std::chrono::weekday_indexed::weekday_indexed(3)

NAME
std::chrono::weekday_indexed::weekday_indexed - std::chrono::weekday_indexed::weekday_indexed

Synopsis
   weekday_indexed() = default; (1) (since C++20)
   constexpr weekday_indexed(const std::chrono::weekday& wd, unsigned (2) (since C++20)
   index) noexcept;
   Constructs a weekday_indexed.
   1) Default constructor leaves both the std::chrono::weekday and the index value
   uninitialized.
   2) Constructs a weekday_indexed storing the weekday wd and the index index. The
   values held are unspecified if !wd.ok() || index > 7.

Notes
   A more convenient way to construct a weekday_indexed is with weekday's operator[],
   i.e., wd[index].

Example
// Run this code
 #include <chrono>
 #include <iostream>
 using namespace std::chrono;
 int main() {
   constexpr auto third_friday = weekday_indexed(Friday, 3); // uses constructor (2)
   static_assert(third_friday == Friday[3]);
   weekday_indexed wdi = Tuesday[2]; // represents the 2nd Tuesday
   std::cout << year_month_day{ wdi / October / 2019y } << '\n';
 }

Possible output:
 2019-10-08

See also
              convenience syntax for constructing a weekday_indexed or weekday_last
   operator[] from this weekday
              (public member function of std::chrono::weekday)