std::chrono::year_month_weekday::ok

constexpr bool ok() const noexcept;

Checks if this year_month_weekday object represents a valid date.

Return value

true if this year_month_weekday object represents a valid date, that is, year().ok() && month().ok() && weekday_indexed().ok() is true and there are at least index() weekday()s in the specified year and month. Otherwise false.

Example

#include <cassert>
#include <chrono>
 
int main()
{
    auto ymwdi{std::chrono::Wednesday[1]/1/2021};
    assert(ymwdi.ok());
    ymwdi = std::chrono::year(2021)/std::chrono::month(1)/std::chrono::Wednesday[42];
    assert(!ymwdi.ok());
}