[time.duration.alg] (original) (raw)
30 Time library [time]
30.5 Class template duration [time.duration]
30.5.10 Algorithms [time.duration.alg]
template<class Rep, class Period> constexpr duration<Rep, Period> abs(duration<Rep, Period> d);
Constraints: numeric_limits<Rep>β::βis_signed is true.
Returns: If d >= d.zero(), return d, otherwise return -d.