tmp/tmp7vsars8x/{from.md → to.md}
RENAMED
|
@@ -0,0 +1,48 @@
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 |
+
#### Overview <a id="time.cal.ymd.overview">[[time.cal.ymd.overview]]</a>
|
| 2 |
+
|
| 3 |
+
``` cpp
|
| 4 |
+
namespace std::chrono {
|
| 5 |
+
class year_month_day {
|
| 6 |
+
chrono::year y_; // exposition only
|
| 7 |
+
chrono::month m_; // exposition only
|
| 8 |
+
chrono::day d_; // exposition only
|
| 9 |
+
|
| 10 |
+
public:
|
| 11 |
+
year_month_day() = default;
|
| 12 |
+
constexpr year_month_day(const chrono::year& y, const chrono::month& m,
|
| 13 |
+
const chrono::day& d) noexcept;
|
| 14 |
+
constexpr year_month_day(const year_month_day_last& ymdl) noexcept;
|
| 15 |
+
constexpr year_month_day(const sys_days& dp) noexcept;
|
| 16 |
+
constexpr explicit year_month_day(const local_days& dp) noexcept;
|
| 17 |
+
|
| 18 |
+
constexpr year_month_day& operator+=(const months& m) noexcept;
|
| 19 |
+
constexpr year_month_day& operator-=(const months& m) noexcept;
|
| 20 |
+
constexpr year_month_day& operator+=(const years& y) noexcept;
|
| 21 |
+
constexpr year_month_day& operator-=(const years& y) noexcept;
|
| 22 |
+
|
| 23 |
+
constexpr chrono::year year() const noexcept;
|
| 24 |
+
constexpr chrono::month month() const noexcept;
|
| 25 |
+
constexpr chrono::day day() const noexcept;
|
| 26 |
+
|
| 27 |
+
constexpr operator sys_days() const noexcept;
|
| 28 |
+
constexpr explicit operator local_days() const noexcept;
|
| 29 |
+
constexpr bool ok() const noexcept;
|
| 30 |
+
};
|
| 31 |
+
}
|
| 32 |
+
```
|
| 33 |
+
|
| 34 |
+
`year_month_day` represents a specific year, month, and day.
|
| 35 |
+
`year_month_day` is a field-based time point with a resolution of
|
| 36 |
+
`days`.
|
| 37 |
+
|
| 38 |
+
[*Note 1*: `year_month_day` supports `years`- and `months`-oriented
|
| 39 |
+
arithmetic, but not `days`-oriented arithmetic. For the latter, there is
|
| 40 |
+
a conversion to `sys_days`, which efficiently supports `days`-oriented
|
| 41 |
+
arithmetic. — *end note*]
|
| 42 |
+
|
| 43 |
+
`year_month_day` meets the *Cpp17EqualityComparable* (
|
| 44 |
+
[[cpp17.equalitycomparable]]) and *Cpp17LessThanComparable* (
|
| 45 |
+
[[cpp17.lessthancomparable]]) requirements.
|
| 46 |
+
|
| 47 |
+
`year_month_day` is a trivially copyable and standard-layout class type.
|
| 48 |
+
|