std::chrono::year_month_weekday::operatorsys_days,(3) | C++ Standard Libary | std::chrono::year_month_weekday::operatorsys_days,(3) |
NAME¶
std::chrono::year_month_weekday::operatorsys_days, - std::chrono::year_month_weekday::operatorsys_days,
Synopsis¶
constexpr operator std::chrono::sys_days() const noexcept;
(1) (since C++20)
explicit constexpr operator std::chrono::local_days() const (2)
(since C++20)
noexcept;
Converts *this to a std::chrono::time_point representing the same date as
this
year_month_weekday.
1) If year().ok() && month().ok() && weekday().ok():
* If index() == 0, returns a sys_days that represents the date 7 days
prior to the first weekday() of the year and month.
* Else, returns a sys_days that represents the date (index() - 1) * 7
days after the first weekday() of the year and month.
Otherwise, the returned value is unspecified.
2) Same as (1), but returns local_days instead of sys_days. Equivalent
to
local_days(sys_days(*this).time_since_epoch()).
Example¶
// Run this code
#include <iostream>
#include <chrono>
using namespace std::chrono;
int main()
{
std::cout << std::boolalpha;
constexpr auto ymwd {Tuesday[2]/11/2021};
// convert from field-based to serial-based to add hours
constexpr auto sd = sys_days{ymwd} + 24h;
constexpr auto ymd = floor<days>(sd);
std::cout << (ymd == November/10/2021) << '\n';
}
Output:¶
true
2022.07.31 | http://cppreference.com |