std::chrono::weekday_indexed::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
#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 from this weekday (public member function of std::chrono::weekday) |
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