Skip to content

Commit e978008

Browse files
author
cpprefjp-autoupdate
committed
update automatically
1 parent 179085a commit e978008

File tree

6 files changed

+419
-367
lines changed

6 files changed

+419
-367
lines changed

‎reference/execution/execution/sender.html

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -200,8 +200,8 @@
200200

201201
<p class="text-right"><small>
202202
最終更新日時(UTC):
203-
<span itemprop="datePublished" content="2025-04-12T16:25:01">
204-
2025年04月12日 16時25分01秒
203+
<span itemprop="datePublished" content="2025-04-14T13:11:13">
204+
2025年04月14日 13時11分13秒
205205
</span>
206206
<br/>
207207
<span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -249,7 +249,7 @@ <h2>要件</h2>
249249
<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>
250250
<span class="n">concept</span> <span class="n">enable</span><span class="o">-</span><span class="n">sender</span> <span class="o">=</span>
251251
<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>
252-
<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>
252+
<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>
253253

254254
<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>
255255
<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

Lines changed: 291 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,291 @@
1+
<!doctype html>
2+
<html class="cpprefjp" lang="ja" itemscope="" itemtype="http://schema.org/WebPage">
3+
<head>
4+
5+
6+
<!-- Google tag (gtag.js) -->
7+
<script async src="https://www.googletagmanager.com/gtag/js?id=G-NXNBNVBTJS"></script>
8+
<script>
9+
window.dataLayer = window.dataLayer || [];
10+
function gtag(){dataLayer.push(arguments);}
11+
gtag('js', new Date());
12+
13+
gtag('config', 'G-NXNBNVBTJS');
14+
</script>
15+
16+
17+
<meta charset="UTF-8">
18+
19+
<title>is-awaitable - cpprefjp C++日本語リファレンス</title>
20+
21+
<meta name="viewport" content="width=device-width,initial-scale=1">
22+
<meta name="keywords" content="
23+
C++,標準ライブラリ,リファレンス,ドキュメント,STL,std,execution,concept,std,cpp26
24+
">
25+
<meta name="title" content="is-awaitable - cpprefjp C++日本語リファレンス" />
26+
<meta itemprop="name" content="is-awaitable - cpprefjp C++日本語リファレンス" />
27+
<meta property="og:title" content="is-awaitable - cpprefjp C++日本語リファレンス" />
28+
<meta property="og:url" content="https://cpprefjp.github.io/reference/execution/is-awaitable.html" />
29+
<meta property="og:site_name" content="cpprefjp - C++日本語リファレンス" />
30+
<meta property="og:type" content="article" />
31+
<meta property="og:description" content="`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。" />
32+
<meta name="twitter:card" content="summary" />
33+
<meta name="twitter:title" content="is-awaitable - cpprefjp C++日本語リファレンス" />
34+
<meta name="twitter:url" content="https://cpprefjp.github.io/reference/execution/is-awaitable.html" />
35+
<meta name="twitter:description" content="`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。" />
36+
37+
38+
<link rel="alternate" type="application/atom+xml" title="Atom" href="https://cpprefjp.github.io/rss.xml" />
39+
40+
41+
<link rel="apple-touch-icon" sizes="180x180" href="../../static/favicons/apple-touch-icon.png?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e">
42+
<link rel="icon" type="image/png" sizes="32x32" href="../../static/favicons/favicon-32x32.png?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e">
43+
<link rel="icon" type="image/png" sizes="16x16" href="../../static/favicons/favicon-16x16.png?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e">
44+
<link rel="manifest" href="../../manifest.json?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e">
45+
<meta name="theme-color" content="#f5f8fc">
46+
47+
<link rel="stylesheet" href="../../static/pygments/default.css?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e">
48+
<!-- <link rel="stylesheet" href="../../static/css/root.css"> -->
49+
50+
51+
52+
53+
54+
<link href="../../static/kunai/css/kunai-stage-0.css?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e" rel="stylesheet">
55+
<link href="../../static/kunai/css/kunai-stage-1.css?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e" rel="stylesheet">
56+
<link href="../../static/kunai/css/kunai-stage-2.css?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e" rel="stylesheet">
57+
<link href="../../static/kunai/css/kunai-stage-3.css?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e" rel="stylesheet">
58+
59+
<script type="text/javascript" src="../../static/kunai/js/kunai-vendor.js?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e"></script>
60+
<script type="text/javascript" src="../../static/kunai/js/kunai.js?cachebust=2a7ddc62f9c987d65760cb7e6115f210c1266a7e"></script>
61+
62+
<script type="text/javascript">
63+
document.addEventListener('DOMContentLoaded', function() {
64+
var kn = new Kunai;
65+
kn.cpprefjp();
66+
});
67+
</script>
68+
69+
</head>
70+
<body>
71+
<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;execution&#34;], &#34;id-type&#34;: [&#34;concept&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;cpp&#34;: [&#34;cpp26&#34;]}, &#34;sources&#34;: [], &#34;page_id&#34;: [&#34;reference&#34;, &#34;execution&#34;, &#34;is-awaitable&#34;]}">
72+
<nav class="navbar navbar-default" role="navigation">
73+
<div class="container-fluid">
74+
<div class="navbar-header">
75+
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-collapse">
76+
<span class="sr-only">Toggle navigation</span>
77+
<span class="icon-bar"></span>
78+
<span class="icon-bar"></span>
79+
<span class="icon-bar"></span>
80+
</button>
81+
<a class="navbar-brand" href="../../index.html">
82+
<div class="title-wrapper clearfix">
83+
<div class="title">cpprefjp - C++日本語リファレンス</div>
84+
</div>
85+
</a>
86+
</div>
87+
88+
<div class="collapse navbar-collapse" id="navbar-collapse">
89+
<ul class="nav navbar-nav navbar-right">
90+
<li>
91+
<div class="google-search">
92+
93+
94+
<script>
95+
(function() {
96+
var cx = '013316413321391058734:ji_u66hl7hq';
97+
var gcse = document.createElement('script');
98+
gcse.type = 'text/javascript';
99+
gcse.async = true;
100+
gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
101+
'//www.google.com/cse/cse.js?cx=' + cx;
102+
var s = document.getElementsByTagName('script')[0];
103+
s.parentNode.insertBefore(gcse, s);
104+
})();
105+
</script>
106+
<div class="gcse-search"></div>
107+
108+
109+
</div>
110+
</li>
111+
<li>
112+
<a href="https://github.com/cpprefjp/site">GitHub Project</a>
113+
</li>
114+
</ul>
115+
</div>
116+
</div>
117+
</nav>
118+
</header>
119+
120+
<main id="main" role="main">
121+
<div class="container-fluid">
122+
<div class="row">
123+
<div class="col-sm-9 col-sm-push-3" itemscope itemtype="http://schema.org/Article">
124+
<div class="row">
125+
<div class="col-sm-12 google-search-result">
126+
<gcse:searchresults></gcse:searchresults>
127+
</div>
128+
</div>
129+
<div class="row">
130+
<div class="col-sm-12 content-header">
131+
132+
<ol class="breadcrumb">
133+
134+
<li itemscope itemtype="http://www.schema.org/SiteNavigationElement">
135+
<span>
136+
137+
<a href="../../index.html" itemprop="url">
138+
139+
<i class="fa fa-fw fa-home"></i>
140+
141+
</a>
142+
143+
</span>
144+
</li>
145+
146+
<li itemscope itemtype="http://www.schema.org/SiteNavigationElement">
147+
<span>
148+
149+
<a href="../../reference.html" itemprop="url">
150+
151+
<span itemprop="name">リファレンス</span>
152+
153+
</a>
154+
155+
</span>
156+
</li>
157+
158+
<li itemscope itemtype="http://www.schema.org/SiteNavigationElement">
159+
<span>
160+
161+
<a href="../../reference/execution.html" itemprop="url">
162+
163+
<span itemprop="name">execution</span>
164+
165+
</a>
166+
167+
</span>
168+
</li>
169+
170+
<li class="active" itemscope itemtype="http://www.schema.org/SiteNavigationElement">
171+
<span>
172+
173+
174+
<span itemprop="name">is-awaitable</span>
175+
176+
177+
</span>
178+
</li>
179+
180+
</ol>
181+
<div class="crsearch"></div>
182+
183+
</div>
184+
</div>
185+
<div class="row">
186+
<div class="col-sm-12 edit-button">
187+
188+
189+
<p class="text-right"><small>
190+
最終更新日時(UTC):
191+
<span itemprop="datePublished" content="2025-04-14T13:11:13">
192+
2025年04月14日 13時11分13秒
193+
</span>
194+
<br/>
195+
<span itemprop="author" itemscope itemtype="http://schema.org/Person">
196+
<span itemprop="name">yoh</span>
197+
</span>
198+
が更新
199+
</small></p>
200+
201+
202+
<p class="text-right">
203+
<a class="history" target="_blank" href="https://github.com/cpprefjp/site/commits/master/reference/execution/is-awaitable.md">
204+
<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
205+
</a>
206+
<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/execution/is-awaitable.md">
207+
<span class="fa fa-fw fa-pencil"></span>編集
208+
</a>
209+
</p>
210+
</div>
211+
</div>
212+
<div class="row">
213+
<div class="col-sm-12 content-body">
214+
215+
<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>
216+
<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>
217+
<span class="n">concept</span> <span class="n">is</span><span class="o">-</span><span class="n">awaitable</span><span class="p">;</span>
218+
</code></pre></div>
219+
</p>
220+
<h2>概要</h2>
221+
<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>
222+
<h2>要件</h2>
223+
<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>
224+
<ul>
225+
<li>（有効ならば）Promise型の<code>await_transform</code>メンバ関数を適用</li>
226+
<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>
227+
</ul>
228+
<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>
229+
<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>
230+
<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>
231+
232+
<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>
233+
<span class="n">concept</span> <span class="n">is</span><span class="o">-</span><span class="n">awaiter</span> <span class="o">=</span>
234+
<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>
235+
<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>
236+
<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>
237+
<span class="n">a</span><span class="p">.</span><span class="n">await_resume</span><span class="p">();</span>
238+
<span class="p">};</span>
239+
</code></pre></div>
240+
</p>
241+
<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>
242+
<ul>
243+
<li><code>T</code>が<code>void</code>、もしくは</li>
244+
<li><code>T</code>が<code>bool</code>、もしくは</li>
245+
<li><code>T</code>が<code><a href="../coroutine/coroutine_handle.html">coroutine_handle</a></code>の特殊化</li>
246+
</ul>
247+
<p><code>is-awaitable</code>コンセプトは、以下のように定義される。</p>
248+
<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>
249+
<span class="n">concept</span> <span class="n">is</span><span class="o">-</span><span class="n">awaitable</span> <span class="o">=</span>
250+
<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>
251+
<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>
252+
<span class="p">};</span>
253+
</code></pre></div>
254+
</p>
255+
<h2>バージョン</h2>
256+
<h3>言語</h3>
257+
<ul>
258+
<li>C++26</li>
259+
</ul>
260+
<h2>関連項目</h2>
261+
<ul>
262+
<li><a href="../../lang/cpp20/coroutines.html">コルーチン</a></li>
263+
</ul>
264+
<h2>参照</h2>
265+
<ul>
266+
<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>
267+
</ul></div>
268+
269+
</div>
270+
</div>
271+
</div>
272+
273+
274+
<div id="sidebar" class="col-sm-3 col-sm-pull-9">
275+
</div>
276+
277+
278+
</div>
279+
</div>
280+
</main>
281+
<footer class="footer navbar navbar-default">
282+
<div class="container-fluid">
283+
<p><small>
284+
本サイトの情報は、
285+
<a href="https://creativecommons.org/licenses/by/3.0/deed.ja" rel="nofollow">クリエイティブ・コモンズ 表示 3.0 非移植 ライセンス(CC BY)</a>
286+
の下に提供されています。
287+
</small></p>
288+
</div>
289+
</footer>
290+
</body>
291+
</html>

0 commit comments

Comments
 (0)