27 Time library [time]

27.4 Time-related traits [time.traits]

27.4.2 duration_­values [time.traits.duration.values]

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template<class Rep> struct duration_values { public: static constexpr Rep zero() noexcept; static constexpr Rep min() noexcept; static constexpr Rep max() noexcept; };
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The duration template uses the duration_­values trait to construct special values of the duration's representation (Rep).
This is done because the representation might be a class type with behavior which requires some other implementation to return these special values.
In that case, the author of that class type should specialize duration_­values to return the indicated values.
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static constexpr Rep zero() noexcept;
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Returns: Rep(0).
[Note
:
Rep(0) is specified instead of Rep() because Rep() may have some other meaning, such as an uninitialized value.
— end note
]
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Remarks: The value returned shall be the additive identity.
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static constexpr Rep min() noexcept;
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Returns: numeric_­limits<Rep>​::​lowest().
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Remarks: The value returned shall compare less than or equal to zero().
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static constexpr Rep max() noexcept;
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Returns: numeric_­limits<Rep>​::​max().
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Remarks: The value returned shall compare greater than zero().