-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathswap.html
More file actions
432 lines (355 loc) · 33.5 KB
/
Copy pathswap.html
File metadata and controls
432 lines (355 loc) · 33.5 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
<!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::ranges::swap - 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,concepts,cpo,std::ranges,cpp20
">
<meta name="title" content="std::ranges::swap - cpprefjp C++日本語リファレンス" />
<meta itemprop="name" content="std::ranges::swap - cpprefjp C++日本語リファレンス" />
<meta property="og:title" content="std::ranges::swap - cpprefjp C++日本語リファレンス" />
<meta property="og:url" content="https://cpprefjp.github.io/reference/concepts/swap.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="" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:title" content="std::ranges::swap - cpprefjp C++日本語リファレンス" />
<meta name="twitter:url" content="https://cpprefjp.github.io/reference/concepts/swap.html" />
<meta name="twitter:description" content="" />
<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=557cd0469f26f0f797224f46d1b6e764266f07cc">
<link rel="icon" type="image/png" sizes="32x32" href="../../static/favicons/favicon-32x32.png?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc">
<link rel="icon" type="image/png" sizes="16x16" href="../../static/favicons/favicon-16x16.png?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc">
<link rel="manifest" href="../../manifest.json?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc">
<meta name="theme-color" content="#f5f8fc">
<link rel="stylesheet" href="../../static/pygments/default.css?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc">
<!-- <link rel="stylesheet" href="../../static/css/root.css"> -->
<link href="../../static/kunai/css/kunai-stage-0.css?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc" rel="stylesheet">
<link href="../../static/kunai/css/kunai-stage-1.css?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc" rel="stylesheet">
<link href="../../static/kunai/css/kunai-stage-2.css?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc" rel="stylesheet">
<link href="../../static/kunai/css/kunai-stage-3.css?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc" rel="stylesheet">
<script type="text/javascript" src="../../static/kunai/js/kunai-vendor.js?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc"></script>
<script type="text/javascript" src="../../static/kunai/js/kunai.js?cachebust=557cd0469f26f0f797224f46d1b6e764266f07cc"></script>
<script type="text/javascript">
document.addEventListener('DOMContentLoaded', function() {
var kn = new Kunai;
kn.cpprefjp();
});
</script>
</head>
<body>
<header data-kunai-mdinfo="{"meta": {"header": ["concepts"], "id-type": ["cpo"], "namespace": ["std::ranges"], "cpp": ["cpp20"]}, "sources": [{"id": "e8aa4d1cfed710a851fbfee1ff78e73087611be6", "source": "#include <iostream>\n#include <concepts>\n#include <utility>\n\nnamespace NS {\n struct swappable1 {\n int n = 0;\n\n swappable1(int m) : n(m) {}\n\n swappable1(swappable1&&) = delete;\n };\n\n // \u975e\u30e1\u30f3\u30d0\u95a2\u6570\u3068\u3057\u3066\u5b9a\u7fa9\n void swap(swappable1& lhs, swappable1& rhs) {\n std::swap(lhs.n, rhs.n);\n }\n\n\n struct swappable2 {\n double d = 0.0;\n\n swappable2(double v) : d(v) {}\n\n swappable2(swappable2&&) = delete;\n\n // Hidden friends\u306a\u95a2\u6570\u3068\u3057\u3066\u5b9a\u7fa9\n friend void swap(swappable2& lhs, swappable2& rhs) {\n std::swap(lhs.d, rhs.d);\n }\n };\n}\n\nint main() {\n {\n int a = 5, b = 7;\n std::ranges::swap(a, b);\n\n std::cout << \"a = \" << a << \", b = \" << b << std::endl;\n }\n std::cout << \"\\n\";\n {\n NS::swappable1 a{11}, b{13};\n std::ranges::swap(a, b);\n\n std::cout << \"a = \" << a.n << \", b = \" << b.n << std::endl;\n }\n std::cout << \"\\n\";\n {\n NS::swappable2 a{3.14}, b{2.71};\n std::ranges::swap(a, b);\n\n std::cout << \"a = \" << a.d << \", b = \" << b.d << std::endl;\n }\n std::cout << \"\\n\";\n {\n int a[] = {1, 3, 5, 7}, b[] = {0, 2, 4, 6};\n std::ranges::swap(a, b);\n\n std::cout << \"a = {\";\n for (int n : a) std::cout << n << \", \";\n std::cout << \"}, b = {\";\n for (int n : b) std::cout << n << \", \";\n std::cout << \"}\";\n }\n}\n"}], "page_id": ["reference", "concepts", "swap"]}">
<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/concepts.html" itemprop="url">
<span itemprop="name">concepts</span>
</a>
</span>
</li>
<li class="active" itemscope itemtype="http://www.schema.org/SiteNavigationElement">
<span>
<span itemprop="name">swap</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="2026-07-22T16:08:23+09:00">
2026年07月22日 16時08分23秒 (JST)
</time>
<br/>
<span itemprop="author" itemscope itemtype="http://schema.org/Person">
<span itemprop="name">rotarymars</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/concepts/swap.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/concepts/swap.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">customization point object</div><div class="header"><concepts></div><h1 itemprop="name"><span class="namespace" title="namespace std::ranges">std::ranges::</span><span class="token">swap</span><span class="cpp cpp20" title="C++20で追加">(C++20)</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="o">::</span><span class="nn">ranges</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kr">inline</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="cm">/*unspecified*/</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="cm">/*unspecified*/</span><span class="w"> </span><span class="n">swap</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="cm">/*unspecified*/</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>ranges::swap</code>は2つの引数を受け取り、それらの値の交換を行う関数オブジェクトである。</p>
<h2>効果</h2>
<p><code>std::ranges::swap(a, b)</code>のように呼び出された時、以下のいずれかと等価（上から順に考慮される）</p>
<ol>
<li>
<p>引数<code>a, b</code>の型がクラス型であるか列挙型であり、<code>std::ranges::swap</code>（本関数オブジェクト）の宣言を含まず下記の<code>swap</code>関数宣言を含むコンテキストで、<code>void(swap(a, b))</code>が呼び出し可能ならば<code>void(swap(a, b))</code>
<br />
<div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="kt">void</span><span class="w"> </span><span class="n">swap</span><span class="p">(</span><span class="n">T</span><span class="o">&</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
</code></pre></div>
</p>
</li>
<li>
<p><code>a, b</code>が共に同じ長さの配列型の左辺値であり、<code>ranges::swap(*a, *b)</code>が呼び出し可能ならば<code>ranges::swap_ranges(a, b)</code></p>
<ul>
<li>1か3に委譲して要素毎に<code>swap</code>される</li>
</ul>
</li>
<li>
<p><code>a, b</code>が共に同じ型<code>T</code>の左辺値であり、<code>T</code>と<code>T&</code>は<code><a href="move_constructible.html">move_constructible<T></a></code>及び<code><a href="assignable_from.html">assignable_from<T&, T></a></code>のモデルとなる場合、<code><a href="../utility/swap.html">std::swap()</a></code>相当の操作によって<code>a, b</code>の値を交換する。</p>
</li>
<li>
<p>それ以外の場合、呼び出しは<a class="cpprefjp-defined-word" data-desc="プログラムが適格でないこと。コンパイルエラーなどになる" href="../../implementation-compliance.html#dfn-ill-formed">不適格</a>。</p>
</li>
</ol>
<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>
<p>何も返さない。<br />
<code>std::ranges::swap(a, b)</code>の呼び出しが有効であるならば、常に<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>型は<code>void</code>となる。</p>
<h2><a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a></h2>
<p>上記「効果」節のそれぞれのケース毎に</p>
<ol>
<li>呼び出される<code>swap(a, b)</code>（及び、もし返されるのならば<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>のデストラクタ）が<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>を送出するかに従う</li>
<li><code>noexcept(ranges::swap(*a, *b))</code>が指定される</li>
<li><code>noexcept(is_nothrow_move_constructible_v<T> && is_nothrow_move_assignable_v<T>)</code>が指定される</li>
</ol>
<h2>定数式に評価される条件</h2>
<p>上記「効果」節のそれぞれのケース毎に</p>
<ol>
<li>呼び出される<code>swap(a, b)</code>（及び、もし返されるのならば<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>のデストラクタ）が定数評価可能であるかに従う。</li>
<li><code>a, b</code>の要素型によって、1か3に従う</li>
<li>以下の条件を全て満たす場合に定数評価可能<ul>
<li><code>T</code>はリテラル型である</li>
<li><code>a = std::move(b), b = std::move(a)</code>は共に定数評価可能</li>
<li>次のような初期化式が定数評価可能
<br />
<div class="codehilite"><pre><span></span><code><span class="n">T</span><span class="w"> </span><span class="nf">t1</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">a</span><span class="p">));</span>
<span class="n">T</span><span class="w"> </span><span class="nf">t2</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">b</span><span class="p">));</span>
</code></pre></div>
</li>
</ul>
</li>
</ol>
<h2>カスタマイゼーションポイント</h2>
<p>上記「効果」節1のケースでは、<a class="cpprefjp-defined-word" data-desc="プログラム定義。ユーザー（プログラマ）によって定義されること（標準ライブラリで定義されるものを除く）">ユーザー定義</a>の<code>swap()</code>を定義しておくことによって実行される交換操作をカスタマイズすることができる。</p>
<ol>
<li><code>a, b</code>のどちらかの型と同じ名前空間で、もしくは<a href="../../article/lib/hidden_friends.html"><em>Hidden friends</em></a>として、<code>a, b</code>の型のペアについて呼び出し可能な<code>swap()</code>を定義しておく</li>
<li>その要素型について、1にアダプトしておく</li>
<li>--</li>
</ol>
<h2>備考</h2>
<p>上記「効果」節1の場合に、呼び出された<code>swap()</code>関数が実際には交換操作を行わない場合はプログラムは<a class="cpprefjp-defined-word" data-desc="プログラムが適格でないこと。コンパイルエラーなどになる" href="../../implementation-compliance.html#dfn-ill-formed">不適格</a>。ただし、その診断は要求されていない（<a class="cpprefjp-defined-word" data-desc="未定義の動作。処理系は予期せぬ動作をする可能性がある。要するに動作保証対象外。undefined behavior (UB)。" href="../../implementation-compliance.html#dfn-undefined-behavior">未定義動作</a>となりえる）。</p>
<h2>例</h2>
<p><div class="yata" id="e8aa4d1cfed710a851fbfee1ff78e73087611be6"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../concepts.html"><concepts></a></span>
<span class="cp">#include <a href="../utility.html"><utility></a></span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">NS</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">swappable1</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">n</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="w"> </span><span class="n">swappable1</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">m</span><span class="p">)</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">n</span><span class="p">(</span><span class="n">m</span><span class="p">)</span><span class="w"> </span><span class="p">{}</span>
<span class="w"> </span><span class="n">swappable1</span><span class="p">(</span><span class="n">swappable1</span><span class="o">&&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
<span class="w"> </span><span class="p">};</span>
<span class="w"> </span><span class="c1">// 非メンバ関数として定義</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">swap</span><span class="p">(</span><span class="n">swappable1</span><span class="o">&</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">swappable1</span><span class="o">&</span><span class="w"> </span><span class="n">rhs</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">swap</span><span class="p">(</span><span class="n">lhs</span><span class="p">.</span><span class="n">n</span><span class="p">,</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">n</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">swappable2</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.0</span><span class="p">;</span>
<span class="w"> </span><span class="n">swappable2</span><span class="p">(</span><span class="kt">double</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">d</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="p">{}</span>
<span class="w"> </span><span class="n">swappable2</span><span class="p">(</span><span class="n">swappable2</span><span class="o">&&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// Hidden friendsな関数として定義</span>
<span class="w"> </span><span class="k">friend</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">swap</span><span class="p">(</span><span class="n">swappable2</span><span class="o">&</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">swappable2</span><span class="o">&</span><span class="w"> </span><span class="n">rhs</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">swap</span><span class="p">(</span><span class="n">lhs</span><span class="p">.</span><span class="n">d</span><span class="p">,</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">d</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">};</span>
<span class="p">}</span>
<span class="kt">int</span><span class="w"> </span><span class="n">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</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">a</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">5</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">7</span><span class="p">;</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n"><span style="color:#ff0000">ranges::swap</span></span><span class="p">(</span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"a = "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", b = "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">b</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">NS</span><span class="o">::</span><span class="n">swappable1</span><span class="w"> </span><span class="n">a</span><span class="p">{</span><span class="mi">11</span><span class="p">},</span><span class="w"> </span><span class="n">b</span><span class="p">{</span><span class="mi">13</span><span class="p">};</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n"><span style="color:#ff0000">ranges::swap</span></span><span class="p">(</span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"a = "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a</span><span class="p">.</span><span class="n">n</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", b = "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">b</span><span class="p">.</span><span class="n">n</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">NS</span><span class="o">::</span><span class="n">swappable2</span><span class="w"> </span><span class="n">a</span><span class="p">{</span><span class="mf">3.14</span><span class="p">},</span><span class="w"> </span><span class="n">b</span><span class="p">{</span><span class="mf">2.71</span><span class="p">};</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n"><span style="color:#ff0000">ranges::swap</span></span><span class="p">(</span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"a = "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a</span><span class="p">.</span><span class="n">d</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", b = "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">b</span><span class="p">.</span><span class="n">d</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</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">a</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">5</span><span class="p">,</span><span class="w"> </span><span class="mi">7</span><span class="p">},</span><span class="w"> </span><span class="n">b</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="mi">6</span><span class="p">};</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n"><span style="color:#ff0000">ranges::swap</span></span><span class="p">(</span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"a = {"</span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">a</span><span class="p">)</span><span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", "</span><span class="p">;</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"}, b = {"</span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">b</span><span class="p">)</span><span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", "</span><span class="p">;</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"}"</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>a = 7, b = 5
a = 13, b = 11
a = 2.71, b = 3.14
a = {0, 2, 4, 6, }, b = {1, 3, 5, 7, }
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++20</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>: 10.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2019 Update 3 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><a href="../../lang/cpp20/concepts.html">C++20 コンセプト</a></li>
<li><code><a href="../utility/swap.html">std::swap()</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0898r3.pdf" target="_blank">P0898R3 Standard Library Concepts</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1754r1.pdf" target="_blank">P1754R1 Rename concepts to standard_case for C++20, while we still can</a></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 非移植 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>