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<feed xmlns =" http://www.w3.org/2005/Atom" >
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<title >cpprefjp - C++日本語リファレンス</title >
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<link href =" https://cpprefjp.github.io" />
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- <updated >2025-04-15T04:14:23.014019 </updated >
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- <id >130afdee-487f-434e-afc3-a0330108c301 </id >
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+ <updated >2025-04-15T05:16:09.620540 </updated >
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+ <id >52b184a8-4538-463b-9acc-9c3e2f6e412e </id >
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<entry >
@@ -1475,117 +1475,4 @@ index ed10d259b..86ed8088d 100644
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</author >
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</entry >
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- <entry >
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- <title >sender -- execution: is-awaitable (#1384)</title >
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- <link href =" https://cpprefjp.github.io/reference/execution/execution/sender.html" />
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- <id >c22f5566bef585080db7bde797aa85e25ba1e413:reference/execution/execution/sender.md</id >
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- <updated >2025-04-14T22:11:13+09:00</updated >
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-
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- <summary type =" html" >< pre>< code> diff --git a/reference/execution/execution/sender.md b/reference/execution/execution/sender.md
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- index 671e7c6cc..19c77f609 100644
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- --- a/reference/execution/execution/sender.md
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- +++ b/reference/execution/execution/sender.md
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- @@ -47,7 +47,7 @@ struct env-promise : with-await-transform& lt;env-promise& lt;Env& gt;& gt; {
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- const Env& amp; get_env() const noexcept;
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- };
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- ```
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- -* is-awaitable[link is-awaitable.md.nolink]
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- +* is-awaitable[link ../is-awaitable.md]
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- * env& lt;& gt;[link env.md.nolink]
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- * derived_from[link /reference/concepts/derived_from.md]
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- * coroutine_handle& lt;& gt;[link /reference/coroutine/coroutine_handle.md]
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- < /code>< /pre> </summary >
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-
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- <author >
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- <name >yoh</name >
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- <email >kawasaki.liamg@gmail.com</email >
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- </author >
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- </entry >
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-
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- <entry >
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- <title >is-awaitable -- execution: is-awaitable (#1384)</title >
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- <link href =" https://cpprefjp.github.io/reference/execution/is-awaitable.html" />
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- <id >c22f5566bef585080db7bde797aa85e25ba1e413:reference/execution/is-awaitable.md</id >
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- <updated >2025-04-14T22:11:13+09:00</updated >
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-
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- <summary type =" html" >< pre>< code> diff --git a/reference/execution/is-awaitable.md b/reference/execution/is-awaitable.md
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- new file mode 100644
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- index 000000000..c5cd3bec2
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- --- /dev/null
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- +++ b/reference/execution/is-awaitable.md
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- @@ -0,0 +1,66 @@
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- +# is-awaitable
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- +* execution[meta header]
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- +* concept[meta id-type]
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- +* std[meta namespace]
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- +* cpp26[meta cpp]
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- +
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- +```cpp
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- +template& lt;class C, class Promise& gt;
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- +concept is-awaitable;
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- +```
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- +
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- +## 概要
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- +`is-awaitable`は、Promise型をもつ[コルーチンのco_await演算子](/lang/cpp20/coroutines.md)オペランドにおいて`C`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。
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- +
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- +
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- +## 要件
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- +説明用の式`GET-AWAITER(c, p)`を、Promise型`p`をもつコルーチン内の`co_await`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。
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- +
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- +- (有効ならば)Promise型の`await_transform`メンバ関数を適用
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- +- (有効ならば)`co_await`演算子オーバーロードを適用
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- +
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- +また、説明用のコンセプト`await-suspend-result`, `is-awaiter`を以下のように定義する。
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- +
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- +```cpp
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- +template& lt;class T& gt;
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- +concept await-suspend-result = /*see below*/;
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- +
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- +template& lt;class A, class Promise& gt;
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- +concept is-awaiter =
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- + requires (A& amp; a, coroutine_handle& lt;Promise& gt; h) {
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- + a.await_ready() ? 1 : 0;
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- + { a.await_suspend(h) } -& gt; await-suspend-result;
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- + a.await_resume();
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- + };
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- +```
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- +* coroutine_handle[link /reference/coroutine/coroutine_handle.md]
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- +
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- +下記いずれかのうち1つが`true`のとき、`await-suspend-result& lt;T& gt;`は`true`となる。
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- +
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- +- `T`が`void`、もしくは
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- +- `T`が`bool`、もしくは
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- +- `T`が[`coroutine_handle`](/reference/coroutine/coroutine_handle.md)の特殊化
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- +
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- +`is-awaitable`コンセプトは、以下のように定義される。
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- +
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- +```cpp
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- +template& lt;class C, class Promise& gt;
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- +concept is-awaitable =
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- + requires (C (*fc)() noexcept, Promise& amp; p) {
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- + { GET-AWAITER(fc(), p) } -& gt; is-awaiter& lt;Promise& gt;;
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- + };
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- +```
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- +* GET-AWAITER[italic]
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- +
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- +
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- +## バージョン
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- +### 言語
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- +- C++26
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- +
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- +
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- +## 関連項目
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- +- [コルーチン](/lang/cpp20/coroutines.md)
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- +
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- +
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- +## 参照
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- +- [P2300R10 `std::execution`](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2300r10.html)
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- < /code>< /pre> </summary >
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-
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- <author >
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- <name >yoh</name >
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- <email >kawasaki.liamg@gmail.com</email >
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- </author >
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- </entry >
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-
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