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

constexpr std::chrono::weekday_indexed operator[](unsigned index) const noexcept;	(1)	(since C++20)
constexpr std::chrono::weekday_last operator[](std::chrono::last_spec) const noexcept;	(2)	(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 [1, 5] or if !ok() the values held in the result is unspecified.

2) Constructs a weekday_last from *this. The result represents the last weekday in some yet-to-be-specified month.

Return value

1) std::chrono::weekday_indexed(*this, index)

2) std::chrono::weekday_last(*this)

Example

#include <chrono>
#include <iostream>
using namespace std::chrono;
 
int main()
{
  // second tuesday in October 2019
  std::cout << year_month_day{ Tuesday[2] / October / 2019y } << '\n'
  // last tuesday in October 2019
            << year_month_day{ Tuesday[last] / October / 2019y } << '\n';
}

Output:

2019-10-08
2019-10-29

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