weekday.md

weekday

• chrono[meta header]
• std::chrono[meta namespace]
• year_month_weekday_last[meta class]
• function[meta id-type]
• cpp20[meta cpp]

constexpr chrono::weekday weekday() const noexcept; // (1) C++20

• chrono::weekday[link /reference/chrono/weekday.md]

概要

曜日要素を取得する。

戻り値

以下と等価：

return weekday_last().weekday();

• weekday_last()[link weekday_last.md]
• weekday()[link /reference/chrono/weekday_last/weekday.md]

例

#include <cassert>
#include <chrono>

namespace chrono = std::chrono;
using namespace std::chrono_literals;

int main()
{
  chrono::year_month_weekday_last date = 2020y/3/chrono::Sunday[chrono::last];
  chrono::weekday wd = date.weekday();
  assert(wd == chrono::Sunday);
}

• date.weekday()[color ff0000]
• chrono::weekday[link /reference/chrono/weekday.md]
• 2020y[link /reference/chrono/year/op_y.md]
• chrono::Sunday[link /reference/chrono/weekday_constants.md]
• chrono::last[link /reference/chrono/last_spec.md]

出力

バージョン

言語

• C++20

処理系

• Clang: 8.0
• GCC: 11.1
• Visual C++: (2019 Update 3時点で実装なし)