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<div class="identifier-type">class</div><div class="header"><thread></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class thread">thread::</span><span class="token">id</span><span class="cpp cpp11" title="C++11で追加">(C++11)</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="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">public</span><span class="o">:</span>
<span class="w"> </span><span class="n">id</span><span class="p">()</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="w"> </span><span class="p">};</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="k">operator</span><span class="o">==</span><span class="p">(</span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="k">operator</span><span class="o"><</span><span class="p">(</span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="k">operator</span><span class="o"><=</span><span class="p">(</span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="k">operator</span><span class="o">></span><span class="p">(</span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="k">operator</span><span class="o">>=</span><span class="p">(</span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">CharT</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Traits</span><span class="o">></span>
<span class="w"> </span><span class="n"><a href="../../ostream/basic_ostream.html">std::basic_ostream</a></span><span class="o"><</span><span class="n">CharT</span><span class="p">,</span><span class="w"> </span><span class="n">Traits</span><span class="o">>&</span><span class="w"> </span><span class="k">operator</span><span class="o"><<</span><span class="p">(</span><span class="n"><a href="../../ostream/basic_ostream.html">std::basic_ostream</a></span><span class="o"><</span><span class="n">CharT</span><span class="p">,</span><span class="w"> </span><span class="n">Traits</span><span class="o">>&</span><span class="w"> </span><span class="n">out</span><span class="p">,</span><span class="w"> </span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="w"> </span><span class="n">id</span><span class="p">);</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc"><a href="../../functional/hash.html">hash</a></span><span class="p">;</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><></span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc"><a href="../../functional/hash.html">hash</a></span><span class="o"><</span><span class="kr">thread</span><span class="o">::</span><span class="n">id</span><span class="o">></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>スレッド識別子。trivially copyable class。</p>
<p>実行のスレッドに対して一意な<code>thread::id</code>が対応づけられる。<a class="cpprefjp-defined-word" data-desc="デフォルト初期化。`T x;`構文での初期化。トリビアルにデフォルト構築可能な型の場合は初期化されず（オブジェクトのlifetimeは開始される）、そうではないクラス型はデフォルトコンストラクタで初期化する。配列型の場合は各要素が再帰的にデフォルト初期化される">デフォルト構築</a>された<code>thread::id</code>はいかなるスレッドとも対応付けられない（ポインタ型における<code>nullptr</code>のようなもの）。</p>
<p>終了したスレッドを表す識別子の値は、再利用される可能性がある。</p>
<h2>メンバ関数</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>id() noexcept</code></td>
<td>デフォルトコンストラクタ。いかなるスレッドも指さない識別子を生成する。</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>比較演算子</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>operator==</code></td>
<td>等値比較</td>
<td>C++11</td>
</tr>
<tr>
<td><code>operator!=</code></td>
<td>非等値比較 (C++20から<code>operator==</code>により使用可能)</td>
<td>C++11</td>
</tr>
<tr>
<td><code>operator<</code></td>
<td>左辺が右辺より小さいかの判定を行う (C++20から<code>operator<=></code>により使用可能)</td>
<td>C++11</td>
</tr>
<tr>
<td><code>operator<=</code></td>
<td>左辺が右辺以下かの判定を行う (C++20から<code>operator<=></code>により使用可能)</td>
<td>C++11</td>
</tr>
<tr>
<td><code>operator></code></td>
<td>左辺が右辺より大きいかの判定を行う (C++20から<code>operator<=></code>により使用可能)</td>
<td>C++11</td>
</tr>
<tr>
<td><code>operator>=</code></td>
<td>左辺が右辺以上かの判定を行う (C++20から<code>operator<=></code>により使用可能)</td>
<td>C++11</td>
</tr>
<tr>
<td><code>strong_ordering operator<=>(thread::id x, thread::id y) noexcept;</code></td>
<td>三方比較</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h3>ストリーム出力</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>operator<<</code></td>
<td><code>thread::id</code>のストリーム出力。 フォーマットは<a class="cpprefjp-defined-word" data-desc="未規定の動作。事前の断りなく処理系によって異なる動作をする" href="../../../implementation-compliance.html#dfn-unspecified-behavior">未規定</a>だが、他の識別子と異なることがわかる表現となる。</td>
<td>C++11</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>hash</code></td>
<td><code>thread::id</code>での特殊化 (class template)</td>
<td>C++11</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="id/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++23</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="2f3751f1d4afb61892da5841c75deab17681834a"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../../thread.html"><thread></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::thread::id</span></span><span class="w"> </span><span class="n">main_tid</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../this_thread/get_id.html">std::this_thread::get_id()</a></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="s">"main="</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">main_tid</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="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力例</h3>
<p><pre><code>main=824a30
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++11</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../../implementation.html#clang">Clang</a>:</li>
<li><a href="../../../implementation.html#gcc">GCC</a>:</li>
<li><a href="../../../implementation.html#icc">ICC</a>:</li>
<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: 2012 <span aria-label="検証済" role="img" title="検証済">✅</span>, 2013 <span aria-label="検証済" role="img" title="検証済">✅</span>, 2015 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#783" target="_blank">LWG Issue 783. <code>thread::id</code> reuse</a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1614r2.html" target="_blank">P1614R2 The Mothership has Landed</a><ul>
<li>C++20での三方比較演算子の追加と、関連する演算子の自動導出</li>
</ul>
</li>
</ul></div>
</div>
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