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‎reference/execution/execution.html

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最終更新日時(UTC):
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<td>C++26</td>
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<td><code><span href="https://cpprefjp.github.io/reference/execution/execution/on.md.nolink">execution::on</span></code></td>
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<td>指定Scheduler上で実行する (customization point object)</td>
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<td><code><a href="execution/on.html">execution::on</a></code></td>
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<td>指定Senderのみ別Scheduler上で実行する (customization point object)</td>
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<td>C++26</td>
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‎reference/execution/execution/query-with-default.html

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2025年05月12日 15時44分48秒
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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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="token">query-with-default</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="k">class</span> <span class="nc">Tag</span><span class="p">,</span> <span class="k">class</span> <span class="nc">Env</span><span class="p">,</span> <span class="k">class</span> <span class="nc">Default</span><span class="o">&gt;</span>
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<span class="k">constexpr</span> <span class="n"><a href="../../../lang/cpp14/decltype_auto.html">decltype(auto)</a></span> <span class="n">query</span><span class="o">-</span><span class="n">with</span><span class="o">-</span><span class="k">default</span><span class="p">(</span>
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<span class="n">Tag</span><span class="p">,</span> <span class="k">const</span> <span class="n">Env</span><span class="o">&amp;</span> <span class="n">env</span><span class="p">,</span> <span class="n">Default</span><span class="o">&amp;&amp;</span> <span class="n">value</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">(</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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<h2>概要</h2>
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<p><code>query-with-default</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関数テンプレートである。</p>
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<p>説明用の式<code>e</code>を、<a class="cpprefjp-defined-word" data-desc="プログラムが文法規則・診断対象の意味規則・単一定義規則を満たすこと" href="../../../implementation-compliance.html#dfn-well-formed">適格</a>であるならば<code>Tag()(env)</code>とする。そうでなければ、<code>staitc_cast&lt;Default&gt;(<a href="../../utility/forward.html">std::forward</a>&lt;Default&gt;(value))</code>とする。</p>
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<h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></h2>
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<p><code>e</code>を返す。</p>
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<h2>備考</h2>
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<p>noexcept節の式は<code>noexcept(e)</code>となる。</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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<h2>関連項目</h2>
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<ul>
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<li><code><a href="on.html">execution::on</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/2023/p2999r3.html" target="_blank">P2999R3 Sender Algorithm Customization</a></li>
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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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‎reference/execution/execution/starts_on.html

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<p class="text-right"><small>
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2025年05月10日 14時27分12秒
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<a href="default_domain.html">デフォルト実行ドメイン</a>では<code>starts_on.transform_sender(out_sndr, env)</code>が呼ばれ、前述仕様通りのSenderへと変換される。</p>
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<p>説明用の式<code>out_sndr</code>を<code>starts_on(sch, sndr)</code>の<a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a><a href="sender.html">Sender</a>とし、型<code>OutSndr</code>を<code>decltype((out_sndr))</code>とする。式<code>out_rcvr</code>を<code><a href="sender_in.html">sender_in</a>&lt;OutSndr, Env&gt; == true</code>となる<a href="../queryable.html">環境</a><code>Env</code>に関連付けられた<a href="receiver.html">Receiver</a>とする。<code>out_sndr</code>と<code>out_rcvr</code>との<a href="connect.html">接続(connect)</a>結果<a href="operation_state.html">Operation State</a>への左辺値参照を<code>op</code>としたとき、</p>
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<li>呼び出し<code><a href="start.html">start</a>(op)</code>は、<a href="scheduler.html">Scheduler</a><code>sch</code>に関連づけられた実行リソースに属する実行エージェント上で入力<a href="sender.html">Sender</a><code>sndr</code>を開始すべき。</li>
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<li>呼び出し<code><a href="start.html">start</a>(op)</code>は、<a href="scheduler.html">Scheduler</a><code>sch</code>に関連付けられた実行リソースに属する実行エージェント上で入力<a href="sender.html">Sender</a><code>sndr</code>を開始すべき。</li>
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<li><code>sch</code>上でのスケジューリングが失敗した場合、<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>の実行エージェント上で<code>out_rcvr</code>の<a href="set_error.html">エラー完了</a>が行われるべき。</li>
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<h2>例</h2>
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<ul>
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<li><code><a href="schedule.html">execution::schedule</a></code></li>
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<li><code><span href="https://cpprefjp.github.io/reference/execution/execution/continues_on.md.nolink">execution::continues_on</span></code></li>
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<li><code><span href="https://cpprefjp.github.io/reference/execution/execution/on.md.nolink">execution::on</span></code></li>
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<li><code><a href="on.html">execution::on</a></code></li>
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<h2>参照</h2>
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<ul>

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