W3cubDocs

/C++

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 [0, 7] or if !ok() the values (an underlying weekday and an index) held in the result are 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()
{
    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'; 
}

Possible output:

2019-10-08
2019-10-29

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/chrono/weekday/operator_at