tmp/tmp_wz8gclc/{from.md → to.md}
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###
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``` cpp
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template<class Rep, class Period>
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constexpr duration<Rep, Period> abs(duration<Rep, Period> d);
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```
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*
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unless `numeric_limits<Rep>::is_signed` is `true`.
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*Returns:* If `d >= d.zero()`, return `d`, otherwise return `-d`.
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### Algorithms <a id="time.duration.alg">[[time.duration.alg]]</a>
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``` cpp
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template<class Rep, class Period>
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constexpr duration<Rep, Period> abs(duration<Rep, Period> d);
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```
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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`.
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