std::chrono...day::weekday(3) C++ Standard Libary std::chrono...day::weekday(3) NAME std::chrono::weekday::weekday - std::chrono::weekday::weekday Synopsis weekday() = default; (1) (since C++20) constexpr explicit weekday( unsigned wd ) noexcept; (2) (since C++20) constexpr weekday( const std::chrono::sys_days& sd ) noexcept; (3) (since C++20) constexpr explicit weekday( const std::chrono::local_days& ld ) (4) (since C++20) noexcept; Constructs a weekday object. 1) Default constructor leaves the weekday value uninitialized. 2) Constructs a weekday object holding the weekday value wd. If wd == 7, the value held is 0. If wd > 255, the value held is unspecified. 3) Constructs a weekday object representing the day of the week sd cor- responds to. This constructor defines an implicit conversion from std::chrono::sys_days to weekday. 4) Constructs a weekday object representing the day of the week ld cor- responds to, as if by weekday(std::chrono::sys_days(ld.time_since_epoch())). Parameters wd - a weekday value sd - a system days object ld - a local days object Example // Run this code #include <chrono> #include <iomanip> #include <iostream> int main() { constexpr std::chrono::weekday friday{5}; // uses overload (2) static_assert(friday == std::chrono::Friday); for (int y{2020}; y <= 2023; ++y) { const std::chrono::year cur_year{y}; for (int cur_month{1}; cur_month != 13; ++cur_month) { const std::chrono::year_month_day ymd{cur_year/cur_month/13}; const std::chrono::weekday cur_week- day{std::chrono::sys_days(ymd)}; // (3) if (cur_weekday == friday) std::cout << ymd << " is " << friday << '\n'; } } } Output: 2020-03-13 is Fri 2020-11-13 is Fri 2021-08-13 is Fri 2022-05-13 is Fri 2023-01-13 is Fri 2023-10-13 is Fri http://cppreference.com 2024.06.10 std::chrono...day::weekday(3)
NAME | Synopsis | Parameters | Example | Output:
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