Repository navigation
Expand file tree
/
Copy pathhazard_pointer.html
More file actions
442 lines (376 loc) · 24.3 KB
/
Copy pathhazard_pointer.html
File metadata and controls
442 lines (376 loc) · 24.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
<!doctype html>
<html class="cpprefjp" lang="ja" itemscope="" itemtype="http://schema.org/WebPage">
<head>
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-NXNBNVBTJS"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-NXNBNVBTJS');
</script>
<meta charset="UTF-8">
<title>std::hazard_pointer - cpprefjp C++日本語リファレンス</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="keywords" content="
C++,標準ライブラリ,リファレンス,ドキュメント,STL,std,hazard_pointer,class,std,cpp26
">
<meta name="title" content="std::hazard_pointer - cpprefjp C++日本語リファレンス" />
<meta itemprop="name" content="std::hazard_pointer - cpprefjp C++日本語リファレンス" />
<meta property="og:title" content="std::hazard_pointer - cpprefjp C++日本語リファレンス" />
<meta property="og:url" content="https://cpprefjp.github.io/reference/hazard_pointer/hazard_pointer.html" />
<meta property="og:site_name" content="cpprefjp - C++日本語リファレンス" />
<meta property="og:type" content="article" />
<meta property="og:description" content="`hazard_pointer`は、1つのハザードポインタを所有するクラスである。" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:title" content="std::hazard_pointer - cpprefjp C++日本語リファレンス" />
<meta name="twitter:url" content="https://cpprefjp.github.io/reference/hazard_pointer/hazard_pointer.html" />
<meta name="twitter:description" content="`hazard_pointer`は、1つのハザードポインタを所有するクラスである。" />
<link rel="alternate" type="application/atom+xml" title="Atom" href="https://cpprefjp.github.io/rss.xml" />
<link rel="apple-touch-icon" sizes="180x180" href="../../static/favicons/apple-touch-icon.png?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58">
<link rel="icon" type="image/png" sizes="32x32" href="../../static/favicons/favicon-32x32.png?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58">
<link rel="icon" type="image/png" sizes="16x16" href="../../static/favicons/favicon-16x16.png?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58">
<link rel="manifest" href="../../manifest.json?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58">
<meta name="theme-color" content="#f5f8fc">
<link rel="stylesheet" href="../../static/pygments/default.css?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58">
<!-- <link rel="stylesheet" href="../../static/css/root.css"> -->
<link href="../../static/kunai/css/kunai-stage-0.css?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58" rel="stylesheet">
<link href="../../static/kunai/css/kunai-stage-1.css?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58" rel="stylesheet">
<link href="../../static/kunai/css/kunai-stage-2.css?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58" rel="stylesheet">
<link href="../../static/kunai/css/kunai-stage-3.css?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58" rel="stylesheet">
<script type="text/javascript" src="../../static/kunai/js/kunai-vendor.js?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58"></script>
<script type="text/javascript" src="../../static/kunai/js/kunai.js?cachebust=807374ab51c48a5ce84749cf2ad281ba69eb3e58"></script>
<script type="text/javascript">
document.addEventListener('DOMContentLoaded', function() {
var kn = new Kunai;
kn.cpprefjp();
});
</script>
</head>
<body>
<header data-kunai-mdinfo="{"meta": {"header": ["hazard_pointer"], "id-type": ["class"], "namespace": ["std"], "cpp": ["cpp26"]}, "sources": [{"id": "ac7da6c821951dc55815badb03c0bc7b591bdafe", "source": "#include <hazard_pointer>\n#include <atomic>\n#include <thread>\n#include <print>\n\nstruct Data : std::hazard_pointer_obj_base<Data> {\n int value;\n explicit Data(int v) : value(v) {}\n};\n\n// \u8907\u6570\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u4e26\u884c\u306b\u30a2\u30af\u30bb\u30b9\u3055\u308c\u308b\u5171\u6709\u30c7\u30fc\u30bf\nstd::atomic<Data*> data{new Data(0)};\n\n// \u8aad\u307f\u8fbc\u307f\u5074\u30b9\u30ec\u30c3\u30c9\nvoid reader()\n{\n // \u30cf\u30b6\u30fc\u30c9\u30dd\u30a4\u30f3\u30bf\u3067\u5171\u6709\u30c7\u30fc\u30bf\u3092\u4fdd\u8b77\u3057\u3066\u304b\u3089\u53c2\u7167\u3059\u308b\n std::hazard_pointer h = std::make_hazard_pointer();\n Data* p = h.protect(data);\n\n // \u66f4\u65b0\u5074\u30b9\u30ec\u30c3\u30c9\u304c data \u3092\u5dee\u3057\u66ff\u3048\u3066 retire \u3057\u3066\u3082\u3001\n // \u3053\u306e\u30cf\u30b6\u30fc\u30c9\u30dd\u30a4\u30f3\u30bf\u304c\u4fdd\u8b77\u3057\u3066\u3044\u308b\u9593\u306f *p \u306f\u56de\u53ce\u3055\u308c\u306a\u3044\n std::println(\"{}\", p->value);\n} // h \u306e\u30c7\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u4fdd\u8b77\u304c\u89e3\u9664\u3055\u308c\u308b\n\n// \u66f4\u65b0\u5074\u30b9\u30ec\u30c3\u30c9\nvoid updater()\n{\n // \u65b0\u3057\u3044\u30c7\u30fc\u30bf\u3067\u5dee\u3057\u66ff\u3048\u3001\u53d6\u308a\u5916\u3057\u305f\u53e4\u3044\u30c7\u30fc\u30bf\u3092\u56de\u53ce\u4e88\u7d04\u3059\u308b\n // (\u73fe\u5f79\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4ed6\u30b9\u30ec\u30c3\u30c9\u304c\u53c2\u7167\u3057\u3046\u308b\u306e\u3067 retire \u3057\u306a\u3044\u3002\n // \u5dee\u3057\u66ff\u3048\u3066\u53d6\u308a\u5916\u3057\u305f\u3082\u306e\u3060\u3051\u3092 retire \u3059\u308b)\n Data* old = data.exchange(new Data(1));\n old->retire();\n}\n\nint main()\n{\n // \u8aad\u307f\u8fbc\u307f\u30b9\u30ec\u30c3\u30c9\u3068\u66f4\u65b0\u30b9\u30ec\u30c3\u30c9\u3092\u4e26\u884c\u306b\u5b9f\u884c\u3059\u308b\n {\n std::jthread r{reader};\n std::jthread w{updater};\n } // \u4e21\u30b9\u30ec\u30c3\u30c9\u306e\u7d42\u4e86\u3092\u5f85\u3064\n\n // \u6700\u5f8c\u306b data \u304c\u6307\u3057\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3082\u56de\u53ce\u4e88\u7d04\u3059\u308b\n // (\u53d6\u308a\u5916\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092 retire \u3057\u5fd8\u308c\u308b\u3068\u56de\u53ce\u3055\u308c\u305a\u30ea\u30fc\u30af\u3059\u308b\u306e\u3067\u6ce8\u610f)\n data.load()->retire();\n}\n"}], "page_id": ["reference", "hazard_pointer", "hazard_pointer"]}">
<nav class="navbar navbar-default" role="navigation">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="../../index.html">
<div class="title-wrapper clearfix">
<div class="title">cpprefjp - C++日本語リファレンス</div>
</div>
</a>
</div>
<div class="collapse navbar-collapse" id="navbar-collapse">
<ul class="nav navbar-nav navbar-right">
<li>
<div class="google-search">
<script>
(function() {
var cx = '013316413321391058734:ji_u66hl7hq';
var gcse = document.createElement('script');
gcse.type = 'text/javascript';
gcse.async = true;
gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
'//www.google.com/cse/cse.js?cx=' + cx;
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(gcse, s);
})();
</script>
<div class="gcse-search"></div>
</div>
</li>
<li>
<a href="https://github.com/cpprefjp/site">GitHub Project</a>
</li>
</ul>
</div>
</div>
</nav>
</header>
<main id="main" role="main">
<div class="container-fluid">
<div class="row">
<div class="col-sm-9 col-sm-push-3" itemscope itemtype="http://schema.org/Article">
<div class="row">
<div class="col-sm-12 google-search-result">
<gcse:searchresults></gcse:searchresults>
</div>
</div>
<div class="row">
<div class="col-sm-12 content-header">
<ol class="breadcrumb">
<li itemscope itemtype="http://www.schema.org/SiteNavigationElement">
<span>
<a href="../../index.html" itemprop="url">
<i class="fa fa-fw fa-home"></i>
</a>
</span>
</li>
<li itemscope itemtype="http://www.schema.org/SiteNavigationElement">
<span>
<a href="../../reference.html" itemprop="url">
<span itemprop="name">リファレンス</span>
</a>
</span>
</li>
<li itemscope itemtype="http://www.schema.org/SiteNavigationElement">
<span>
<a href="../../reference/hazard_pointer.html" itemprop="url">
<span itemprop="name">hazard_pointer</span>
</a>
</span>
</li>
<li class="active" itemscope itemtype="http://www.schema.org/SiteNavigationElement">
<span>
<span itemprop="name">hazard_pointer</span>
</span>
</li>
</ol>
<div class="crsearch"></div>
</div>
</div>
<div class="row">
<div class="col-sm-12 edit-button">
<p class="text-right"><small>
最終更新日時:
<time itemprop="datePublished" class="js-local-time"
datetime="2026-09-11T13:06:31+09:00">
2026年09月11日 13時06分31秒 (JST)
</time>
<br/>
<span itemprop="author" itemscope itemtype="http://schema.org/Person">
<span itemprop="name">Akira Takahashi</span>
</span>
が更新
</small></p>
<script>
(function () {
// 最終更新日時を閲覧者のローカルタイムゾーンで表示し直す (issue #53 の正規化)。
// JS が無効な環境ではサーバ生成の JST 表記がそのまま残る。
function pad(n) { return (n < 10 ? '0' : '') + n; }
var els = document.querySelectorAll('time.js-local-time[datetime]');
for (var i = 0; i < els.length; i++) {
var el = els[i];
var d = new Date(el.getAttribute('datetime'));
if (isNaN(d.getTime())) { continue; }
var tz = '';
try {
var parts = new Intl.DateTimeFormat(undefined, { timeZoneName: 'short' }).formatToParts(d);
for (var j = 0; j < parts.length; j++) {
if (parts[j].type === 'timeZoneName') { tz = parts[j].value; break; }
}
} catch (e) {}
el.textContent = d.getFullYear() + '年' + pad(d.getMonth() + 1) + '月' + pad(d.getDate()) + '日 '
+ pad(d.getHours()) + '時' + pad(d.getMinutes()) + '分' + pad(d.getSeconds()) + '秒'
+ (tz ? ' (' + tz + ')' : '');
}
})();
</script>
<p class="text-right">
<a class="history" target="_blank" href="https://github.com/cpprefjp/site/commits/master/reference/hazard_pointer/hazard_pointer.md">
<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
</a>
<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/hazard_pointer/hazard_pointer.md">
<span class="fa fa-fw fa-pencil"></span>編集
</a>
</p>
</div>
</div>
<div class="row">
<div class="col-sm-12 content-body">
<div class="identifier-type">class</div><div class="header"><hazard_pointer></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">hazard_pointer</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">hazard_pointer</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>hazard_pointer</code>は、1つのハザードポインタを所有するクラスである。</p>
<p>このクラスのオブジェクトは、「空 (empty)」であるか、ちょうど1つのハザードポインタを所有するかのいずれかである。ハザードポインタは同時に高々1つのスレッドから所有され、その所有スレッドだけが値を設定できる。ムーブのみ可能で、コピーはできない。</p>
<p>オブジェクトは通常、<code><a href="make_hazard_pointer.html">make_hazard_pointer()</a></code>関数で構築する。参照したい共有オブジェクトを<code><a href="hazard_pointer/protect.html">protect()</a></code>メンバ関数で保護すると、その保護が解除される (デストラクタや<code><a href="hazard_pointer/reset_protection.html">reset_protection()</a></code>メンバ関数) まで、そのオブジェクトは<code><a href="hazard_pointer_obj_base/retire.html">retire()</a></code>されても回収されない。</p>
<p><div class="codehilite"><pre><span></span><code><span class="n">std</span><span class="o">::</span><span class="n">hazard_pointer</span><span class="w"> </span><span class="n">h</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">make_hazard_pointer</span><span class="p">();</span>
<span class="n">Data</span><span class="o">*</span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">h</span><span class="p">.</span><span class="n">protect</span><span class="p">(</span><span class="n">shared_ptr_atomic</span><span class="p">);</span><span class="w"> </span><span class="c1">// 保護開始</span>
<span class="c1">// ... *p を安全に参照できる ...</span>
<span class="c1">// h のスコープ終了で保護終了</span>
</code></pre></div>
</p>
<h2>メンバ関数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="hazard_pointer/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="hazard_pointer/op_destructor.html">(destructor)</a></code></td>
<td>デストラクタ</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="hazard_pointer/op_assign.html">operator=</a></code></td>
<td>ムーブ代入演算子</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="hazard_pointer/empty.html">empty</a></code></td>
<td>空かどうかを判定する</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="hazard_pointer/protect.html">protect</a></code></td>
<td>オブジェクトを保護する</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="hazard_pointer/try_protect.html">try_protect</a></code></td>
<td>オブジェクトの保護を試みる</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="hazard_pointer/reset_protection.html">reset_protection</a></code></td>
<td>保護を解除する</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="hazard_pointer/swap.html">swap</a></code></td>
<td>他の<code>hazard_pointer</code>オブジェクトと入れ替える</td>
<td>C++26</td>
</tr>
</tbody>
</table>
<h2>非メンバ関数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="hazard_pointer/swap_free.html">swap</a></code></td>
<td>2つの<code>hazard_pointer</code>オブジェクトを入れ替える</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="make_hazard_pointer.html">make_hazard_pointer</a></code></td>
<td>ハザードポインタを構築する</td>
<td>C++26</td>
</tr>
<tr>
<td><code><a href="make_hazard_pointer_batch.html">make_hazard_pointer_batch</a></code></td>
<td>複数のハザードポインタをまとめて構築する</td>
<td>C++29</td>
</tr>
<tr>
<td><code><a href="clear_hazard_pointer_batch.html">clear_hazard_pointer_batch</a></code></td>
<td>複数のハザードポインタをまとめて破棄する</td>
<td>C++29</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="ac7da6c821951dc55815badb03c0bc7b591bdafe"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../hazard_pointer.html"><hazard_pointer></a></span>
<span class="cp">#include <a href="../atomic.html"><atomic></a></span>
<span class="cp">#include <a href="../thread.html"><thread></a></span>
<span class="cp">#include <a href="../print.html"><print></a></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">Data</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n"><a href="hazard_pointer_obj_base.html">std::hazard_pointer_obj_base</a></span><span class="o"><</span><span class="n">Data</span><span class="o">></span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">value</span><span class="p">;</span>
<span class="w"> </span><span class="k">explicit</span><span class="w"> </span><span class="n">Data</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">value</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="p">{}</span>
<span class="p">};</span>
<span class="c1">// 複数スレッドから並行にアクセスされる共有データ</span>
<span class="n"><a href="../atomic/atomic.html">std::atomic</a></span><span class="o"><</span><span class="n">Data</span><span class="o">*></span><span class="w"> </span><span class="n">data</span><span class="p">{</span><span class="k">new</span><span class="w"> </span><span class="n">Data</span><span class="p">(</span><span class="mi">0</span><span class="p">)};</span>
<span class="c1">// 読み込み側スレッド</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">reader</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// ハザードポインタで共有データを保護してから参照する</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::hazard_pointer</span></span><span class="w"> </span><span class="n">h</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="make_hazard_pointer.html">std::make_hazard_pointer</a></span><span class="p">();</span>
<span class="w"> </span><span class="n">Data</span><span class="o">*</span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="hazard_pointer/protect.html">h.protect</a></span><span class="p">(</span><span class="n">data</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 更新側スレッドが data を差し替えて retire しても、</span>
<span class="w"> </span><span class="c1">// このハザードポインタが保護している間は *p は回収されない</span>
<span class="w"> </span><span class="n"><a href="../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"{}"</span><span class="p">,</span><span class="w"> </span><span class="n">p</span><span class="o">-></span><span class="n">value</span><span class="p">);</span>
<span class="p">}</span><span class="w"> </span><span class="c1">// h のデストラクタで保護が解除される</span>
<span class="c1">// 更新側スレッド</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">updater</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// 新しいデータで差し替え、取り外した古いデータを回収予約する</span>
<span class="w"> </span><span class="c1">// (現役のオブジェクトは他スレッドが参照しうるので retire しない。</span>
<span class="w"> </span><span class="c1">// 差し替えて取り外したものだけを retire する)</span>
<span class="w"> </span><span class="n">Data</span><span class="o">*</span><span class="w"> </span><span class="n">old</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">data</span><span class="p">.</span><span class="n"><a href="../atomic/atomic/exchange.html">exchange</a></span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">Data</span><span class="p">(</span><span class="mi">1</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="hazard_pointer_obj_base/retire.html">old->retire()</a></span><span class="p">;</span>
<span class="p">}</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// 読み込みスレッドと更新スレッドを並行に実行する</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../thread/jthread.html">std::jthread</a></span><span class="w"> </span><span class="n">r</span><span class="p">{</span><span class="n">reader</span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="../thread/jthread.html">std::jthread</a></span><span class="w"> </span><span class="n">w</span><span class="p">{</span><span class="n">updater</span><span class="p">};</span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// 両スレッドの終了を待つ</span>
<span class="w"> </span><span class="c1">// 最後に data が指しているオブジェクトも回収予約する</span>
<span class="w"> </span><span class="c1">// (取り外したオブジェクトを retire し忘れると回収されずリークするので注意)</span>
<span class="w"> </span><span class="n"><a href="../atomic/atomic/load.html">data.load()</a></span><span class="o">-></span><span class="n">retire</span><span class="p">();</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力例</h3>
<p><pre><code>0
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++26</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../implementation.html#gcc">GCC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="hazard_pointer_obj_base.html">std::hazard_pointer_obj_base</a></code></li>
<li><code><a href="make_hazard_pointer.html">std::make_hazard_pointer</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2530r3.pdf" target="_blank">P2530R3 Hazard Pointers for C++26</a><ul>
<li>C++26で追加された</li>
</ul>
</li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2422r1.html" target="_blank">P2422R1 Remove <code>nodiscard</code> annotations from the standard library specification</a><ul>
<li>C++26で<code>empty</code>メンバ関数の<code>[[nodiscard]]</code>指定が削除された</li>
</ul>
</li>
</ul></div>
</div>
</div>
</div>
<div id="sidebar" class="col-sm-3 col-sm-pull-9">
</div>
</div>
</div>
</main>
<footer class="footer navbar navbar-default">
<div class="container-fluid">
<p><small>
本サイトの情報は、
<a href="https://creativecommons.org/licenses/by/4.0/deed.ja" rel="nofollow">クリエイティブ・コモンズ 表示 4.0 国際 ライセンス(CC BY)</a>
の下に提供されています。
</small></p>
</div>
</footer>
</body>
</html>

