std::chrono::operator/ (日历)

< cpp‎ | chrono
 
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C 风格日期和时间
 
year_month
constexpr auto operator/(const std::chrono::year& y,

                         const std::chrono::month& m) noexcept

    -> std::chrono::year_month;
 (1) (C++20 起)
constexpr auto operator/(const std::chrono::year& y, int m) noexcept
    -> std::chrono::year_month;
 (2) (C++20 起)
month_day
constexpr auto operator/(const std::chrono::month& m,

                         const std::chrono::day& d) noexcept

    -> std::chrono::month_day;
 (3) (C++20 起)
constexpr auto operator/(const std::chrono::month& m, int d) noexcept
    -> std::chrono::month_day;
 (4) (C++20 起)
constexpr auto operator/(int m, const std::chrono::day& d) noexcept
    -> std::chrono::month_day;
 (5) (C++20 起)
constexpr auto operator/(const std::chrono::day& d,

                         const std::chrono::month& m) noexcept

   -> std::chrono::month_day;
 (6) (C++20 起)
constexpr auto operator/(const std::chrono::day& d, int m) noexcept
    -> std::chrono::month_day;
 (7) (C++20 起)
month_day_last
constexpr auto operator/(const std::chrono::month& m,

                         std::chrono::last_spec) noexcept

    -> std::chrono::month_day_last;
 (8) (C++20 起)
constexpr auto operator/(int m, std::chrono::last_spec) noexcept
    -> std::chrono::month_day_last;
 (9) (C++20 起)
constexpr auto operator/(std::chrono::last_spec,

                         const std::chrono::month& m) noexcept

    -> std::chrono::month_day_last;
 (10) (C++20 起)
constexpr auto operator/(std::chrono::last_spec, int m) noexcept
    -> std::chrono::month_day_last;
 (11) (C++20 起)
month_weekday
constexpr auto operator/(const std::chrono::month& m,

                         const std::chrono::weekday_indexed& wdi) noexcept

    -> std::chrono::month_weekday;
 (12) (C++20 起)
constexpr auto operator/(int m, const std::chrono::weekday_indexed& wdi) noexcept
    -> std::chrono::month_weekday;
 (13) (C++20 起)
constexpr auto operator/(const std::chrono::weekday_indexed& wdi,

                         const std::chrono::month& m) noexcept

    -> std::chrono::month_weekday;
 (14) (C++20 起)
constexpr auto operator/(const std::chrono::weekday_indexed& wdi, int m) noexcept
    -> std::chrono::month_weekday;
 (15) (C++20 起)
month_weekday_last
constexpr auto operator/(const std::chrono::month& m,

                         const std::chrono::weekday_last& wdl) noexcept

    -> std::chrono::month_weekday_last;
 (16) (C++20 起)
constexpr auto operator/(int m, const std::chrono::weekday_last& wdl) noexcept
    -> std::chrono::month_weekday_last;
 (17) (C++20 起)
constexpr auto operator/(const std::chrono::weekday_last& wdl,

                         const std::chrono::month& m) noexcept

    -> std::chrono::month_weekday_last;
 (18) (C++20 起)
constexpr auto operator/(const std::chrono::weekday_last& wdl, int m) noexcept
    -> std::chrono::month_weekday_last;
 (19) (C++20 起)
year_month_day
constexpr auto operator/(const std::chrono::year_month& ym,

                         const std::chrono::day& d) noexcept

    -> std::chrono::year_month_day;
 (20) (C++20 起)
constexpr auto operator/(const std::chrono::year_month& ym, int d) noexcept
    -> std::chrono::year_month_day;
 (21) (C++20 起)
constexpr auto operator/(const std::chrono::year& y,

                         const std::chrono::month_day& md) noexcept

    -> std::chrono::year_month_day;
 (22) (C++20 起)
constexpr auto operator/(int y, const std::chrono::month_day& md) noexcept
    -> std::chrono::year_month_day;
 (23) (C++20 起)
constexpr auto operator/(const std::chrono::month_day& md,

                         const std::chrono::year& y) noexcept

    -> std::chrono::year_month_day;
 (24) (C++20 起)
constexpr auto operator/(const std::chrono::month_day& md, int y) noexcept
    -> std::chrono::year_month_day;
 (25) (C++20 起)
year_month_day_last
constexpr auto operator/(const std::chrono::year_month& ym,

                         std::chrono::last_spec) noexcept

    -> std::chrono::year_month_day_last;
 (26) (C++20 起)
constexpr auto operator/(const std::chrono::year& y,

                         const std::chrono::month_day_last& mdl) noexcept

    -> std::chrono::year_month_day_last;
 (27) (C++20 起)
constexpr auto operator/(int y, const std::chrono::month_day_last& mdl) noexcept
    -> std::chrono::year_month_day_last;
 (28) (C++20 起)
constexpr auto operator/(const std::chrono::month_day_last& mdl,

                         const std::chrono::year& y) noexcept

    -> std::chrono::year_month_day_last;
 (29) (C++20 起)
constexpr auto operator/(const std::chrono::month_day_last& mdl, int y) noexcept
    -> std::chrono::year_month_day_last;
 (30) (C++20 起)
year_month_weekday
constexpr auto operator/(const std::chrono::year_month& ym,

                         const std::chrono::weekday_indexed& wdi) noexcept

    -> std::chrono::year_month_weekday;
 (31) (C++20 起)
constexpr auto operator/(const std::chrono::year& y,

                         const std::chrono::month_weekday& mwd) noexcept

    -> std::chrono::year_month_weekday;
 (32) (C++20 起)
constexpr auto operator/(int y, const std::chrono::month_weekday& mwd) noexcept
    -> std::chrono::year_month_weekday;
 (33) (C++20 起)
constexpr auto operator/(const std::chrono::month_weekday& mwd,

                         const std::chrono::year& y) noexcept

    -> std::chrono::year_month_weekday;
 (34) (C++20 起)
constexpr auto operator/(const std::chrono::month_weekday& mwd, int y) noexcept
    -> std::chrono::year_month_weekday;
 (35) (C++20 起)
year_month_weekday_last
constexpr auto operator/(const std::chrono::year_month& ym,

                         const std::chrono::weekday_last& wdl) noexcept

    -> std::chrono::year_month_weekday_last;
 (36) (C++20 起)
constexpr auto operator/(const std::chrono::year& y,

                         const std::chrono::month_weekday_last& mwdl) noexcept

    -> std::chrono::year_month_weekday_last;
 (37) (C++20 起)
constexpr auto operator/(int y, const std::chrono::month_weekday_last& mwdl) noexcept
    -> std::chrono::year_month_weekday_last;
 (38) (C++20 起)
constexpr auto operator/(const std::chrono::month_weekday_last& mwdl,

                         const std::chrono::year& y) noexcept

    -> std::chrono::year_month_weekday_last;
 (39) (C++20 起)
constexpr auto operator/(const std::chrono::month_weekday_last& mwdl, int y) noexcept
    -> std::chrono::year_month_weekday_last;
 (40) (C++20 起)

这些 operator/ 为创建格里高利历日期提供约定语法。

对于创建完整日期，任何下列三种顺序都可接受：

  • year/month/day
  • month/day/year
  • day/month/year

每种情况中，能以下列之一替换 day ：

  • std::chrono::last ，对于月的最后一日；
  • weekday[i] ，对于月的第 i 个 weekday ；
  • weekday[std::chrono::last] ，对于该月的最后一个 weekday 。

若单纯的整数的含义相对于其他运算数的类型无歧义，则可接受它：允许 2005y/4/5 ，但不允许 5/April/2005 。

能够不以三种顺序之一应用第二个 operator/ 创建部分日期类型（ year_month 、 month_day 等）。

返回值

1) std::chrono::year_month(y, m)
2) std::chrono::year_month(y, std::chrono::month(m))
3,6) std::chrono::month_day(m, d)
4) std::chrono::month_day(m, std::chrono::day(d))
5,7) std::chrono::month_day(std::chrono::month(m), d)
8,10) std::chrono::month_day_last(m)
9,11) std::chrono::month_day_last(std::chrono::month(m))
12,14) std::chrono::month_weekday(m, wdi)
13,15) std::chrono::month_weekday(std::chrono::month(m), wdi)
16,18) std::chrono::month_weekday_last(m, wdl)
17,19) std::chrono::month_weekday_last(std::chrono::month(m), wdl)
20) std::chrono::year_month_day(ym.year(), ym.month(), d)
21) std::chrono::year_month_day(ym.year(), ym.month(), std::chrono::day(d))
22,24) std::chrono::year_month_day(y, md.month(), md.day())
23,25) std::chrono::year_month_day(std::chrono::year(y), md.month(), md.day())
26) std::chrono::year_month_day_last(ym.year(), std::chrono::month_day_last(ym.month()))
27,29) std::chrono::year_month_day_last(y, mdl)
28,30) std::chrono::year_month_day_last(std::chrono::year(y), mdl)
31) std::chrono::year_month_weekday(ym.year(), ym.month(), wdi)
32,34) std::chrono::year_month_weekday(y, mwd.month(), mwd.weekday_indexed())
33,35) std::chrono::year_month_weekday(std::chrono::year(y), mwd.month(), mwd.weekday_indexed())
36) std::chrono::year_month_weekday_last(ym.year(), ym.month(), wdl)
37,39) std::chrono::year_month_weekday_last(y, mwdl.month(), mwdl.weekday_last())
38,40) std::chrono::year_month_weekday_last(std::chrono::year(y), mwdl.month(), mwdl.weekday_last())

示例

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原因：暂无示例