std::chrono::year_month_weekday_last::operator sys_days, std::chrono::year_month_weekday_last::operator local_days
constexpr operator std::chrono::sys_days() const noexcept; |
(1) | (since C++20) |
explicit constexpr operator std::chrono::local_days() const noexcept; |
(2) | (since C++20) |
Converts *this to a std::chrono::time_point representing the same date as this year_month_weekday_last.
1) If
ok() is
true, returns a
sys_days that represents the last
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
#include <iostream>
#include <chrono>
using namespace std::chrono;
int main()
{
std::cout << std::boolalpha;
constexpr auto ymwdl {Tuesday[last]/11/2021};
static_assert(static_cast<local_days>(ymwdl) ==
static_cast<local_days>(November/30/2021));
// convert from field-based to serial-based to add days
constexpr auto sd = static_cast<sys_days>(ymwdl);
constexpr year_month_day ymd {sd + days(10)};
std::cout << (ymd == December/10/2021) << '\n';
}
Output:
true
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