std::chrono::operator/(calendar)
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Defined in header
<chrono>
year_monthconstexpr auto operator/( const std::chrono::year & y,
(1)
(since C++20)
const std::chrono::month & m ) noexcept
constexpr auto operator/( const std::chrono::year & y, int m ) noexcept
-> std::chrono::year_month ;
(2)
(since C++20)
-> std::chrono::year_month ;
month_dayconstexpr auto operator/( const std::chrono::month & m,
(3)
(since C++20)
const std::chrono::day & d ) noexcept
constexpr auto operator/( const std::chrono::month & m, int d ) noexcept
-> std::chrono::month_day ;
(4)
(since C++20)
-> std::chrono::month_day ;
constexpr auto operator/( int m, const std::chrono::day & d ) noexcept
-> std::chrono::month_day ;
(5)
(since C++20)
-> std::chrono::month_day ;
constexpr auto operator/( const std::chrono::day & d,
(6)
(since C++20)
const std::chrono::month & m ) noexcept
constexpr auto operator/( const std::chrono::day & d, int m ) noexcept
-> std::chrono::month_day ;
(7)
(since C++20)
-> std::chrono::month_day ;
month_day_lastconstexpr auto operator/( const std::chrono::month & m,
(8)
(since C++20)
std::chrono::last_spec ) noexcept
constexpr auto operator/( int m, std::chrono::last_spec ) noexcept
-> std::chrono::month_day_last ;
(9)
(since C++20)
-> std::chrono::month_day_last ;
constexpr auto operator/( std::chrono::last_spec,
(10)
(since C++20)
const std::chrono::month & m ) noexcept
constexpr auto operator/( std::chrono::last_spec, int m ) noexcept
-> std::chrono::month_day_last ;
(11)
(since C++20)
-> std::chrono::month_day_last ;
month_weekdayconstexpr auto operator/( const std::chrono::month & m,
(12)
(since C++20)
const std::chrono::weekday_indexed & wdi ) noexcept
constexpr auto operator/( int m, const std::chrono::weekday_indexed & wdi ) noexcept
-> std::chrono::month_weekday ;
(13)
(since C++20)
-> std::chrono::month_weekday ;
constexpr auto operator/( const std::chrono::weekday_indexed & wdi,
(14)
(since C++20)
const std::chrono::month & m ) noexcept
constexpr auto operator/( const std::chrono::weekday_indexed & wdi, int m ) noexcept
-> std::chrono::month_weekday ;
(15)
(since C++20)
-> std::chrono::month_weekday ;
month_weekday_lastconstexpr auto operator/( const std::chrono::month & m,
(16)
(since C++20)
const std::chrono::weekday_last & wdl ) noexcept
constexpr auto operator/( int m, const std::chrono::weekday_last & wdl ) noexcept
-> std::chrono::month_weekday_last ;
(17)
(since C++20)
-> std::chrono::month_weekday_last ;
constexpr auto operator/( const std::chrono::weekday_last & wdl,
(18)
(since C++20)
const std::chrono::month & m ) noexcept
constexpr auto operator/( const std::chrono::weekday_last & wdl, int m ) noexcept
-> std::chrono::month_weekday_last ;
(19)
(since C++20)
-> std::chrono::month_weekday_last ;
year_month_dayconstexpr auto operator/( const std::chrono::year_month & ym,
(20)
(since C++20)
const std::chrono::day & d ) noexcept
constexpr auto operator/( const std::chrono::year_month & ym, int d ) noexcept
-> std::chrono::year_month_day ;
(21)
(since C++20)
-> std::chrono::year_month_day ;
constexpr auto operator/( const std::chrono::year & y,
(22)
(since C++20)
const std::chrono::month_day & md ) noexcept
constexpr auto operator/( int y, const std::chrono::month_day & md ) noexcept
-> std::chrono::year_month_day ;
(23)
(since C++20)
-> std::chrono::year_month_day ;
constexpr auto operator/( const std::chrono::month_day & md,
(24)
(since C++20)
const std::chrono::year & y ) noexcept
constexpr auto operator/( const std::chrono::month_day & md, int y ) noexcept
-> std::chrono::year_month_day ;
(25)
(since C++20)
-> std::chrono::year_month_day ;
year_month_day_lastconstexpr auto operator/( const std::chrono::year_month & ym,
(26)
(since C++20)
std::chrono::last_spec ) noexcept
constexpr auto operator/( const std::chrono::year & y,
(27)
(since C++20)
const std::chrono::month_day_last & mdl ) noexcept
constexpr auto operator/( int y, const std::chrono::month_day_last & mdl ) noexcept
-> std::chrono::year_month_day_last ;
(28)
(since C++20)
-> std::chrono::year_month_day_last ;
constexpr auto operator/( const std::chrono::month_day_last & mdl,
(29)
(since C++20)
const std::chrono::year & y ) noexcept
constexpr auto operator/( const std::chrono::month_day_last & mdl, int y ) noexcept
-> std::chrono::year_month_day_last ;
(30)
(since C++20)
-> std::chrono::year_month_day_last ;
year_month_weekdayconstexpr auto operator/( const std::chrono::year_month & ym,
(31)
(since C++20)
const std::chrono::weekday_indexed & wdi ) noexcept
constexpr auto operator/( const std::chrono::year & y,
(32)
(since C++20)
const std::chrono::month_weekday & mwd ) noexcept
constexpr auto operator/( int y, const std::chrono::month_weekday & mwd ) noexcept
-> std::chrono::year_month_weekday ;
(33)
(since C++20)
-> std::chrono::year_month_weekday ;
constexpr auto operator/( const std::chrono::month_weekday & mwd,
(34)
(since C++20)
const std::chrono::year & y ) noexcept
constexpr auto operator/( const std::chrono::month_weekday & mwd, int y ) noexcept
-> std::chrono::year_month_weekday ;
(35)
(since C++20)
-> std::chrono::year_month_weekday ;
year_month_weekday_lastconstexpr auto operator/( const std::chrono::year_month & ym,
(36)
(since C++20)
const std::chrono::weekday_last & wdl ) noexcept
constexpr auto operator/( const std::chrono::year & y,
(37)
(since C++20)
const std::chrono::month_weekday_last & mwdl ) noexcept
constexpr auto operator/( int y, const std::chrono::month_weekday_last & mwdl ) noexcept
-> std::chrono::year_month_weekday_last ;
(38)
(since C++20)
-> std::chrono::year_month_weekday_last ;
constexpr auto operator/( const std::chrono::month_weekday_last & mwdl,
(39)
(since C++20)
const std::chrono::year & y ) noexcept
constexpr auto operator/( const std::chrono::month_weekday_last & mwdl, int y ) noexcept
-> std::chrono::year_month_weekday_last ;
(40)
(since C++20)
-> std::chrono::year_month_weekday_last ;
These operator/ overloads provide a conventional syntax for the creation of Proleptic Gregorian calendar dates.
For creation of a full date, any of the following three orders are accepted:
-
year/month/day, -
month/day/year, -
day/month/year.
In each case day can replaced with one of:
- std::chrono::last, for the last day of the month;
-
weekday[i], for theith weekday of the month; -
weekday[std::chrono::last], for the last weekday of the month.
A plain integer is accepted if its meaning is unambiguous from the types of other operands: 2005y/4/5 is allowed, but 5/April/2005 is not.
Partial-date types (year_month, month_day, etc.) can be created by not applying the second operator/ in any of the three orders.
[edit] Return value
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())
[edit] Example
Run this code
#include <chrono> using namespace std::chrono; constexpr auto ym{2021y/8}; static_assert(ym == year_month(year(2021), August)); constexpr auto md{9/15d}; static_assert(md == month_day(September, day(15))); constexpr auto mdl{October/last}; static_assert(mdl == month_day_last(month(10))); constexpr auto mw{11/Monday[3]}; static_assert(mw == month_weekday(November, Monday[3])); constexpr auto mwdl{December/Sunday[last]}; static_assert(mwdl == month_weekday_last(month(12), weekday_last(Sunday))); // Those 3 year/month/day orders that people actually use on this planet and beyond: constexpr auto ymd{year(2021)/January/day(23)}; static_assert(ymd == month{1}/23/2021); static_assert(ymd == day{23}/1/2021); static_assert(ymd == year_month_day(2021y, month(January), 23d)); int main() {}