std::chrono::operator+, std::chrono::operator- (std::chrono::year_month_weekday_last)

 

C++

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Feature test macros (C++20)

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Concepts library (C++20)

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Metaprogramming library (C++11)

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Date and time library

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Filesystem library (C++17)

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Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Date and time library

Time point time_point (C++11) clock_time_conversion (C++20)   clock_cast (C++20) Duration duration (C++11) Clocks system_clock (C++11) steady_clock (C++11) is_clock (C++20) utc_clock (C++20) tai_clock (C++20) high_resolution_clock (C++11) gps_clock (C++20) file_clock (C++20) local_t (C++20) Time of day is_amis_pm (C++20)(C++20) make12make24 (C++20)(C++20) hh_mm_ss (C++20)

Calendar day (C++20) month (C++20) year (C++20) weekday (C++20) operator/ (C++20) year_month_day (C++20) year_month_day_last (C++20) year_month_weekday (C++20) year_month_weekday_last (C++20)   weekday_indexed (C++20) weekday_last (C++20) month_day (C++20) month_day_last (C++20) month_weekday (C++20) month_weekday_last (C++20) year_month (C++20) last_speclast (C++20)(C++20) chrono I/O parse (C++20)

Time zone tzdb (C++20) tzdb_list (C++20) get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20) sys_info (C++20) local_info (C++20) nonexistent_local_time (C++20) ambiguous_local_time (C++20) locate_zone (C++20) current_zone (C++20) time_zone (C++20) choose (C++20) zoned_traits (C++20) zoned_time (C++20) time_zone_link (C++20) leap_second (C++20) leap_second_info (C++20) get_leap_second_info (C++20) C-style date and time

 

std::chrono::year_month_weekday_last

Member functions

year_month_weekday_last::year_month_weekday_last

year_month_weekday_last::operator+=year_month_weekday_last::operator-=

year_month_weekday_last::yearyear_month_weekday_last::monthyear_month_weekday_last::weekdayyear_month_weekday_last::weekday_last

year_month_weekday_last::operator sys_daysyear_month_weekday_last::operator local_days

year_month_weekday_last::ok

Nonmember functions

operator==

operator+operator-

operator<<

Helper classes

formatter<std::chrono::year_month_weekday_last>

hash<std::chrono::year_month_weekday_last> (C++26)

 

constexpr std::chrono::year_month_weekday_last operator+( const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::months& dm ) noexcept;		(since C++20)
constexpr std::chrono::year_month_weekday_last operator+( const std::chrono::months& dm, const std::chrono::year_month_weekday_last& ymwdl ) noexcept;		(since C++20)
constexpr std::chrono::year_month_weekday_last operator+( const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::years& dy ) noexcept;		(since C++20)
constexpr std::chrono::year_month_weekday_last operator+( const std::chrono::years& dy, const std::chrono::year_month_weekday_last& ymwdl ) noexcept;		(since C++20)
constexpr std::chrono::year_month_weekday_last operator-( const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::months& dm ) noexcept;		(since C++20)
constexpr std::chrono::year_month_weekday_last operator-( const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::years& dy ) noexcept;		(since C++20)

1,2) Adds dm.count() months to the date represented by ymwdl. The result has the same year() and month() as std::chrono::year_month(ymwdl.year(), ymwdl.month()) + dm and the same weekday() as ymwdl.

3,4) Adds dy.count() years to the date represented by ymwdl. The result is equivalent to std::chrono::year_month_weekday_last(ymwdl.year() + dy, ymwdl.month(), ymwd.weekday_last()).

5) Subtracts dm.count() months from the date represented by ymwdl. Equivalent to ymwdl + -dm.

6) Subtracts dy.count() years from the date represented by ymwdl. Equivalent to ymwdl + -dy.

For durations that are convertible to both std::chrono::years and std::chrono::months, the years overloads (3,4,6) are preferred if the call would otherwise be ambiguous.

Example

Run this code

#include <cassert>
#include <chrono>
using namespace std::chrono;

int main()
{
    constexpr auto ymwdl1{Tuesday[last]/11/2021};
    auto ymwdl2 = ymwdl1;
    ymwdl2 = std::chrono::months(12) + ymwdl2;
    ymwdl2 = ymwdl2 - std::chrono::years(1);
    assert(ymwdl1 == ymwdl2);
}