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std::chrono::month_day::ok(3) C++ Standard Libarystd::chrono::month_day::ok(3) NAME std::chrono::month_day::ok - std::chrono::month_day::ok Synopsis constexpr bool ok() const noexcept; (since C++20) Determines whether this month_day stores a valid month-day combina- tion. The combination is valid if month() represents a valid month (month().ok() == true), unsigned{day()} >= 1, and unsigned{day()} <= D, where D is the num- ber of days in the month represented by month(). The number of days in February is con- sidered to be 29. Return value true if the month and day combination is valid, otherwise false. Example // Run this code #include <iostream> #include <chrono> int main() { std::cout << std::boolalpha; constexpr auto md1 {std::chrono::July/15}; std::cout << (md1.ok()) << ' '; constexpr std::chrono::month_day md2 {std::chrono::month(14), std::chrono::day(42)}; std::cout << (md2.ok()) << ' '; constexpr auto md3 {std::chrono::February/29}; std::cout << (md3.ok()) << '\n'; } Output: true false true http://cppreference.com 2022.07.31 std::chrono::month_day::ok(3)
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