- chrono[meta header]
- std::chrono[meta namespace]
- year_month_weekday[meta class]
- function[meta id-type]
- cpp20[meta cpp]
constexpr unsigned int index() const noexcept; // (1) C++20何回目の曜日かを取得する。
以下と等価:
return weekday_indexed().index();- weekday_indexed()[link weekday_indexed.md]
- index()[link /reference/chrono/weekday_indexed/index.md]
#include <cassert>
#include <chrono>
namespace chrono = std::chrono;
using namespace std::chrono_literals;
int main()
{
chrono::year_month_weekday date = 2020y/3/chrono::Sunday[2];
unsigned int i = date.index();
assert(i == 2);
}- date.index()[color ff0000]
- 2020y[link /reference/chrono/year/op_y.md]
- chrono::Sunday[link /reference/chrono/weekday_constants.md]
- C++20
- Clang: 8.0
- GCC: 11.1
- Visual C++: (2019 Update 3時点で実装なし)