tmp/tmpfqs07_s4/{from.md → to.md}
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| 1 |
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### Overview <a id="time.hms.overview">[[time.hms.overview]]</a>
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``` cpp
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namespace std::chrono {
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template<class Duration> class hh_mm_ss {
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public:
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static constexpr unsigned fractional_width = see below;
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using precision = see below;
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constexpr hh_mm_ss() noexcept : hh_mm_ss{Duration::zero()} {}
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constexpr explicit hh_mm_ss(Duration d);
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constexpr bool is_negative() const noexcept;
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constexpr chrono::hours hours() const noexcept;
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constexpr chrono::minutes minutes() const noexcept;
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constexpr chrono::seconds seconds() const noexcept;
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constexpr precision subseconds() const noexcept;
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constexpr explicit operator precision() const noexcept;
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constexpr precision to_duration() const noexcept;
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private:
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bool is_neg; // exposition only
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chrono::hours h; // exposition only
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chrono::minutes m; // exposition only
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chrono::seconds s; // exposition only
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precision ss; // exposition only
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};
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}
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```
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The `hh_mm_ss` class template splits a `duration` into a multi-field
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time structure *hours*:*minutes*:*seconds* and possibly *subseconds*,
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where *subseconds* will be a duration unit based on a non-positive power
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of 10. The `Duration` template parameter dictates the precision to which
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the time is split. A `hh_mm_ss` models negative durations with a
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distinct `is_negative` getter that returns `true` when the input
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duration is negative. The individual duration fields always return
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non-negative durations even when `is_negative()` indicates the structure
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is representing a negative duration.
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If `Duration` is not an instance of `duration`, the program is
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ill-formed.
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