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‎reference/execution/execution/sender.html‎

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<p class="text-right"><small>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">Sndr</span><span class="o">&gt;</span>
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<span class="n">concept</span> <span class="n">enable</span><span class="o">-</span><span class="n">sender</span> <span class="o">=</span>
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<span class="n">is</span><span class="o">-</span><span class="n">sender</span><span class="o">&lt;</span><span class="n">Sndr</span><span class="o">&gt;</span> <span class="o">||</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/execution/execution/is-awaitable.md.nolink">is-awaitable</span></span><span class="o">&lt;</span><span class="n">Sndr</span><span class="p">,</span> <span class="n">env</span><span class="o">-</span><span class="n">promise</span><span class="o">&lt;</span><span class="n"><span href="https://cpprefjp.github.io/reference/execution/execution/env.md.nolink">env&lt;&gt;</span></span><span class="o">&gt;&gt;</span><span class="p">;</span>
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<span class="n"><a href="../is-awaitable.html">is-awaitable</a></span><span class="o">&lt;</span><span class="n">Sndr</span><span class="p">,</span> <span class="n">env</span><span class="o">-</span><span class="n">promise</span><span class="o">&lt;</span><span class="n"><span href="https://cpprefjp.github.io/reference/execution/execution/env.md.nolink">env&lt;&gt;</span></span><span class="o">&gt;&gt;</span><span class="p">;</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">Env</span><span class="o">&gt;</span>
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<span class="k">struct</span> <span class="n">env</span><span class="o">-</span><span class="nl">promise</span> <span class="p">:</span> <span class="n">with</span><span class="o">-</span><span class="n">await</span><span class="o">-</span><span class="n">transform</span><span class="o">&lt;</span><span class="n">env</span><span class="o">-</span><span class="n">promise</span><span class="o">&lt;</span><span class="n">Env</span><span class="o">&gt;&gt;</span> <span class="p">{</span>

‎reference/execution/is-awaitable.html‎

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<div class="identifier-type">concept</div><div class="header">&lt;execution&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">is-awaitable</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">C</span><span class="p">,</span> <span class="k">class</span> <span class="nc">Promise</span><span class="o">&gt;</span>
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<span class="n">concept</span> <span class="n">is</span><span class="o">-</span><span class="n">awaitable</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>is-awaitable</code>は、Promise型をもつ<a href="../../lang/cpp20/coroutines.html">コルーチンのco_await演算子</a>オペランドにおいて<code>C</code>型オブジェクトが妥当であることを表す説明専用コンセプトである。</p>
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<h2>要件</h2>
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<p>説明用の式<code>GET-AWAITER(c, p)</code>を、Promise型<code>p</code>をもつコルーチン内の<code>co_await</code>演算子オペランドに適用される一連変換後の左辺値とする。</p>
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<ul>
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<li>（有効ならば）Promise型の<code>await_transform</code>メンバ関数を適用</li>
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<li>（有効ならば）<code>co_await</code>演算子<a class="cpprefjp-defined-word" data-desc="同名の関数を異なる引数・テンプレート・制約などで複数定義すること。または同名の関数の集合">オーバーロード</a>を適用</li>
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</ul>
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<p>また、説明用のコンセプト<code>await-suspend-result</code>, <code>is-awaiter</code>を以下のように定義する。</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">T</span><span class="o">&gt;</span>
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<span class="n">concept</span> <span class="n">await</span><span class="o">-</span><span class="n">suspend</span><span class="o">-</span><span class="n">result</span> <span class="o">=</span> <span class="cm">/*see below*/</span><span class="p">;</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">A</span><span class="p">,</span> <span class="k">class</span> <span class="nc">Promise</span><span class="o">&gt;</span>
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<span class="n">concept</span> <span class="n">is</span><span class="o">-</span><span class="n">awaiter</span> <span class="o">=</span>
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<span class="n">requires</span> <span class="p">(</span><span class="n">A</span><span class="o">&amp;</span> <span class="n">a</span><span class="p">,</span> <span class="n"><a href="../coroutine/coroutine_handle.html">coroutine_handle</a></span><span class="o">&lt;</span><span class="n">Promise</span><span class="o">&gt;</span> <span class="n">h</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">a</span><span class="p">.</span><span class="n">await_ready</span><span class="p">()</span> <span class="o">?</span> <span class="mi">1</span> <span class="o">:</span> <span class="mi">0</span><span class="p">;</span>
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<span class="p">{</span> <span class="n">a</span><span class="p">.</span><span class="n">await_suspend</span><span class="p">(</span><span class="n">h</span><span class="p">)</span> <span class="p">}</span> <span class="o">-&gt;</span> <span class="n">await</span><span class="o">-</span><span class="n">suspend</span><span class="o">-</span><span class="n">result</span><span class="p">;</span>
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<span class="n">a</span><span class="p">.</span><span class="n">await_resume</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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<p>下記いずれかのうち1つが<code>true</code>のとき、<code>await-suspend-result&lt;T&gt;</code>は<code>true</code>となる。</p>
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<ul>
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<li><code>T</code>が<code>void</code>、もしくは</li>
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<li><code>T</code>が<code>bool</code>、もしくは</li>
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<li><code>T</code>が<code><a href="../coroutine/coroutine_handle.html">coroutine_handle</a></code>の特殊化</li>
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</ul>
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<p><code>is-awaitable</code>コンセプトは、以下のように定義される。</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">C</span><span class="p">,</span> <span class="k">class</span> <span class="nc">Promise</span><span class="o">&gt;</span>
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<span class="n">concept</span> <span class="n">is</span><span class="o">-</span><span class="n">awaitable</span> <span class="o">=</span>
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<span class="n">requires</span> <span class="p">(</span><span class="n">C</span> <span class="p">(</span><span class="o">*</span><span class="n">fc</span><span class="p">)()</span> <span class="k">noexcept</span><span class="p">,</span> <span class="n">Promise</span><span class="o">&amp;</span> <span class="n">p</span><span class="p">)</span> <span class="p">{</span>
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<span class="p">{</span> <span class="n"><i>GET-AWAITER</i></span><span class="p">(</span><span class="n">fc</span><span class="p">(),</span> <span class="n">p</span><span class="p">)</span> <span class="p">}</span> <span class="o">-&gt;</span> <span class="n">is</span><span class="o">-</span><span class="n">awaiter</span><span class="o">&lt;</span><span class="n">Promise</span><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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</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><a href="../../lang/cpp20/coroutines.html">コルーチン</a></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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