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‎reference/execution/execution.html‎

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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-04-13T05:48:15">
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2025年04月13日 05時48分15秒
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<td><code><a href="execution/receiver_of.html">execution::receiver_of</a></code></td>
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<td>完了シグネチャ集合を持つReceiver (concept)</td>
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<td>指定完了シグネチャ集合に適合するReceiver (concept)</td>
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<td>C++26</td>
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<td><code><span href="https://cpprefjp.github.io/reference/execution/execution/get_completion_signatures.md.nolink">execution::get_completion_signatures</span></code></td>
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<td>完了シグネチャ取得の問い合わせオブジェクト (customization point object)</td>
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<td>完了シグネチャ集合取得の問い合わせオブジェクト (customization point object)</td>
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<td>C++26</td>
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<td><code><span href="https://cpprefjp.github.io/reference/execution/execution/get_completion_signatures.md.nolink">execution::completion_signatures_of_t</span></code></td>
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<td>Senderから完了シグネチャを取得 (alias template)</td>
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<td><code><a href="execution/completion_signatures_of_t.html">execution::completion_signatures_of_t</a></code></td>
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<td>Senderから完了シグネチャ集合を取得 (alias template)</td>
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<td>C++26</td>
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<td><code><span href="https://cpprefjp.github.io/reference/execution/execution/completion_signatures.md.nolink">execution::completion_signatures</span></code></td>
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<td>完了シグネチャ (class template)</td>
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<td><code><a href="execution/completion_signatures.html">execution::completion_signatures</a></code></td>
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<td>完了シグネチャ集合を表現する型 (class template)</td>
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‎reference/execution/execution/completion_signatures.html‎

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<div class="identifier-type">class template</div><div class="header">&lt;execution&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std::execution">std::execution::</span><span class="token">completion_signatures</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span> <span class="n">std</span><span class="o">::</span><span class="n">execution</span> <span class="p">{</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="n">completion</span><span class="o">-</span><span class="n">signature</span><span class="p">...</span> <span class="n">Fns</span><span class="o">&gt;</span>
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<span class="k">struct</span> <span class="n">completion_signatures</span> <span class="p">{};</span>
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<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>completion_signatures</code>クラステンプレートは、完了シグネチャの集合をテンプレートパラメータとして表現する。</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。Constraints。関数であればオーバーロード解決に参加するための条件、それ以外であれば受け付ける型の条件">テンプレートパラメータ制約</a></h2>
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<p><code>Fns</code>の各要素<code>Fn</code>が、下記の説明専用コンセプト<code>completion-signature</code>を満たすこと。</p>
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<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">Fn</span><span class="o">&gt;</span>
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<span class="n">concept</span> <span class="n">completion</span><span class="o">-</span><span class="n">signature</span> <span class="o">=</span> <span class="n"><i>see below</i></span><span class="p">;</span>
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</code></pre></div>
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</p>
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<p>型<code>Fn</code>が下記いずれかを満たす関数型であるとき、<code>Fn</code>はコンセプト<code>completion-signature</code>を満たす。</p>
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<ul>
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<li><code>set_value_t(Vs...)</code>（<code>Vs</code>はオブジェクト型または参照型のパック）</li>
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<li><code>set_error_t(Err)</code>（<code>Err</code>はオブジェクト型または参照型）</li>
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<li><code>set_stopped_t()</code></li>
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</ul>
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<h2>例</h2>
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<p><div class="yata" id="2ebcb484ebb2468a938a2338e04f34c7f3b80e9f"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../../execution.html">&lt;execution&gt;</a></span><span class="cp"></span>
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<span class="k">namespace</span> <span class="n">ex</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">execution</span><span class="p">;</span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="c1">// 下記の完了操作をサポートする</span>
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<span class="c1">// 値完了 ex::set_value(int), ex::set_value(int, int)</span>
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<span class="c1">// エラー完了 ex::set_error(<a href="../../exception/exception_ptr.html">std::exception_ptr</a>)</span>
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<span class="c1">// 停止完了 ex::set_stopped()</span>
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<span class="k">using</span> <span class="n">Sigs</span> <span class="o">=</span> <span class="n"><span style="color:#ff0000">ex::completion_signatures</span></span><span class="o">&lt;</span>
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<span class="n">ex</span><span class="o">::</span><span class="n">set_value_t</span><span class="p">(</span><span class="kt">int</span><span class="p">),</span>
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<span class="n">ex</span><span class="o">::</span><span class="n">set_value_t</span><span class="p">(</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="p">),</span>
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<span class="n">ex</span><span class="o">::</span><span class="n">set_error_t</span><span class="p">(</span><span class="n"><a href="../../exception/exception_ptr.html">std::exception_ptr</a></span><span class="p">),</span>
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<span class="n">ex</span><span class="o">::</span><span class="n">set_stopped_t</span><span class="p">()</span>
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<span class="o">&gt;</span><span class="p">;</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>出力</h3>
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<p><pre><code></code></pre></p>
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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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<h3>処理系</h3>
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<ul>
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<li><a href="../../../implementation.html#clang">Clang</a>: ??</li>
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<li><a href="../../../implementation.html#gcc">GCC</a>: ??</li>
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<li><a href="../../../implementation.html#icc">ICC</a>: ??</li>
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<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: ??</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="receiver.html">execution::receiver</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://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2300r10.html" target="_blank">P2300R10 <code>std::execution</code></a></li>
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