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<div class="identifier-type">class</div><div class="header"><chrono></div><h1 itemprop="name"><span class="namespace" title="namespace std::chrono">std::chrono::</span><span class="token">weekday_last</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">chrono</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">weekday_last</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>weekday_last</code>は、月内での指定した最終曜日を表すクラスである。</p>
<p>このクラスは等値比較ができ、<a href="../concepts/equality_comparable.html">EqualityComparable</a>の要件を満たす。しかし大小比較はできず、LessThanComparable要件は満たさない。</p>
<p>このクラスは、<a href="../type_traits/is_trivially_copyable.html">トリビアルコピー可能</a>で、かつ<a href="../type_traits/is_standard_layout.html">スタンダードレイアウト型</a>である。</p>
<h2>メンバ関数</h2>
<h3>構築／コピー／破棄</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="weekday_last/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td>C++20</td>
</tr>
<tr>
<td><code>weekday_last& operator=(const weekday_last&) = default;</code><br /> <code>weekday_last& operator=(weekday_last&&) = default;</code></td>
<td>代入演算子</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h3>観測</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="weekday_last/weekday.html">weekday</a></code></td>
<td>曜日を取得する</td>
<td>C++20</td>
</tr>
<tr>
<td><code><a href="weekday_last/ok.html">ok</a></code></td>
<td>値が範囲に収まっているか判定する</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h2>非メンバ関数</h2>
<h3>比較演算</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="weekday_last/op_equal.html">operator==</a></code></td>
<td>等値比較を行う</td>
<td>C++20</td>
</tr>
<tr>
<td><code>bool operator!=(const weekday_last&, const weekday_last&) noexcept;</code></td>
<td>非等値比較を行う (<code>==</code>により使用可能)</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h3>入出力</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="weekday_last/op_ostream.html">operator<<</a></code></td>
<td>出力ストリームに出力する</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h2>文字列フォーマットサポート</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="weekday_last/formatter.html">formatter</a></code></td>
<td><code><a href="../format/formatter.html">std::formatter</a></code>クラスの特殊化</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h2>ハッシュサポート</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>template <class T> struct hash;</code></td>
<td><code>hash</code>クラスの先行宣言</td>
<td>C++26</td>
</tr>
<tr>
<td><code>template<> struct hash<chrono::weekday_last>;</code></td>
<td><code>hash</code>クラスの<code>weekday_last</code>に対する特殊化</td>
<td>C++26</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="be52f825de0e10efa33d7d58963bb24723603daf"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../cassert.html"><cassert></a></span>
<span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../chrono.html"><chrono></a></span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">chrono</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">chrono</span><span class="p">;</span>
<span class="k">using</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">chrono_literals</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="c1">// 未規定の年月の、最後の日曜日</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">wl1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="weekday_constants.html">chrono::Sunday</a></span><span class="p">[</span><span class="n"><a href="last_spec.html">chrono::last</a></span><span class="p">];</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">chrono::weekday_last</span></span><span class="w"> </span><span class="n">wl2</span><span class="p">{</span><span class="n"><a href="weekday_constants.html">chrono::Sunday</a></span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="weekday_last/weekday.html">wl1.weekday()</a></span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n"><a href="weekday_constants.html">chrono::Sunday</a></span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n">wl1</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">wl2</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 2020年4月の最後の日曜日を取得する</span>
<span class="w"> </span><span class="n"><a href="year_month_weekday_last.html">chrono::year_month_weekday_last</a></span><span class="w"> </span><span class="n">ymwl</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="year/op_y.html">2020y</a></span><span class="o">/</span><span class="mi">4</span><span class="o">/</span><span class="n"><a href="weekday_constants.html">chrono::Sunday</a></span><span class="p">[</span><span class="n"><a href="last_spec.html">chrono::last</a></span><span class="p">];</span>
<span class="w"> </span><span class="n"><a href="sys_time.html">chrono::sys_days</a></span><span class="w"> </span><span class="n">sd</span><span class="p">{</span><span class="n">ymwl</span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="year_month_day.html">chrono::year_month_day</a></span><span class="w"> </span><span class="n">date</span><span class="p">{</span><span class="n">sd</span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">date</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>2020-04-26
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++20</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 8.0 (入出力ストリームなし) <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 10.1 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2019 Update 3 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2592r3.html" target="_blank">P2592R3 Hashing support for <code>std::chrono</code> value classes</a><ul>
<li>C++26でハッシュサポートが追加された</li>
</ul>
</li>
</ul></div>
</div>
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