NAME¶

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

Synopsis¶

constexpr std::chrono::year_month_weekday_last

operator+( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)

const std::chrono::months& dm ) noexcept;
constexpr std::chrono::year_month_weekday_last

operator+( const std::chrono::months& dm, (since C++20)

const std::chrono::year_month_weekday_last& ymwdl )
noexcept;
constexpr std::chrono::year_month_weekday_last

operator+( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)

const std::chrono::years& dy ) noexcept;
constexpr std::chrono::year_month_weekday_last

operator+( const std::chrono::years& dy, (since C++20)

const std::chrono::year_month_weekday_last& ymwdl )
noexcept;
constexpr std::chrono::year_month_weekday_last

operator-( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)

const std::chrono::months& dm ) noexcept;
constexpr std::chrono::year_month_weekday_last

operator-( const std::chrono::year_month_weekday_last& ymwdl, (since C++20)

const std::chrono::years& dy ) noexcept;

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);
}