23 General utilities library [utilities]

23.17 Time utilities [time]

23.17.5 Class template duration [time.duration]

23.17.5.6 duration comparisons [time.duration.comparisons]

1
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In the function descriptions that follow, CT represents common_­type_­t<A, B>, where A and B are the types of the two arguments to the function.
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template <class Rep1, class Period1, class Rep2, class Period2> constexpr bool operator==(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
2
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Returns: CT(lhs).count() == CT(rhs).count().
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template <class Rep1, class Period1, class Rep2, class Period2> constexpr bool operator!=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
3
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Returns: !(lhs == rhs).
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template <class Rep1, class Period1, class Rep2, class Period2> constexpr bool operator<(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
4
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Returns: CT(lhs).count() < CT(rhs).count().
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template <class Rep1, class Period1, class Rep2, class Period2> constexpr bool operator<=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
5
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Returns: !(rhs < lhs).
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template <class Rep1, class Period1, class Rep2, class Period2> constexpr bool operator>(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
6
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Returns: rhs < lhs.
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template <class Rep1, class Period1, class Rep2, class Period2> constexpr bool operator>=(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
7
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Returns: !(lhs < rhs).