-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathop_constructor.html
More file actions
439 lines (361 loc) · 37.4 KB
/
Copy pathop_constructor.html
File metadata and controls
439 lines (361 loc) · 37.4 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
<!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::hive::コンストラクタ - 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,hive,std,hive,function,cpp26
">
<meta name="title" content="std::hive::コンストラクタ - cpprefjp C++日本語リファレンス" />
<meta itemprop="name" content="std::hive::コンストラクタ - cpprefjp C++日本語リファレンス" />
<meta property="og:title" content="std::hive::コンストラクタ - cpprefjp C++日本語リファレンス" />
<meta property="og:url" content="https://cpprefjp.github.io/reference/hive/hive/op_constructor.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="`hive`オブジェクトを構築する。" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:title" content="std::hive::コンストラクタ - cpprefjp C++日本語リファレンス" />
<meta name="twitter:url" content="https://cpprefjp.github.io/reference/hive/hive/op_constructor.html" />
<meta name="twitter:description" content="`hive`オブジェクトを構築する。" />
<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=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": ["hive"], "namespace": ["std"], "class": ["hive"], "id-type": ["function"], "cpp": ["cpp26"]}, "sources": [{"id": "763e97b5a7fbf8da5a1e286cc32256c4059e7d04", "source": "#include <hive>\n#include <iterator>\n#include <print>\n\nint main()\n{\n // \u30c7\u30d5\u30a9\u30eb\u30c8\u69cb\u7bc9\n std::hive<int> h1;\n\n // n\u500b\u306e\u5024\u3092\u4fdd\u6301\u3059\u308b\n std::hive<int> h2(3, 1);\n\n // \u30a4\u30c6\u30ec\u30fc\u30bf\u7bc4\u56f2\u304b\u3089\u69cb\u7bc9\n int a[] = {1, 2, 3};\n std::hive<int> h3(std::begin(a), std::end(a));\n\n // \u521d\u671f\u5316\u5b50\u30ea\u30b9\u30c8\u304b\u3089\u69cb\u7bc9\n std::hive<int> h4 = {1, 2, 3};\n\n // \u30b3\u30d4\u30fc\u69cb\u7bc9\n std::hive<int> h5 = h4;\n\n std::println(\"h1.size() = {}\", h1.size());\n std::println(\"h2.size() = {}\", h2.size());\n std::println(\"h3.size() = {}\", h3.size());\n std::println(\"h4.size() = {}\", h4.size());\n std::println(\"h5.size() = {}\", h5.size());\n}\n"}], "page_id": ["reference", "hive", "hive", "op_constructor"]}">
<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/hive.html" itemprop="url">
<span itemprop="name">hive</span>
</a>
</span>
</li>
<li itemscope itemtype="http://www.schema.org/SiteNavigationElement">
<span>
<a href="../../../reference/hive/hive.html" itemprop="url">
<span itemprop="name">hive</span>
</a>
</span>
</li>
<li class="active" itemscope itemtype="http://www.schema.org/SiteNavigationElement">
<span>
<span itemprop="name">コンストラクタ</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="2026-08-12T14:06:15+09:00">
2026年08月12日 14時06分15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/hive/hive/op_constructor.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/hive/hive/op_constructor.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">function</div><div class="header"><hive></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class hive">hive::</span><span class="token">コンストラクタ</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">constexpr</span><span class="w"> </span><span class="n">hive</span><span class="p">()</span><span class="w"> </span><span class="k">noexcept</span><span class="p">(</span><span class="k">noexcept</span><span class="p">(</span><span class="n">Allocator</span><span class="p">()));</span><span class="w"> </span><span class="c1">// (1) C++26</span>
<span class="k">constexpr</span><span class="w"> </span><span class="k">explicit</span><span class="w"> </span><span class="n">hive</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span><span class="w"> </span><span class="c1">// (2) C++26</span>
<span class="k">constexpr</span><span class="w"> </span><span class="k">explicit</span><span class="w"> </span><span class="n">hive</span><span class="p">(</span><span class="n"><a href="../hive_limits.html">hive_limits</a></span><span class="w"> </span><span class="n">block_limits</span><span class="p">);</span><span class="w"> </span><span class="c1">// (3) C++26</span>
<span class="k">constexpr</span><span class="w"> </span><span class="n">hive</span><span class="p">(</span><span class="n"><a href="../hive_limits.html">hive_limits</a></span><span class="w"> </span><span class="n">block_limits</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="p">);</span><span class="w"> </span><span class="c1">// (4) C++26</span>
<span class="k">explicit</span><span class="w"> </span><span class="n">hive</span><span class="p">(</span><span class="n">size_type</span><span class="w"> </span><span class="n">n</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (5) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="n">size_type</span><span class="w"> </span><span class="n">n</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../hive_limits.html">hive_limits</a></span><span class="w"> </span><span class="n">block_limits</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (6) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="n">size_type</span><span class="w"> </span><span class="n">n</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (7) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="n">size_type</span><span class="w"> </span><span class="n">n</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../hive_limits.html">hive_limits</a></span><span class="w"> </span><span class="n">block_limits</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (8) C++26</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="o">></span>
<span class="n">hive</span><span class="p">(</span><span class="n">InputIterator</span><span class="w"> </span><span class="n">first</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator</span><span class="w"> </span><span class="n">last</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (9) C++26</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="o">></span>
<span class="n">hive</span><span class="p">(</span><span class="n">InputIterator</span><span class="w"> </span><span class="n">first</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator</span><span class="w"> </span><span class="n">last</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../hive_limits.html">hive_limits</a></span><span class="w"> </span><span class="n">block_limits</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (10) C++26</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="n">container</span><span class="o">-</span><span class="n">compatible</span><span class="o">-</span><span class="n"><a href="../../ranges/range.html">range</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">R</span><span class="o">></span>
<span class="n">hive</span><span class="p">(</span><span class="n"><a href="../../ranges/from_range_t.html">from_range_t</a></span><span class="p">,</span><span class="w"> </span><span class="n">R</span><span class="o">&&</span><span class="w"> </span><span class="n">rg</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (11) C++26</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="n">container</span><span class="o">-</span><span class="n">compatible</span><span class="o">-</span><span class="n"><a href="../../ranges/range.html">range</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">R</span><span class="o">></span>
<span class="n">hive</span><span class="p">(</span><span class="n"><a href="../../ranges/from_range_t.html">from_range_t</a></span><span class="p">,</span><span class="w"> </span><span class="n">R</span><span class="o">&&</span><span class="w"> </span><span class="n">rg</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../hive_limits.html">hive_limits</a></span><span class="w"> </span><span class="n">block_limits</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (12) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">hive</span><span class="o">&</span><span class="w"> </span><span class="n">x</span><span class="p">);</span><span class="w"> </span><span class="c1">// (13) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="n">hive</span><span class="o">&&</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span><span class="w"> </span><span class="c1">// (14) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">hive</span><span class="o">&</span><span class="w"> </span><span class="n">x</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../type_traits/type_identity.html">type_identity_t</a></span><span class="o"><</span><span class="n">Allocator</span><span class="o">>&</span><span class="w"> </span><span class="n">alloc</span><span class="p">);</span><span class="w"> </span><span class="c1">// (15) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="n">hive</span><span class="o">&&</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../type_traits/type_identity.html">type_identity_t</a></span><span class="o"><</span><span class="n">Allocator</span><span class="o">>&</span><span class="w"> </span><span class="n">alloc</span><span class="p">);</span><span class="w"> </span><span class="c1">// (16) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="n"><a href="../../initializer_list/initializer_list.html">initializer_list</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">il</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (17) C++26</span>
<span class="n">hive</span><span class="p">(</span><span class="n"><a href="../../initializer_list/initializer_list.html">initializer_list</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">il</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../hive_limits.html">hive_limits</a></span><span class="w"> </span><span class="n">block_limits</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Allocator</span><span class="o">&</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Allocator</span><span class="p">());</span><span class="w"> </span><span class="c1">// (18) C++26</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>hive</code>オブジェクトを構築する。</p>
<ul>
<li>(1) : デフォルトコンストラクタ。アロケータを<a class="cpprefjp-defined-word" data-desc="デフォルト初期化。`T x;`構文での初期化。トリビアルにデフォルト構築可能な型の場合は初期化されず（オブジェクトのlifetimeは開始される）、そうではないクラス型はデフォルトコンストラクタで初期化する。配列型の場合は各要素が再帰的にデフォルト初期化される">デフォルト構築</a>して、空の<code>hive</code>を構築する。</li>
<li>(2) : アロケータを指定して、空の<code>hive</code>を構築する。</li>
<li>(3) : 要素ブロックの容量制限を指定して、空の<code>hive</code>を構築する。</li>
<li>(4) : 要素ブロックの容量制限とアロケータを指定して、空の<code>hive</code>を構築する。</li>
<li>(5) : <code>n</code>個のデフォルト挿入された要素を保持する<code>hive</code>を構築する。</li>
<li>(6) : (5)に加えて、要素ブロックの容量制限を指定する。</li>
<li>(7) : <code>value</code>のコピーを<code>n</code>個要素として保持する<code>hive</code>を構築する。</li>
<li>(8) : (7)に加えて、要素ブロックの容量制限を指定する。</li>
<li>(9) : <a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a><code>[first, last)</code>を要素としてコピーした<code>hive</code>を構築する。</li>
<li>(10) : (9)に加えて、要素ブロックの容量制限を指定する。</li>
<li>(11) : Range<code>rg</code>の要素で<code>hive</code>を構築する。</li>
<li>(12) : (11)に加えて、要素ブロックの容量制限を指定する。</li>
<li>(13) : コピーコンストラクタ。<code>x</code>と同じ要素を保持する<code>hive</code>を構築する。</li>
<li>(14) : ムーブコンストラクタ。<code>x</code>の指す先を自分の領域として<code>hive</code>を構築する。</li>
<li>(15) : アロケータを指定したコピーコンストラクタ。</li>
<li>(16) : アロケータを指定したムーブコンストラクタ。</li>
<li>(17) : 初期化子リストを受け取るコンストラクタ。<code>il</code>の要素で<code>hive</code>を構築する。</li>
<li>(18) : (17)に加えて、要素ブロックの容量制限を指定する。</li>
</ul>
<p><code><a href="../hive_limits.html">hive_limits</a></code>を受け取る<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> ((3), (4), (6), (8), (10), (12), (18)) は、指定した容量制限で説明専用メンバ<em>current-limits</em>を初期化する。<code>block_limits</code>がハード制限 (<code><a href="block_capacity_hard_limits.html">block_capacity_hard_limits</a></code>) の範囲外であるか、<code>block_limits.min > block_limits.max</code>である場合、その動作は<a class="cpprefjp-defined-word" data-desc="エラー性の動作。未定義動作ではないが、誤ったプログラムの結果とされる動作。erroneous behavior (EB)。処理系によって診断や異常終了を実行することが許可されるが、処理が続行する場合もある" href="../../../implementation-compliance.html#dfn-erroneous-behavior">エラー性動作</a> (erroneous behavior) であり、効果は<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../../implementation-compliance.html#dfn-implementation-defined-behavior">処理系定義</a>である。</p>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Preconditions。関数呼び出し時に満たされていると関数が想定する条件。満たさなければ未定義の動作。契約属性の`[[expects]]`に相当">事前条件</a></h2>
<ul>
<li>(5), (6) : 型<code>T</code>が<code>hive</code>に対して<code>DefaultInsertable</code>であること。</li>
<li>(7), (8), (13), (15), (17), (18) : 型<code>T</code>が<code>hive</code>に対して<code>CopyInsertable</code>であること。</li>
<li>(16) : <code>allocator_traits<Allocator>::is_always_equal::value</code>が<code>false</code>である場合、型<code>T</code>が<code>hive</code>に対して<code>MoveInsertable</code>であること。</li>
</ul>
<h2>効果</h2>
<ul>
<li>(14), (16) (<code>alloc == x.get_allocator()</code>が<code>true</code>の場合) : <code>x</code>の各要素ブロックを<code>*this</code>へ移動する。<code>x</code>の要素を指すポインタ・参照は、<code>*this</code>のメンバとなった同じ要素を指し続ける。<code>x</code>の要素を指すイテレータは、それらの要素を指し続けるが、<code>*this</code>のイテレータとして振る舞う。</li>
<li>(16) (<code>alloc == x.get_allocator()</code>が<code>false</code>の場合) : <code>x</code>の各要素を<code>*this</code>へ移動する。<code>x</code>の要素を指す参照・ポインタ・イテレータ、および<code>x</code>の終端イテレータは無効になる。</li>
</ul>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Postconditions。関数を実行後に満たされている条件。契約属性の`[[ensures]]`に相当">事後条件</a></h2>
<ul>
<li>(14), (16) : <code>x.empty() == true</code>となる。<code>*this</code>の要素の相対順序は、呼び出し前の<code>x</code>の要素の相対順序と同じである。</li>
</ul>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Complexity。関数が使うアルゴリズムの空間計算量・時間計算量">計算量</a></h2>
<ul>
<li>(1), (2), (3), (4) : 定数時間</li>
<li>(5), (6), (7), (8) : <code>n</code>に対して線形時間</li>
<li>(9), (10) : <code><a href="../../iterator/distance.html">distance</a>(first, last)</code>に対して線形時間</li>
<li>(11), (12) : <code><a href="../../iterator/ranges_distance.html">ranges::distance</a>(rg)</code>に対して線形時間</li>
<li>(13), (15) : <code>x.<a href="size.html">size</a>()</code>に対して線形時間</li>
<li>(14) : 定数時間</li>
<li>(16) : <code>alloc == x.get_allocator()</code>が<code>false</code>であれば<code>x.<a href="size.html">size</a>()</code>に対して線形時間。そうでなければ定数時間</li>
<li>(17), (18) : <code>il.<a href="../../initializer_list/initializer_list/size.html">size</a>()</code>に対して線形時間</li>
</ul>
<h2>備考</h2>
<ul>
<li>(13), (15) : <code>x</code>の<em>current-limits</em>で<code>*this</code>の<em>current-limits</em>を初期化する。</li>
<li>(14), (16) : <code>x</code>の各要素ブロックを移動する場合、<em>current-limits</em>は<code>x</code>のものに設定される。</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="763e97b5a7fbf8da5a1e286cc32256c4059e7d04"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../hive.html"><hive></a></span>
<span class="cp">#include <a href="../../iterator.html"><iterator></a></span>
<span class="cp">#include <a href="../../print.html"><print></a></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">// デフォルト構築</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::hive</span></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">h1</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// n個の値を保持する</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::hive</span></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">h2</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// イテレータ範囲から構築</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">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">};</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::hive</span></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">h3</span><span class="p">(</span><span class="n"><a href="../../iterator/begin.html">std::begin</a></span><span class="p">(</span><span class="n">a</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../../iterator/end.html">std::end</a></span><span class="p">(</span><span class="n">a</span><span class="p">));</span>
<span class="w"> </span><span class="c1">// 初期化子リストから構築</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::hive</span></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">h4</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">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// コピー構築</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::hive</span></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">h5</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">h4</span><span class="p">;</span>
<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"<a href="size.html">h1.size()</a> = {}"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="size.html">h1.size()</a></span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"<a href="size.html">h2.size()</a> = {}"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="size.html">h2.size()</a></span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"<a href="size.html">h3.size()</a> = {}"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="size.html">h3.size()</a></span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"<a href="size.html">h4.size()</a> = {}"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="size.html">h4.size()</a></span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"<a href="size.html">h5.size()</a> = {}"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="size.html">h5.size()</a></span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>h1.size() = 0
h2.size() = 3
h3.size() = 3
h4.size() = 3
h5.size() = 3
</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>: 22 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
<li><a href="../../../implementation.html#gcc">GCC</a>: 16.1 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: 2026 Update 2 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="assign.html">assign</a></code></li>
<li><code><a href="assign_range.html">assign_range</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p0447r28.html" target="_blank">P0447R28 Introduction of <code>std::hive</code> to the standard library</a><ul>
<li>C++26で追加された</li>
</ul>
</li>
<li><a href="https://cplusplus.github.io/LWG/issue4554" target="_blank">LWG Issue 4554. Remove undefined behaviour from <code>hive</code> for invalid limits</a><ul>
<li>C++26で、不正な容量制限に対する動作が<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>から<a class="cpprefjp-defined-word" data-desc="エラー性の動作。未定義動作ではないが、誤ったプログラムの結果とされる動作。erroneous behavior (EB)。処理系によって診断や異常終了を実行することが許可されるが、処理が続行する場合もある" href="../../../implementation-compliance.html#dfn-erroneous-behavior">エラー性動作</a>（効果は<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../../implementation-compliance.html#dfn-implementation-defined-behavior">処理系定義</a>）に変更され、事前検証用の静的メンバ関数<code>is_within_hard_limits</code>が追加された</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 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>