std::chrono::year_month_weekday::operator+=, std::chrono::year_month_weekday::operator-=
|
(1) | (since C++20) |
|
(2) | (since C++20) |
|
(3) | (since C++20) |
|
(4) | (since C++20) |
Modifies the time point *this represents by the duration dy or dm.
1) Equivalent to
*this = *this + dy;.
2) Equivalent to
*this = *this + dm;.
3) Equivalent to
*this = *this - dy;.
4) Equivalent to
*this = *this - dm;.
For durations that are convertible to both std::chrono::years and std::chrono::months, the years overloads (1,3) are preferred if the call would otherwise be ambiguous.
Example
#include <cassert>
#include <chrono>
#include <iostream>
int main()
{
auto ymwi{1/std::chrono::Wednesday[2]/2021};
std::cout << ymwi << '\n';
ymwi += std::chrono::years(5);
std::cout << ymwi << '\n';
assert(static_cast<std::chrono::year_month_day>(ymwi) ==
std::chrono::year(2026)/1/14);
ymwi -= std::chrono::months(1);
std::cout << ymwi << '\n';
assert(static_cast<std::chrono::year_month_day>(ymwi) ==
std::chrono::day(10)/12/2025);
}Output:
2021/Jan/Wed[2]
2026/Jan/Wed[2]
2025/Dec/Wed[2]See also
|
(C++20)
|
adds or subtracts a year_month_weekday and some number of years or months (function) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/chrono/year_month_weekday/operator_arith