tmp/tmpqatqz8d3/{from.md → to.md}
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| 1 |
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### `duration_values` <a id="time.traits.duration.values">[[time.traits.duration.values]]</a>
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``` cpp
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template<class Rep>
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struct duration_values {
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public:
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static constexpr Rep zero() noexcept;
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static constexpr Rep min() noexcept;
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static constexpr Rep max() noexcept;
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};
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```
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The `duration` template uses the `duration_values` trait to construct
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special values of the duration’s representation (`Rep`). This is done
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because the representation might be a class type with behavior which
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requires some other implementation to return these special values. In
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that case, the author of that class type should specialize
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`duration_values` to return the indicated values.
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``` cpp
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static constexpr Rep zero() noexcept;
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```
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*Returns:* `Rep(0)`.
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[*Note 1*: `Rep(0)` is specified instead of `Rep()` because `Rep()` may
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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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``` cpp
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static constexpr Rep min() noexcept;
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```
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*Returns:* `numeric_limits<Rep>::lowest()`.
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*Remarks:* The value returned shall compare less than or equal to
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`zero()`.
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``` cpp
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static constexpr Rep max() noexcept;
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```
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*Returns:* `numeric_limits<Rep>::max()`.
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*Remarks:* The value returned shall compare greater than `zero()`.
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