std::chrono::weekday::operator[]

Since C++20
  1. Constructs a weekday_indexed from *this and index. The result represents the index-th weekday in some yet-to-be-specified month. If index is not in the range [0,7] or if !ok() the values (an underlying weekday and an index) held in the result are unspecified.

# Declarations

constexpr std::chrono::weekday_indexed
operator[]( unsigned index ) const noexcept;

(since C++20)

constexpr std::chrono::weekday_last
operator[]( std::chrono::last_spec ) const noexcept;

(since C++20)

# Example

#include <chrono>
#include <iostream>
using namespace std::chrono;
 
int main()
{
    constexpr auto second_tuesday_in_October_2019 =
        year_month_day{Tuesday[2] / October / 2019y};
 
    constexpr auto last_tuesday_in_October_2019 =
        year_month_day{Tuesday[last] / October / 2019y};
 
    std::cout << second_tuesday_in_October_2019 << '\n'
              << last_tuesday_in_October_2019 << '\n'; 
}