25 Time library [time]

25.5 Class template duration [time.duration]

25.5.4 Special values [time.duration.special]

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static constexpr duration zero();
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Returns: duration(duration_­values<rep>​::​zero()).
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static constexpr duration min();
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Returns: duration(duration_­values<rep>​::​min()).
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static constexpr duration max();
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Returns: duration(duration_­values<rep>​::​max()).