30 Time library [time]

30.5 Class template duration [time.duration]

30.5.10 Algorithms [time.duration.alg]

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template<class Rep, class Period> constexpr duration<Rep, Period> abs(duration<Rep, Period> d);
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Constraints: numeric_limits<Rep>​::​is_signed is true.
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Returns: If d >= d.zero(), return d, otherwise return -d.