std::chrono::year_month_weekday_last::operator sys_days, std::chrono::year_month_weekday_last::operator local_days
来自 cppreference.com
< cpp | chrono | year month weekday last
constexpr operator std::chrono::sys_days() const noexcept; |
(1) | (自 C++20 起) |
constexpr explicit operator std::chrono::local_days() const noexcept; |
(2) | (自 C++20 起) |
将 *this 转换为表示与该 year_month_weekday_last
相同日期的 std::chrono::time_point.
2) 与 (1) 相同,但返回
local_days
而不是 sys_days
。等效于 local_days(sys_days(*this).time_since_epoch()).[编辑] 示例
运行此代码
#include <chrono> #include <iostream> using namespace std::chrono; int main() { 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(42)}; std::cout << ymd << '\n'; }
输出
2022-01-11