std::chrono::operator/ (calendar)
Defined in header <chrono> |
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---|---|---|
year_month |
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constexpr auto operator/( const std::chrono::year& y, const std::chrono::month& m ) noexcept -> std::chrono::year_month; |
(1) | (since C++20) |
constexpr auto operator/( const std::chrono::year& y, int m ) noexcept -> std::chrono::year_month; |
(2) | (since C++20) |
month_day |
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constexpr auto operator/( const std::chrono::month& m, const std::chrono::day& d ) noexcept -> std::chrono::month_day; |
(3) | (since C++20) |
constexpr auto operator/( const std::chrono::month& m, int d ) noexcept -> std::chrono::month_day; |
(4) | (since C++20) |
constexpr auto operator/( int m, const std::chrono::day& d ) noexcept -> std::chrono::month_day; |
(5) | (since C++20) |
constexpr auto operator/( const std::chrono::day& d, const std::chrono::month& m ) noexcept -> std::chrono::month_day; |
(6) | (since C++20) |
constexpr auto operator/( const std::chrono::day& d, int m ) noexcept -> std::chrono::month_day; |
(7) | (since C++20) |
month_day_last |
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constexpr auto operator/( const std::chrono::month& m, std::chrono::last_spec ) noexcept -> std::chrono::month_day_last; |
(8) | (since C++20) |
constexpr auto operator/( int m, std::chrono::last_spec ) noexcept -> std::chrono::month_day_last; |
(9) | (since C++20) |
constexpr auto operator/( std::chrono::last_spec, const std::chrono::month& m ) noexcept -> std::chrono::month_day_last; |
(10) | (since C++20) |
constexpr auto operator/( std::chrono::last_spec, int m ) noexcept -> std::chrono::month_day_last; |
(11) | (since C++20) |
month_weekday |
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constexpr auto operator/( const std::chrono::month& m, const std::chrono::weekday_indexed& wdi ) noexcept -> std::chrono::month_weekday; |
(12) | (since C++20) |
constexpr auto operator/( int m, const std::chrono::weekday_indexed& wdi ) noexcept -> std::chrono::month_weekday; |
(13) | (since C++20) |
constexpr auto operator/( const std::chrono::weekday_indexed& wdi, const std::chrono::month& m ) noexcept -> std::chrono::month_weekday; |
(14) | (since C++20) |
constexpr auto operator/( const std::chrono::weekday_indexed& wdi, int m ) noexcept -> std::chrono::month_weekday; |
(15) | (since C++20) |
month_weekday_last |
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constexpr auto operator/( const std::chrono::month& m, const std::chrono::weekday_last& wdl ) noexcept -> std::chrono::month_weekday_last; |
(16) | (since C++20) |
constexpr auto operator/( int m, const std::chrono::weekday_last& wdl ) noexcept -> std::chrono::month_weekday_last; |
(17) | (since C++20) |
constexpr auto operator/( const std::chrono::weekday_last& wdl, const std::chrono::month& m ) noexcept -> std::chrono::month_weekday_last; |
(18) | (since C++20) |
constexpr auto operator/( const std::chrono::weekday_last& wdl, int m ) noexcept -> std::chrono::month_weekday_last; |
(19) | (since C++20) |
year_month_day |
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constexpr auto operator/( const std::chrono::year_month& ym, const std::chrono::day& d ) noexcept -> std::chrono::year_month_day; |
(20) | (since C++20) |
constexpr auto operator/( const std::chrono::year_month& ym, int d ) noexcept -> std::chrono::year_month_day; |
(21) | (since C++20) |
constexpr auto operator/( const std::chrono::year& y, const std::chrono::month_day& md ) noexcept -> std::chrono::year_month_day; |
(22) | (since C++20) |
constexpr auto operator/( int y, const std::chrono::month_day& md ) noexcept -> std::chrono::year_month_day; |
(23) | (since C++20) |
constexpr auto operator/( const std::chrono::month_day& md, const std::chrono::year& y ) noexcept -> std::chrono::year_month_day; |
(24) | (since C++20) |
constexpr auto operator/( const std::chrono::month_day& md, int y ) noexcept -> std::chrono::year_month_day; |
(25) | (since C++20) |
year_month_day_last |
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constexpr auto operator/( const std::chrono::year_month& ym, std::chrono::last_spec ) noexcept -> std::chrono::year_month_day_last; |
(26) | (since C++20) |
constexpr auto operator/( const std::chrono::year& y, const std::chrono::month_day_last& mdl ) noexcept -> std::chrono::year_month_day_last; |
(27) | (since C++20) |
constexpr auto operator/( int y, const std::chrono::month_day_last& mdl ) noexcept -> std::chrono::year_month_day_last; |
(28) | (since C++20) |
constexpr auto operator/( const std::chrono::month_day_last& mdl, const std::chrono::year& y ) noexcept -> std::chrono::year_month_day_last; |
(29) | (since C++20) |
constexpr auto operator/( const std::chrono::month_day_last& mdl, int y ) noexcept -> std::chrono::year_month_day_last; |
(30) | (since C++20) |
year_month_weekday |
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constexpr auto operator/( const std::chrono::year_month& ym, const std::chrono::weekday_indexed& wdi ) noexcept -> std::chrono::year_month_weekday; |
(31) | (since C++20) |
constexpr auto operator/( const std::chrono::year& y, const std::chrono::month_weekday& mwd ) noexcept -> std::chrono::year_month_weekday; |
(32) | (since C++20) |
constexpr auto operator/( int y, const std::chrono::month_weekday& mwd ) noexcept -> std::chrono::year_month_weekday; |
(33) | (since C++20) |
constexpr auto operator/( const std::chrono::month_weekday& mwd, const std::chrono::year& y ) noexcept -> std::chrono::year_month_weekday; |
(34) | (since C++20) |
constexpr auto operator/( const std::chrono::month_weekday& mwd, int y ) noexcept -> std::chrono::year_month_weekday; |
(35) | (since C++20) |
year_month_weekday_last |
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constexpr auto operator/( const std::chrono::year_month& ym, const std::chrono::weekday_last& wdl ) noexcept -> std::chrono::year_month_weekday_last; |
(36) | (since C++20) |
constexpr auto operator/( const std::chrono::year& y, const std::chrono::month_weekday_last& mwdl ) noexcept -> std::chrono::year_month_weekday_last; |
(37) | (since C++20) |
constexpr auto operator/( int y, const std::chrono::month_weekday_last& mwdl ) noexcept -> std::chrono::year_month_weekday_last; |
(38) | (since C++20) |
constexpr auto operator/( const std::chrono::month_weekday_last& mwdl, const std::chrono::year& y ) noexcept -> std::chrono::year_month_weekday_last; |
(39) | (since C++20) |
constexpr auto operator/( const std::chrono::month_weekday_last& mwdl, int y ) noexcept -> std::chrono::year_month_weekday_last; |
(40) | (since C++20) |
These operator/
overloads provide a conventional syntax for the creation of 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 the i-th 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.
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)
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())
Example
#include <iostream> #include <chrono> using namespace std::chrono; int main() { std::cout << std::boolalpha; // standard provides 2021y as option for std::chrono::year(2021) // standard provides 15d as option for std::chrono::day(15) constexpr auto ym {year(2021)/8}; std::cout << (ym == year_month(year(2021), August)) << ' '; constexpr auto md {9/day(15)}; std::cout << (md == month_day(September, day(15))) << ' '; constexpr auto mdl {October/last}; std::cout << (mdl == month_day_last(month(10))) << ' '; constexpr auto mw {11/Monday[3]}; std::cout << (mw == month_weekday(November, Monday[3])) << ' '; constexpr auto mwdl {December/Sunday[last]}; std::cout << (mwdl == month_weekday_last(month(12), weekday_last(Sunday))) << ' '; // Those three year/month/day orders that people actually use on this planet: constexpr auto ymd {year(2021)/January/day(23)}; static_assert(ymd == month{1}/23/2021); static_assert(ymd == day{23}/1/2021); std::cout << (ymd == year_month_day(2021y, month(January), 23d)) << '\n'; }
Output:
true true true true true true
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