_­floating_­point_­v<Rep> is false, Rep will be treated as if it behaved like an integral type for the purpose of these conversions.
— end note
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