std::chrono::operator==,<=>(std::chrono::year_month_day_last)

 

C++

Compiler support

Freestanding and hosted

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Standard library headers

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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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Ranges library (C++20)

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Date and time library

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Filesystem library (C++17)

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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_day_last

Member functions

year_month_day_last::year_month_day_last

year_month_day_last::operator+=year_month_day_last::operator-=

year_month_day_last::yearyear_month_day_last::monthyear_month_day_last::dayyear_month_day_last::month_day_last

year_month_day_last::operator sys_daysyear_month_day_last::operator local_days

year_month_day_last::ok

Nonmember functions

operator==operator<=>

operator+operator-

operator<<

Helper classes

formatter<std::chrono::year_month_day_last>

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

 

Defined in header <chrono>
constexpr bool operator==( const std::chrono::year_month_day_last& x,                            const std::chrono::year_month_day_last& y ) noexcept;	(1)	(since C++20)
constexpr std::strong_ordering     operator<=>( const std::chrono::year_month_day_last& x,                  const std::chrono::year_month_day_last& y ) noexcept;	(2)	(since C++20)

Compares the two year_month_day_last values x and y. This is a lexicographical comparison: the year() is compared first, then month().

The <, <=, >, >=, and != operators are synthesized from operator<=> and operator== respectively.

Return value

1) x.year() == y.year() && x.month() == y.month()

2) x.year() <=> y.year() != 0 ? x.year() <=> y.year() : x.month() <=> y.month()

Notes

If both x and y represent valid dates (x.ok() && y.ok() == true), the result of the lexicographical comparison is consistent with the calendar order.

Example

Run this code

#include <cassert>
#include <chrono>
#include <iostream>
 
int main()
{
    auto ymdl1{11/std::chrono::last/2020};
    auto mdl{std::chrono::last/std::chrono::November};
    auto ymdl2{mdl/2020};
    assert(ymdl1 == ymdl2);
 
    ymdl1 -= std::chrono::months{2};
    ymdl2 -= std::chrono::months{1};
    assert(ymdl1 < ymdl2);
}

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