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‎reference/functional/reference_wrapper/op_deduction_guide.html‎

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<title>std::functional::推論補助 - cpprefjp C++日本語リファレンス</title>
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<title>std::reference_wrapper::推論補助 - cpprefjp C++日本語リファレンス</title>
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C++,標準ライブラリ,リファレンス,ドキュメント,STL,std,functional,std,functional,cpp17
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C++,標準ライブラリ,リファレンス,ドキュメント,STL,std,functional,std,reference_wrapper,cpp17
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<meta name="title" content="std::functional::推論補助 - cpprefjp C++日本語リファレンス" />
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<meta property="og:title" content="std::functional::推論補助 - cpprefjp C++日本語リファレンス" />
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<meta name="title" content="std::reference_wrapper::推論補助 - cpprefjp C++日本語リファレンス" />
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<meta itemprop="name" content="std::reference_wrapper::推論補助 - cpprefjp C++日本語リファレンス" />
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<meta property="og:title" content="std::reference_wrapper::推論補助 - cpprefjp C++日本語リファレンス" />
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<meta property="og:site_name" content="cpprefjp - C++日本語リファレンス" />
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<meta property="og:type" content="article" />
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<meta property="og:description" content="[`std::reference_wrapper`](/reference/functional/reference_wrapper.md)クラステンプレートの型推論補助。左辺値参照から推論する。" />
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<meta name="twitter:card" content="summary" />
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<meta name="twitter:title" content="std::functional::推論補助 - cpprefjp C++日本語リファレンス" />
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<meta name="twitter:title" content="std::reference_wrapper::推論補助 - cpprefjp C++日本語リファレンス" />
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<meta name="twitter:url" content="https://cpprefjp.github.io/reference/functional/reference_wrapper/op_deduction_guide.html" />
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<meta name="twitter:description" content="[`std::reference_wrapper`](/reference/functional/reference_wrapper.md)クラステンプレートの型推論補助。左辺値参照から推論する。" />
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<body>
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;functional&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;class&#34;: [&#34;functional&#34;], &#34;cpp&#34;: [&#34;cpp17&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;ec198998d543d4888a02a74f7895845d90e43eb7&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;functional&gt;\n\nint main()\n{\n int x = 3;\n\n // x\u3078\u306e\u53c2\u7167\u3092\u4fdd\u6301\u3059\u308b\n std::reference_wrapper r(x);\n r.get() += 1;\n std::cout &lt;&lt; x &lt;&lt; std::endl;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;functional&#34;, &#34;reference_wrapper&#34;, &#34;op_deduction_guide&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;functional&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;class&#34;: [&#34;reference_wrapper&#34;], &#34;cpp&#34;: [&#34;cpp17&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;ec198998d543d4888a02a74f7895845d90e43eb7&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;functional&gt;\n\nint main()\n{\n int x = 3;\n\n // x\u3078\u306e\u53c2\u7167\u3092\u4fdd\u6301\u3059\u308b\n std::reference_wrapper r(x);\n r.get() += 1;\n std::cout &lt;&lt; x &lt;&lt; std::endl;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;functional&#34;, &#34;reference_wrapper&#34;, &#34;op_deduction_guide&#34;]}">
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datetime="2026-09-19T21:31:51+09:00">
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2026年09月19日 21時31分51秒 (JST)
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datetime="2026-09-24T10:21:42+09:00">
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2026年09月24日 10時21分42秒 (JST)
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</time>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">rotarymars</span>
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<span itemprop="name">Akira Takahashi</span>
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<div class="row">
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<div class="header">&lt;functional&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class functional">functional::</span><span class="token">推論補助</span><span class="cpp cpp17" title="C++17で追加">(C++17)</span></h1>
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<div class="header">&lt;functional&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class reference_wrapper">reference_wrapper::</span><span class="token">推論補助</span><span class="cpp cpp17" title="C++17で追加">(C++17)</span></h1>
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<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>
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<span class="w"> </span><span class="k">template</span><span class="o">&lt;</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">&gt;</span>
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<span class="w"> </span><span class="n">reference_wrapper</span><span class="p">(</span><span class="n">T</span><span class="o">&amp;</span><span class="p">)</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">reference_wrapper</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="p">;</span>

‎reference/syncstream/basic_osyncstream/rdbuf.html‎

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<title>std::basic_syncbuf::rdbuf - cpprefjp C++日本語リファレンス</title>
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<title>std::basic_osyncstream::rdbuf - cpprefjp C++日本語リファレンス</title>
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C++,標準ライブラリ,リファレンス,ドキュメント,STL,std,syncstream,function,std,basic_osyncstream,cpp20
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<meta name="title" content="std::basic_osyncstream::rdbuf - cpprefjp C++日本語リファレンス" />
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<meta itemprop="name" content="std::basic_osyncstream::rdbuf - cpprefjp C++日本語リファレンス" />
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<meta property="og:description" content="ベースとなる[`std::basic_syncbuf`](../basic_syncbuf.md)へのポインタを返す。" />
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<meta name="twitter:title" content="std::basic_syncbuf::rdbuf - cpprefjp C++日本語リファレンス" />
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<meta name="twitter:description" content="ベースとなる[`std::basic_syncbuf`](../basic_syncbuf.md)へのポインタを返す。" />
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;syncstream&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;class&#34;: [&#34;basic_syncbuf&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;ae7072c10f99b11b6f16d70b1d96fb0850c84a04&#34;, &#34;source&#34;: &#34;#include &lt;syncstream&gt;\n#include &lt;iostream&gt;\n\nint main()\n{\n std::osyncstream bout(std::cout);\n bout &lt;&lt; \&#34;Hello, \&#34;;\n\n auto syncbuf_ptr = bout.rdbuf();\n syncbuf_ptr-&gt;emit(); // \u6587\u5b57\u304c\u8ee2\u9001\u3055\u308c\u308b\n\n bout &lt;&lt; \&#34;World!\&#34; &lt;&lt; &#39;\\n&#39;;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;syncstream&#34;, &#34;basic_osyncstream&#34;, &#34;rdbuf&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;syncstream&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;class&#34;: [&#34;basic_osyncstream&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;ae7072c10f99b11b6f16d70b1d96fb0850c84a04&#34;, &#34;source&#34;: &#34;#include &lt;syncstream&gt;\n#include &lt;iostream&gt;\n\nint main()\n{\n std::osyncstream bout(std::cout);\n bout &lt;&lt; \&#34;Hello, \&#34;;\n\n auto syncbuf_ptr = bout.rdbuf();\n syncbuf_ptr-&gt;emit(); // \u6587\u5b57\u304c\u8ee2\u9001\u3055\u308c\u308b\n\n bout &lt;&lt; \&#34;World!\&#34; &lt;&lt; &#39;\\n&#39;;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;syncstream&#34;, &#34;basic_osyncstream&#34;, &#34;rdbuf&#34;]}">
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<p class="text-right"><small>
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最終更新日時:
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<time itemprop="datePublished" class="js-local-time"
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datetime="2026-08-23T14:20:08+09:00">
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2026年08月23日 14時20分08秒 (JST)
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datetime="2026-09-24T10:21:42+09:00">
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2026年09月24日 10時21分42秒 (JST)
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<div class="identifier-type">function</div><div class="header">&lt;syncstream&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class basic_syncbuf">basic_syncbuf::</span><span class="token">rdbuf</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span></h1>
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<div class="identifier-type">function</div><div class="header">&lt;syncstream&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class basic_osyncstream">basic_osyncstream::</span><span class="token">rdbuf</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="n">syncbuf_type</span><span class="o">*</span><span class="w"> </span><span class="nf">rdbuf</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
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</code></pre></div>
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‎rss.xml‎

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<feed xmlns="http://www.w3.org/2005/Atom">
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<title>cpprefjp - C++日本語リファレンス</title>
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<link href="https://cpprefjp.github.io" />
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<updated>2026-09-23T18:31:41.843598</updated>
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<id>65323eb0-5953-44ac-9df8-e57eb8e8b68b</id>
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<id>a6e4519f-f2bc-4353-9ac6-b0ab5234ca11</id>
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<entry>
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<title>推論補助 -- 所属クラスの指定ミスを修正</title>
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<link href="https://cpprefjp.github.io/reference/functional/reference_wrapper/op_deduction_guide.html"/>
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<id>e03170552907119f55c44de9cc96dd3d0cd78253:reference/functional/reference_wrapper/op_deduction_guide.md</id>
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<updated>2026-09-24T10:21:42+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/functional/reference_wrapper/op_deduction_guide.md b/reference/functional/reference_wrapper/op_deduction_guide.md
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index d8a10a5d8..280fc9ff5 100644
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--- a/reference/functional/reference_wrapper/op_deduction_guide.md
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+++ b/reference/functional/reference_wrapper/op_deduction_guide.md
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@@ -1,7 +1,7 @@
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# 推論補助
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* functional[meta header]
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* std[meta namespace]
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-* functional[meta class]
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+* reference_wrapper[meta class]
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* cpp17[meta cpp]
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```cpp
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&lt;/code&gt;&lt;/pre&gt;</summary>
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<author>
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<name>Akira Takahashi</name>
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<email>[email protected]</email>
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</author>
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</entry>
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<entry>
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<title>rdbuf -- 所属クラスの指定ミスを修正</title>
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<link href="https://cpprefjp.github.io/reference/syncstream/basic_osyncstream/rdbuf.html"/>
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<id>e03170552907119f55c44de9cc96dd3d0cd78253:reference/syncstream/basic_osyncstream/rdbuf.md</id>
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<updated>2026-09-24T10:21:42+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/syncstream/basic_osyncstream/rdbuf.md b/reference/syncstream/basic_osyncstream/rdbuf.md
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index 316bd1b33..15ddb0d89 100644
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--- a/reference/syncstream/basic_osyncstream/rdbuf.md
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+++ b/reference/syncstream/basic_osyncstream/rdbuf.md
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@@ -2,7 +2,7 @@
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* syncstream[meta header]
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* function[meta id-type]
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* std[meta namespace]
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-* basic_syncbuf[meta class]
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+* basic_osyncstream[meta class]
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* cpp20[meta cpp]
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&lt;/code&gt;&lt;/pre&gt;</summary>
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<author>
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<name>Akira Takahashi</name>
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<email>[email protected]</email>
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</author>
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</entry>
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<entry>
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<title>デストラクタ -- bad_optional_access のデストラクタ : 概要がbad_array_new_lengthのコピーのままだったのを修正</title>
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<link href="https://cpprefjp.github.io/reference/optional/bad_optional_access/op_destructor.html"/>
@@ -141,49 +195,4 @@ index 8256d705e..3426665b2 100644
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</author>
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</entry>
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<entry>
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<title>コンストラクタ -- basic_string_view のコンストラクタ : (7)の例が終端ヌル文字を含むことが出力から読み取れなかったのを修正</title>
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<link href="https://cpprefjp.github.io/reference/string_view/basic_string_view/op_constructor.html"/>
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<id>35b025c11fa0d1e620168aedc97da747fbf8f891:reference/string_view/basic_string_view/op_constructor.md</id>
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<updated>2026-09-22T22:48:36+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/string_view/basic_string_view/op_constructor.md b/reference/string_view/basic_string_view/op_constructor.md
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index 3277d187b..d2870c886 100644
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--- a/reference/string_view/basic_string_view/op_constructor.md
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+++ b/reference/string_view/basic_string_view/op_constructor.md
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@@ -141,7 +141,8 @@ int main()
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std::vector vec = {&amp;#39;H&amp;#39;, &amp;#39;e&amp;#39;, &amp;#39;l&amp;#39;, &amp;#39;l&amp;#39;, &amp;#39;o&amp;#39;, &amp;#39;\0&amp;#39;, &amp;#39;!&amp;#39;};
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// 参照するのは入力範囲先頭からそのサイズ（`std::ranges::size()`）分
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std::string_view sv{vec};
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- std::cout &amp;lt;&amp;lt; &amp;#34;(7) : &amp;#34; &amp;lt;&amp;lt; sv &amp;lt;&amp;lt; std::endl;
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+ // 終端ヌル文字で止まらないため、sizeは7になる
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+ std::cout &amp;lt;&amp;lt; &amp;#34;(7) : size = &amp;#34; &amp;lt;&amp;lt; sv.size() &amp;lt;&amp;lt; std::endl;
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// explicitのため、このような初期化や暗黙変換は無効
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//std::string_view sv = {vec};
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@@ -149,6 +150,7 @@ int main()
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}
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```
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* s.begin()[link /reference/string/basic_string/begin.md]
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+* sv.size()[link size.md]
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### 出力
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```
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@@ -156,7 +158,7 @@ int main()
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(3) : Hello World
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(5) : Hello
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(6) : Hello
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-(7) : Hello!
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+(7) : size = 7
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```
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## バージョン
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&lt;/code&gt;&lt;/pre&gt;</summary>
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<author>
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<name>rotarymars</name>
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<email>[email protected]</email>
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</author>
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</entry>
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</feed>

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‎static/crsearch/crsearch.js‎

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‎static/crsearch/crsearch.json‎

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