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‎reference/execution/execution/task.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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2026年01月13日 11時50分45秒
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<li>第2テンプレートパラメータ<code>Environment</code>は、<code>task</code>の動作カスタマイズに用いられる。</li>
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</ul>
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<h2>クラス仕様</h2>
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<p><code>T</code>が<code>void</code>、参照型、cv修飾された非配列オブジェクト型であり、かつ<code>E</code>がクラス型であるとき、<code>task&lt;T, E&gt;</code>は<code><a href="sender.html">sender</a></code>のモデルである。そうでなければ、<code>task&lt;T, E&gt;</code>の定義をインスタンス化するプログラムは<a class="cpprefjp-defined-word" data-desc="プログラムが適格でないこと。コンパイルエラーなどになる" href="../../../implementation-compliance.html#dfn-ill-formed">不適格</a>となる。</p>
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<p><code>task</code>クラステンプレートは、下記の説明専用メンバ変数を持つ。</p>
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<ul>
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<li><code>handle</code> : <code><a href="../../coroutine/coroutine_handle.html">coroutine_handle</a>&lt;<a href="task/promise_type.html">promise_type</a>&gt;</code></li>
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</ul>
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<p><code>T</code>が<code>void</code>、参照型、cv修飾された非配列オブジェクト型のいずれかであり、かつ<code>E</code>がクラス型であるとき、<code>task&lt;T, E&gt;</code>は<code><a href="sender.html">sender</a></code>のモデルである。そうでなければ、<code>task&lt;T, E&gt;</code>の定義をインスタンス化するプログラムは<a class="cpprefjp-defined-word" data-desc="プログラムが適格でないこと。コンパイルエラーなどになる" href="../../../implementation-compliance.html#dfn-ill-formed">不適格</a>となる。</p>
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<p><code>task</code>テンプレート特殊化のネストした型は、<code>Environment</code>パラメータに基づいて決定される :</p>
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<ul>
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<li><code>allocator_type</code> : <code>Environment::allocator_type</code>が有効な型ならばその型、そうでなければ<code><a href="../../memory/allocator.html">allocator</a>&lt;byte&gt;</code></li>
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<td>C++26</td>
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</tr>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/execution/execution/task/promise_type.md.nolink">promise_type</span></code></td>
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<td><code><a href="task/promise_type.html">promise_type</a></code></td>
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<td>タスクコルーチンの<a href="../../../lang/cpp20/coroutines.html">Promise型</a></td>
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<td>C++26</td>
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</tr>
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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><span href="https://cpprefjp.github.io/reference/execution/execution/with_error.md.nolink">execution::with_error</span></code></li>
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<li><code><span href="https://cpprefjp.github.io/reference/execution/execution/change_coroutine_scheduler.md.nolink">execution::change_coroutine_scheduler</span></code></li>
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<li><code><a href="task_scheduler.html">execution::task_scheduler</a></code></li>
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</ul>
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<h2>参照</h2>

‎reference/execution/execution/task/promise_type.html‎

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‎reference/execution/execution/task/promise_type/await_transform.html‎

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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">function template</div><div class="header">&lt;execution&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std::execution">std::execution::</span><span class="class" title="class task::promise_type">task::promise_type::</span><span class="token">await_transform</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span></h1>
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<h1 itemprop="name"><span class="namespace" title="namespace std::execution">std::execution::</span><span class="class" title="class task::promise_type">task::promise_type::</span><span class="token">概要</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">template</span><span class="o">&lt;</span><span class="n"><a href="../../sender.html">sender</a></span> <span class="n">Sender</span><span class="o">&gt;</span>
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<span class="k">auto</span> <span class="n">await_transform</span><span class="p">(</span><span class="n">Sender</span><span class="o">&amp;&amp;</span> <span class="n">sndr</span><span class="p">);</span> <span class="c1">// (1)</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">Sch</span><span class="o">&gt;</span>
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<span class="k">auto</span> <span class="n">await_transform</span><span class="p">(</span><span class="n"><span href="https://cpprefjp.github.io/reference/execution/execution/change_coroutine_scheduler.md.nolink">change_coroutine_scheduler</span></span><span class="o">&lt;</span><span class="n">Sch</span><span class="o">&gt;</span> <span class="n">sch</span><span class="p">);</span> <span class="c1">// (2)</span>
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</code></pre></div>
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</p>
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<p>タスクコルーチンにおける<a href="../../../../../lang/cpp20/coroutines.html">co_await式</a>の動作を制御する。
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プログラマが本関数を直接利用することは想定されていない。</p>
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<h2>効果</h2>
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<ul>
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<li>(1) :<ul>
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<li><code><a href="../../../../concepts/same_as.html">same_as</a>&lt;<a href="../../inline_scheduler.html">inline_scheduler</a>,<a href="../../task.html">scheduler_type</a>&gt; == true</code>ならば、<code><a href="../../as_awaitable.html">as_awaitable</a>(std::forward&lt;Sender&gt;(sndr), *this)</code>を返す。</li>
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<li>そうでなければ、<code><a href="../../as_awaitable.html">as_awaitable</a>(<span href="https://cpprefjp.github.io/reference/execution/execution/affine_on.md.nolink">affine_on</span>(std::forward&lt;Sender&gt;(sndr), SCHED(*this)), *this)</code>を返す。</li>
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</ul>
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<li>
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<p>(2) : 以下と等価</p>
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<p><div class="codehilite"><pre><span></span><code><span class="k">return</span> <span class="nf">await_transform</span><span class="p">(</span><span class="n"><a href="../../just.html">just</a></span><span class="p">(</span><span class="n"><a href="../../../../utility/exchange.html">exchange</a></span><span class="p">(</span><span class="n">SCHED</span><span class="p">(</span><span class="o">*</span><span class="k">this</span><span class="p">),</span> <span class="n"><a href="../../task.html">scheduler_type</a></span><span class="p">(</span><span class="n">sch</span><span class="p">.</span><span class="n"><span href="https://cpprefjp.github.io/reference/execution/execution/change_coroutine_scheduler.md.nolink">scheduler</span></span><span class="p">))),</span> <span class="o">*</span><span class="k">this</span><span class="p">);</span>
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</code></pre></div>
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</p>
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</li>
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</ul>
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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="../../as_awaitable.html">execution::as_awaitable</a></code></li>
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<li><code><span href="https://cpprefjp.github.io/reference/execution/execution/affine_on.md.nolink">execution::affine_on</span></code></li>
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<li><code><a href="../../inline_scheduler.html">execution::inline_scheduler</a></code></li>
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<li><code><span href="https://cpprefjp.github.io/reference/execution/execution/change_coroutine_scheduler.md.nolink">execution::change_coroutine_scheduler</span></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/2025/p3552r3.html" target="_blank">P3552R3 Add a Coroutine Task Type</a></li>
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