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‎reference/execution/execution.html‎

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<td><code><a href="execution/scope_association.html">execution::scope_association</a></code></td>
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<td>非同期スコープの関連付け (concept)</td>
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<td>C++26</td>
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<tr>
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<td><code><a href="execution/scope_token.html">execution::scope_token</a></code></td>
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<td>非同期スコープトークン (concept)</td>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3557r3.html" target="_blank">P3557R3 High-Quality Sender Diagnostics with Constexpr Exceptions</a></li>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3570r2.html" target="_blank">P3570R2 optional variants in sender/receiver</a></li>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3682r0.pdf" target="_blank">P3682R0 Remove <code>std::execution::split</code></a></li>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3815r1.html" target="_blank">P3815R1 Add <code>scope_association</code> concept to P3149</a></li>
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‎reference/execution/execution/associate.html‎

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‎reference/execution/execution/association-t.html‎

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2026年01月20日 07時36分33秒
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">class template</div><div class="header">&lt;execution&gt;</div><h1 class="exposition-only" itemprop="name"><span class="namespace" title="namespace std::execution">std::execution::</span><span class="token">association-t</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span><span class="cpp exposition-only" title="説明専用"></span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span> <span class="nc">Scope</span><span class="o">&gt;</span>
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<span class="k">struct</span> <span class="n">association</span><span class="o">-</span><span class="n">t</span><span class="p">;</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p><code>association-t</code>は、実行制御ライブラリの仕様定義で用いられる説明専用のクラステンプレートである。</p>
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<p><code>association-t</code>の特殊化は<code><a href="scope_association.html">scope_association</a></code>のモデルであり、<code>Scope*</code>型の説明専用メンバ<code>scope</code>を含む。クラス型<code>Scope</code>と<code>association-t&lt;Scope&gt;</code>型のオブジェクト<code>assoc</code>に対して、</p>
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<ul>
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<li><code>assoc.scope</code>は<a href="scope_association.html">関連スコープ</a>を指す。</li>
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<li><code>assoc.scope != nullptr</code>のとき、<code>assoc</code>は有効(engaged)である。</li>
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<li><code>assoc</code>が有効(engaged)ならば、<code>assoc.try_associate()</code>は<code>assoc.scope-&gt;try-associate()</code>と等価である。</li>
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<li><code>assoc</code>により所有される関連は、<code>assoc.scope-&gt;disassociate()</code>呼び出しによって解放される。</li>
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<h2>バージョン</h2>
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<h3>言語</h3>
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<ul>
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<li>C++26</li>
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</ul>
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<h2>関連項目</h2>
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<ul>
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<li><code><a href="scope_association.html">execution::scope_association</a></code></li>
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<li><code><a href="simple_counting_scope.html">execution::simple_counting_scope</a></code></li>
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<li><code><a href="simple_counting_scope.html">execution::counting_scope</a></code></li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3815r1.html" target="_blank">P3815R1 Add <code>scope_association</code> concept to P3149</a></li>
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<td><code>assoc-t</code></td>
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<td><code><a href="association-t.html">association-t</a>&lt;counting_scope&gt;</code>（説明専用）</td>
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<td>C++26</td>
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<td><code><a href="counting_scope/token.html">token</a></code></td>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3815r1.html" target="_blank">P3815R1 Add <code>scope_association</code> concept to P3149</a></li>
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;execution&#34;], &#34;namespace&#34;: [&#34;std::execution&#34;], &#34;class&#34;: [&#34;counting_scope&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp26&#34;], &#34;exposition-only&#34;: [&#34;&#34;]}, &#34;sources&#34;: [], &#34;page_id&#34;: [&#34;reference&#34;, &#34;execution&#34;, &#34;execution&#34;, &#34;counting_scope&#34;, &#34;disassociate&#34;]}">
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="kt">void</span> <span class="nf">disassociate</span><span class="p">()</span> <span class="k">noexcept</span><span class="p">;</span> <span class="c1">// exposition only</span>
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<div class="identifier-type">function</div><div class="header">&lt;execution&gt;</div><h1 class="exposition-only" itemprop="name"><span class="namespace" title="namespace std::execution">std::execution::</span><span class="class" title="class counting_scope">counting_scope::</span><span class="token">disassociate</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span><span class="cpp exposition-only" title="説明専用"></span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="kt">void</span> <span class="nf">disassociate</span><span class="p">()</span> <span class="k">noexcept</span><span class="p">;</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p>非同期スコープとの関連付けを解除する、説明専用のメンバ関数。
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非同期トークン型<code><a href="token.html">token</a></code>の<code><a href="token/disassociate.html">disassociate</a></code>メンバ動作を定義する。</p>
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<p>非同期スコープとの関連付けを解除する、説明専用のメンバ関数。</p>
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<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Preconditions。関数呼び出し時に満たされていると関数が想定する条件。満たさなければ未定義の動作。契約属性の`[[expects]]`に相当">事前条件</a></h2>
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<p>説明用のメンバ変数<code>count</code>は<code>0</code>より大きい。</p>
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<h2>効果</h2>

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