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‎lang/cpp26.html‎

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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2026-03-12T02:15:34">
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2026年03月12日 02時15分34秒
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<span itemprop="datePublished" content="2026-03-24T04:23:43">
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<h2>ライブラリ更新の概要</h2>
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<h3>新ライブラリ</h3>
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<ul>
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<li>文字列エンコーディングを識別するライブラリとして、<code><span href="https://cpprefjp.github.io/reference/text_encoding.md.nolink">&lt;text_encoding&gt;</span></code>を追加</li>
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<li>文字列エンコーディングを識別するライブラリとして、<code><a href="../reference/text_encoding.html">&lt;text_encoding&gt;</a></code>を追加</li>
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<li>要素のメモリ位置が安定するシーケンスコンテナのライブラリとして<code><span href="https://cpprefjp.github.io/reference/hive.md.nolink">&lt;hive&gt;</span></code>を追加</li>
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<li>並行処理におけるデータの参照・更新を行うRCU (Read Copy Update) のライブラリとして、<code><a href="../reference/rcu.html">&lt;rcu&gt;</a></code>を追加</li>
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<li>並行処理において参照中のデータが更新されないよう保護するハザードポインタのライブラリとして、<code><span href="https://cpprefjp.github.io/reference/hazard_pointer.md.nolink">&lt;hazard_pointer&gt;</span></code>を追加</li>

‎lang/cpp26/feature_test_macros.html‎

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最終更新日時(UTC):
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2026年02月25日 04時06分35秒
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<span itemprop="datePublished" content="2026-03-24T04:23:43">
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<td><code>__cpp_lib_text_encoding</code></td>
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<td><code>202306L</code></td>
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<td>文字列エンコーディングを識別するライブラリ<code><span href="https://cpprefjp.github.io/reference/text_encoding.md.nolink">&lt;text_encoding&gt;</span></code>を追加</td>
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<td><code><span href="https://cpprefjp.github.io/reference/text_encoding.md.nolink">&lt;text_encoding&gt;</span></code></td>
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<td>文字列エンコーディングを識別するライブラリ<code><a href="../../reference/text_encoding.html">&lt;text_encoding&gt;</a></code>を追加</td>
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<td><code><a href="../../reference/text_encoding.html">&lt;text_encoding&gt;</a></code></td>
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<td><code>__cpp_lib_to_chars</code></td>

‎reference.html‎

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2026年01月18日 09時49分27秒
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<span itemprop="datePublished" content="2026-03-24T04:23:43">
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</span>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">K10-K10</span>
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<span itemprop="name">Akira Takahashi</span>
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</span>
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が更新
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</small></p>
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<td><code><span href="https://cpprefjp.github.io/reference/text_encoding.md.nolink">&lt;text_encoding&gt;</span></code></td>
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<td><code><a href="reference/text_encoding.html">&lt;text_encoding&gt;</a></code></td>
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<td>文字列エンコーディングの識別</td>
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<td>C++26</td>
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‎reference/locale/locale.html‎

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<span itemprop="datePublished" content="2026-03-24T04:23:43">
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<td>名前の取得</td>
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<td><code><a href="locale/encoding.html">encoding</a></code></td>
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<td>エンコーディングの取得 (C++26)</td>
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</tr>
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<tr>
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<td><code><a href="locale/op_equal.html">operator==</a></code></td>
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‎reference/locale/locale/encoding.html‎

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;locale&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;class&#34;: [&#34;locale&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp26&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;7bd3c02c74429483034bf10cf1b972979efb6306&#34;, &#34;source&#34;: &#34;#include &lt;locale&gt;\n#include &lt;text_encoding&gt;\n#include &lt;print&gt;\n\nint main() {\n // \u30c7\u30d5\u30a9\u30eb\u30c8\uff08\&#34;C\&#34;\uff09\u30ed\u30b1\u30fc\u30eb\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\n std::locale c_loc;\n std::println(\&#34;C locale encoding: {}\&#34;, c_loc.encoding().name());\n\n // \u74b0\u5883\u30ed\u30b1\u30fc\u30eb\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\n std::locale env_loc(\&#34;\&#34;);\n std::println(\&#34;Environment locale encoding: {}\&#34;, env_loc.encoding().name());\n\n // \u74b0\u5883\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u306e\u6bd4\u8f03\n if (env_loc.encoding() == std::text_encoding::environment()) {\n std::println(\&#34;Locale encoding matches environment encoding\&#34;);\n }\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;locale&#34;, &#34;locale&#34;, &#34;encoding&#34;]}">
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<span>
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<span itemprop="name">locale::encoding</span>
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</span>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2026-03-24T04:23:43">
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2026年03月24日 04時23分43秒
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</span>
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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">Akira Takahashi</span>
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</span>
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が更新
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</small></p>
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<p class="text-right">
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<a class="history" target="_blank" href="https://github.com/cpprefjp/site/commits/master/reference/locale/locale/encoding.md">
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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</a>
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<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/locale/locale/encoding.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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</a>
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<div class="row">
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<div class="col-sm-12 content-body">
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<div class="identifier-type">function</div><div class="header">&lt;locale&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class locale">locale::</span><span class="token">locale::encoding</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="n"><a href="../../text_encoding/text_encoding.html">text_encoding</a></span><span class="w"> </span><span class="nf">encoding</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="p">;</span><span class="w"> </span><span class="c1">// (1) C++26</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p>ロケールに関連付けられたエンコーディングを取得する。</p>
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<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。Mandates。満たさなければプログラムが不適格となる要件。この要件は、オーバーロード解決によって選択された関数内での`static_assert`の定数条件式や、関数に対するdelete宣言などで表現できる">適格要件</a></h2>
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<ul>
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<li><code>CHAR_BIT == 8</code>であること</li>
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</ul>
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<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>
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<p><code>*this</code>に関連付けられた<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">実装定義</a>のエンコーディングスキームを表す<code><a href="../../text_encoding/text_encoding.html">std::text_encoding</a></code>オブジェクトを返す。</p>
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<h2>例</h2>
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<p><div class="yata" id="7bd3c02c74429483034bf10cf1b972979efb6306"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../locale.html">&lt;locale&gt;</a></span>
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<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;text_encoding&gt;</span>
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<span class="cp">#include <a href="../../print.html">&lt;print&gt;</a></span>
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<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="c1">// デフォルト（"C"）ロケールのエンコーディング</span>
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<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">locale</span><span class="w"> </span><span class="n">c_loc</span><span class="p">;</span>
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<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"C locale encoding: {}"</span><span class="p">,</span><span class="w"> </span><span class="n">c_loc</span><span class="p">.</span><span class="n">encoding</span><span class="p">().</span><span class="n">name</span><span class="p">());</span>
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<span class="w"> </span><span class="c1">// 環境ロケールのエンコーディング</span>
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<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">locale</span><span class="w"> </span><span class="n">env_loc</span><span class="p">(</span><span class="s">""</span><span class="p">);</span>
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<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"Environment locale encoding: {}"</span><span class="p">,</span><span class="w"> </span><span class="n">env_loc</span><span class="p">.</span><span class="n">encoding</span><span class="p">().</span><span class="n">name</span><span class="p">());</span>
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<span class="w"> </span><span class="c1">// 環境エンコーディングとの比較</span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">env_loc</span><span class="p">.</span><span class="n">encoding</span><span class="p">()</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">text_encoding</span><span class="o">::</span><span class="n">environment</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"Locale encoding matches environment encoding"</span><span class="p">);</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>出力例</h3>
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<p><pre><code>C locale encoding: US-ASCII
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Environment locale encoding: UTF-8
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Locale encoding matches environment encoding
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</code></pre></p>
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<h2>バージョン</h2>
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<h3>言語</h3>
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<ul>
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<li>C++26</li>
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</ul>
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<h3>処理系</h3>
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<ul>
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<li><a href="../../../implementation.html#clang">Clang</a>: ??</li>
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<li><a href="../../../implementation.html#gcc">GCC</a>: 15 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p1885r12.pdf" target="_blank">P1885R12 Naming Text Encodings to Demystify Them</a></li>
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</ul></div>
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の下に提供されています。
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