# std::chrono::weekday_indexed::weekday_indexed

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< cpp‎ | chrono‎ | weekday indexed

weekday_indexed() = default; | (1) | (since C++20)
constexpr weekday_indexed( const std::chrono::weekday& wd, unsigned index ) noexcept; | (2) | (since C++20)

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

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

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