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gen/pull/1554/PREVIEW.md

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# PR [\#1554](https://github.com/cpprefjp/site/pull/1554) プレビュー
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- ⌚ 更新時刻: 2026-01-08 21:25:34 JST
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- ⌚ 更新時刻: 2026-01-08 21:30:01 JST
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- 🔍 [プレビュー (HTML)](https://cpprefjp.github.io/site/gen/pull/1554)
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- 📈 [プレビュー生成記録](https://github.com/cpprefjp/site/actions?query=event%3Apull_request_target+branch%3Aiso-c)
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- **⫯** ソースの変更: [`542d90b..39c7b70`](https://github.com/cpprefjp/site/compare/542d90ba4fbe24a28f662ef04b61d573a0524527..39c7b70654e290f1bf3ab0e6fe12f2664c8fa086)
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- **⫯** ソースの変更: [`542d90b..8fc3021`](https://github.com/cpprefjp/site/compare/542d90ba4fbe24a28f662ef04b61d573a0524527..8fc30213cfb5efea3997ff0f2ac09d8c2529766e)
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## 変更記事一覧 (49件)
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## 変更記事一覧 (2件)
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- 📝 [`implementation-status`](https://cpprefjp.github.io/site/gen/pull/1554/implementation-status.html)
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- 📝 [`international-standard`](https://cpprefjp.github.io/site/gen/pull/1554/international-standard.html)
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- 📝 [`lang/cpp23/update_normative_reference_to_posix`](https://cpprefjp.github.io/site/gen/pull/1554/lang/cpp23/update_normative_reference_to_posix.html)
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- 📝 [`lang/cpp26`](https://cpprefjp.github.io/site/gen/pull/1554/lang/cpp26.html)
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- 📝 [`reference/chrono/duration_aliases`](https://cpprefjp.github.io/site/gen/pull/1554/reference/chrono/duration_aliases.html)
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- 📝 [`reference/chrono/gps_time`](https://cpprefjp.github.io/site/gen/pull/1554/reference/chrono/gps_time.html)
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- 📝 [`reference/chrono/local_time`](https://cpprefjp.github.io/site/gen/pull/1554/reference/chrono/local_time.html)
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- 📝 [`reference/chrono/sys_time`](https://cpprefjp.github.io/site/gen/pull/1554/reference/chrono/sys_time.html)
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- 📝 [`reference/chrono/tai_time`](https://cpprefjp.github.io/site/gen/pull/1554/reference/chrono/tai_time.html)
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- 📝 [`reference/chrono/utc_time`](https://cpprefjp.github.io/site/gen/pull/1554/reference/chrono/utc_time.html)
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- 📝 [`reference/format/basic_format_args`](https://cpprefjp.github.io/site/gen/pull/1554/reference/format/basic_format_args.html)
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- 📝 [`reference/format/basic_format_context`](https://cpprefjp.github.io/site/gen/pull/1554/reference/format/basic_format_context.html)
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- 📝 [`reference/format/basic_format_parse_context`](https://cpprefjp.github.io/site/gen/pull/1554/reference/format/basic_format_parse_context.html)
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- 📝 [`reference/format/basic_format_string`](https://cpprefjp.github.io/site/gen/pull/1554/reference/format/basic_format_string.html)
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- 📝 [`reference/fstream/basic_filebuf`](https://cpprefjp.github.io/site/gen/pull/1554/reference/fstream/basic_filebuf.html)
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- 📝 [`reference/fstream/basic_fstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/fstream/basic_fstream.html)
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- 📝 [`reference/fstream/basic_ifstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/fstream/basic_ifstream.html)
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- 📝 [`reference/fstream/basic_ofstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/fstream/basic_ofstream.html)
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- 📝 [`reference/ios/basic_ios`](https://cpprefjp.github.io/site/gen/pull/1554/reference/ios/basic_ios.html)
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- 📝 [`reference/mdspan/extents`](https://cpprefjp.github.io/site/gen/pull/1554/reference/mdspan/extents.html)
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- 📝 [`reference/ostream/basic_ostream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/ostream/basic_ostream.html)
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- 📝 [`reference/ranges/adjacent_view`](https://cpprefjp.github.io/site/gen/pull/1554/reference/ranges/adjacent_view.html)
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- 📝 [`reference/ranges/basic_istream_view`](https://cpprefjp.github.io/site/gen/pull/1554/reference/ranges/basic_istream_view.html)
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- 📝 [`reference/ranges/elements_view`](https://cpprefjp.github.io/site/gen/pull/1554/reference/ranges/elements_view.html)
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- 📝 [`reference/ratio/si_prefix`](https://cpprefjp.github.io/site/gen/pull/1554/reference/ratio/si_prefix.html)
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- 📝 [`reference/regex/basic_regex`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/basic_regex.html)
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- 📝 [`reference/regex/match_results`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/match_results.html)
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- 📝 [`reference/regex/regex_constants/error_type`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/regex_constants/error_type.html)
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- 📝 [`reference/regex/regex_constants/match_flag_type`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/regex_constants/match_flag_type.html)
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- 📝 [`reference/regex/regex_constants/syntax_option_type`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/regex_constants/syntax_option_type.html)
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- 📝 [`reference/regex/regex_iterator`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/regex_iterator.html)
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- 📝 [`reference/regex/regex_token_iterator`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/regex_token_iterator.html)
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- 📝 [`reference/regex/sub_match`](https://cpprefjp.github.io/site/gen/pull/1554/reference/regex/sub_match.html)
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- 📝 [`reference/semaphore/counting_semaphore`](https://cpprefjp.github.io/site/gen/pull/1554/reference/semaphore/counting_semaphore.html)
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- 📝 [`reference/spanstream/basic_ispanstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/spanstream/basic_ispanstream.html)
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- 📝 [`reference/spanstream/basic_ospanstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/spanstream/basic_ospanstream.html)
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- 📝 [`reference/spanstream/basic_spanbuf`](https://cpprefjp.github.io/site/gen/pull/1554/reference/spanstream/basic_spanbuf.html)
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- 📝 [`reference/spanstream/basic_spanstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/spanstream/basic_spanstream.html)
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- 📝 [`reference/sstream/basic_istringstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/sstream/basic_istringstream.html)
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- 📝 [`reference/sstream/basic_ostringstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/sstream/basic_ostringstream.html)
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- 📝 [`reference/sstream/basic_stringbuf`](https://cpprefjp.github.io/site/gen/pull/1554/reference/sstream/basic_stringbuf.html)
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- 📝 [`reference/sstream/basic_stringstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/sstream/basic_stringstream.html)
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- 📝 [`reference/stacktrace/basic_stacktrace`](https://cpprefjp.github.io/site/gen/pull/1554/reference/stacktrace/basic_stacktrace.html)
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- 📝 [`reference/streambuf/basic_streambuf`](https://cpprefjp.github.io/site/gen/pull/1554/reference/streambuf/basic_streambuf.html)
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- 📝 [`reference/string/basic_string`](https://cpprefjp.github.io/site/gen/pull/1554/reference/string/basic_string.html)
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- 📝 [`reference/string_view/basic_string_view`](https://cpprefjp.github.io/site/gen/pull/1554/reference/string_view/basic_string_view.html)
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- 📝 [`reference/syncstream/basic_osyncstream`](https://cpprefjp.github.io/site/gen/pull/1554/reference/syncstream/basic_osyncstream.html)
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- 📝 [`reference/syncstream/basic_syncbuf`](https://cpprefjp.github.io/site/gen/pull/1554/reference/syncstream/basic_syncbuf.html)
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- 📝 [`start_editing/class_template_page`](https://cpprefjp.github.io/site/gen/pull/1554/start_editing/class_template_page.html)

gen/pull/1554/implementation-status.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="2025-12-26T13:23:18">
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2025年12月26日 13時23分18秒
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<span itemprop="datePublished" content="2026-01-08T03:33:22">
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2026年01月08日 03時33分22秒
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</span>
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<td></td>
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<tr>
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<td>P2786R13: <span href="https://cpprefjp.github.io/lang/cpp26/trivial_relocatability.md.nolink">トリビアルな再配置</span></td>
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<td>ムーブ構築と破棄のためにビット単位のコピーとデストラクタ評価が必要になる型のオブジェクトを再配置するメカニズムを導入する</td>
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<td></td>
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<td></td>
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<td>P1967R14: <a href="lang/cpp26/embed.html">ファイルを読み込む<code>#embed</code>命令を追加</a></td>
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<td>バイナリファイルをインクルードするメカニズム。<code>#include</code>とちがって読み出しサイズなどの柔軟な指定ができる</td>
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<td></td>
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<tr>
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<td>P3868R1: <span href="https://cpprefjp.github.io/lang/cpp26/allow_line_before_module_declarations.md.nolink">モジュール宣言より前での<code>#line</code>ディレクティブの使用を許可する</span></td>
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<td>モジュール宣言より前での<code>#line</code>ディレクティブの使用を禁止していたのは過度な制限だった</td>
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<td></td>
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<p>各処理系のC++26実装状況ページ:</p>

gen/pull/1554/international-standard.html

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<td align="left"><a href="lang/cpp26.html">C++26</a> (C++2c)</td>
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<td align="left">N5014(<a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/n5014.pdf" target="_blank">PDF</a>/<a href="https://timsong-cpp.github.io/cppwp/" target="_blank">HTML</a>)</td>
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<td align="left">N5014 N5008 N5001 N4993<br />N4986 N4981 N4971 N4964 N4958</td>
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<td align="left">N5032(<a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/n5032.pdf" target="_blank">PDF</a>/<a href="https://timsong-cpp.github.io/cppwp/" target="_blank">HTML</a>)</td>
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<td align="left">N5032 N5014 N5008 N5001 N4993<br />N4986 N4981 N4971 N4964 N4958</td>
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<td align="left">--</td>
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<td align="left">C23, POSIX.1-2017<br />Unicode 15.1</td>
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gen/pull/1554/lang/cpp26.html

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-11-13T06:41:58">
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2025年11月13日 06時41分58秒
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<span itemprop="datePublished" content="2026-01-08T03:33:22">
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<td><span href="https://cpprefjp.github.io/lang/cpp26/trivial_unions.md.nolink">共用体をトリビアルに未初期化できるようにする</span></td>
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<td><span href="https://cpprefjp.github.io/lang/cpp26/trivial_relocatability.md.nolink">トリビアルな再配置</span></td>
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<td>ムーブ構築と破棄のためにビット単位のコピーとデストラクタ評価が必要になる型のオブジェクトを再配置するメカニズムを導入する</td>
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<h3>属性</h3>
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<td><span href="https://cpprefjp.github.io/lang/cpp26/allow_attaching_main_to_the_global_module.md.nolink"><code>main</code>関数をグローバルモジュールに含められるようにする</span></td>
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<td><code>main</code>関数に<code>extern "C++"</code>を指定できるようにすることで名前付きモジュールに含められるようにする</td>
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<tr>
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<td><span href="https://cpprefjp.github.io/lang/cpp26/allow_line_before_module_declarations.md.nolink">モジュール宣言より前での<code>#line</code>ディレクティブの使用を許可する</span></td>
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<td>モジュール宣言より前での<code>#line</code>ディレクティブの使用を禁止していたのは過度な制限だった</td>
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<h3>機能の非推奨化</h3>

gen/pull/1554/reference/chrono/duration_aliases.html

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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,chrono,std::chrono,type-alias,cpp11
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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,chrono,std::chrono,type-alias,cpp11,nanoseconds,microseconds,milliseconds,seconds,minutes,hours,days,weeks,years,months
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<meta name="title" content="時間間隔を表す型 - cpprefjp C++日本語リファレンス" />
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;chrono&#34;], &#34;namespace&#34;: [&#34;std::chrono&#34;], &#34;id-type&#34;: [&#34;type-alias&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;275dc52ec6a4578bdf550aab0eb0dbc3aa5b8978&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;chrono&gt;\n\nnamespace chrono = std::chrono;\n\nint main()\n{\n chrono::seconds s1{30};\n chrono::seconds s2{20};\n\n // \u79d2\u540c\u58eb\u306e\u6f14\u7b97\n // 30\u79d2 + 20\u79d2 = 50\u79d2\n chrono::seconds result = s1 + s2;\n std::cout &lt;&lt; result.count() &lt;&lt; std::endl;\n\n // \u79d2\u304b\u3089\u30df\u30ea\u79d2\u306b\u5909\u63db\n // 50\u79d2 = 50000\u30df\u30ea\u79d2\n chrono::milliseconds ms = result;\n std::cout &lt;&lt; ms.count() &lt;&lt; std::endl;\n\n // \u79d2\u304b\u3089\u5206\u306b\u5909\u63db\n // 65\u79d2\u306f1\u52065\u79d2\u3060\u304c\u3001\u6574\u6570\u8868\u73fe\u306e\u5206\u306b\u5909\u63db\u3059\u308b\u969b\u306b5\u79d2\u304c\u5207\u308a\u6368\u3066\u3089\u308c\u308b\u305f\u3081\u3001\n // 1\u5206\u3068\u306a\u308b\u3002\n // \u5207\u308a\u6368\u3066\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u306b\u306f\u3001duration_cast()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3002\n chrono::seconds s3{65};\n chrono::minutes m = chrono::duration_cast&lt;chrono::minutes&gt;(s3);\n std::cout &lt;&lt; m.count() &lt;&lt; std::endl;\n}\n&#34;}, {&#34;id&#34;: &#34;34f0bdfcfe66e6cd3eb2c51938a4992a1ec9ff19&#34;, &#34;source&#34;: &#34;#include &lt;cassert&gt;\n#include &lt;chrono&gt;\n\nusing namespace std::chrono;\n\nint main()\n{\n // \u5e74\u304b\u3089\u6708\u3078\u306e\u5909\u63db\u3002duration_cast\u306f\u4e0d\u8981\n months m1 = years{3};\n assert(m1.count() == 36);\n\n // \u6708\u304b\u3089\u5e74\u3078\u306e\u5909\u63db\u3002duration_cast\u304c\u5fc5\u8981\n months m2{37};\n auto y2 = duration_cast&lt;years&gt;(m2);\n assert(y2.count() == 3);\n\n // \u5e74\u304b\u3089\u65e5\u3078\u306e\u5909\u63db\u3002\n // 400\u5e74\u306e\u5e73\u5747\u7684\u306a\u65e5\u6570\u3068\u3057\u3066\u5e74\u304c\u5b9a\u7fa9\u3055\u308c\u308b\u305f\u3081\u3001\u65e5\u306b\u5909\u63db\u3059\u308b\u969b\u306b\u7aef\u6570\u304c\u767a\u751f\u3059\u308b\u3002\n // \u305d\u306e\u305f\u3081\u3001duration_cast\u304c\u5fc5\u8981\n days d3 = duration_cast&lt;days&gt;(years{1});\n assert(d3.count() == 365);\n\n // \u65e5\u304b\u3089\u5e74\u3078\u306e\u5909\u63db\u3002\u7aef\u6570\u304c\u767a\u751f\u3059\u308b\u305f\u3081\u3001duration_cast\u304c\u5fc5\u8981\n auto y4 = duration_cast&lt;years&gt;(days{366});\n assert(y4.count() == 1);\n\n // \u9031\u304b\u3089\u6708\u3078\u306e\u5909\u63db\u3002\u7aef\u6570\u304c\u767a\u751f\u3059\u308b\u305f\u3081\u3001duration_cast\u304c\u5fc5\u8981\n auto w5 = duration_cast&lt;weeks&gt;(months{1});\n assert(w5.count() == 4);\n\n // \u5e74\u304b\u3089\u9031\u3078\u306e\u5909\u63db\u3002duration_cast\u304c\u5fc5\u8981\n auto w6 = duration_cast&lt;weeks&gt;(years{1});\n assert(w6.count() == 52);\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;chrono&#34;, &#34;duration_aliases&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;chrono&#34;], &#34;namespace&#34;: [&#34;std::chrono&#34;], &#34;id-type&#34;: [&#34;type-alias&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;], &#34;alias&#34;: [&#34;nanoseconds,microseconds,milliseconds,seconds,minutes,hours,days,weeks,years,months&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;275dc52ec6a4578bdf550aab0eb0dbc3aa5b8978&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;chrono&gt;\n\nnamespace chrono = std::chrono;\n\nint main()\n{\n chrono::seconds s1{30};\n chrono::seconds s2{20};\n\n // \u79d2\u540c\u58eb\u306e\u6f14\u7b97\n // 30\u79d2 + 20\u79d2 = 50\u79d2\n chrono::seconds result = s1 + s2;\n std::cout &lt;&lt; result.count() &lt;&lt; std::endl;\n\n // \u79d2\u304b\u3089\u30df\u30ea\u79d2\u306b\u5909\u63db\n // 50\u79d2 = 50000\u30df\u30ea\u79d2\n chrono::milliseconds ms = result;\n std::cout &lt;&lt; ms.count() &lt;&lt; std::endl;\n\n // \u79d2\u304b\u3089\u5206\u306b\u5909\u63db\n // 65\u79d2\u306f1\u52065\u79d2\u3060\u304c\u3001\u6574\u6570\u8868\u73fe\u306e\u5206\u306b\u5909\u63db\u3059\u308b\u969b\u306b5\u79d2\u304c\u5207\u308a\u6368\u3066\u3089\u308c\u308b\u305f\u3081\u3001\n // 1\u5206\u3068\u306a\u308b\u3002\n // \u5207\u308a\u6368\u3066\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u306b\u306f\u3001duration_cast()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3002\n chrono::seconds s3{65};\n chrono::minutes m = chrono::duration_cast&lt;chrono::minutes&gt;(s3);\n std::cout &lt;&lt; m.count() &lt;&lt; std::endl;\n}\n&#34;}, {&#34;id&#34;: &#34;34f0bdfcfe66e6cd3eb2c51938a4992a1ec9ff19&#34;, &#34;source&#34;: &#34;#include &lt;cassert&gt;\n#include &lt;chrono&gt;\n\nusing namespace std::chrono;\n\nint main()\n{\n // \u5e74\u304b\u3089\u6708\u3078\u306e\u5909\u63db\u3002duration_cast\u306f\u4e0d\u8981\n months m1 = years{3};\n assert(m1.count() == 36);\n\n // \u6708\u304b\u3089\u5e74\u3078\u306e\u5909\u63db\u3002duration_cast\u304c\u5fc5\u8981\n months m2{37};\n auto y2 = duration_cast&lt;years&gt;(m2);\n assert(y2.count() == 3);\n\n // \u5e74\u304b\u3089\u65e5\u3078\u306e\u5909\u63db\u3002\n // 400\u5e74\u306e\u5e73\u5747\u7684\u306a\u65e5\u6570\u3068\u3057\u3066\u5e74\u304c\u5b9a\u7fa9\u3055\u308c\u308b\u305f\u3081\u3001\u65e5\u306b\u5909\u63db\u3059\u308b\u969b\u306b\u7aef\u6570\u304c\u767a\u751f\u3059\u308b\u3002\n // \u305d\u306e\u305f\u3081\u3001duration_cast\u304c\u5fc5\u8981\n days d3 = duration_cast&lt;days&gt;(years{1});\n assert(d3.count() == 365);\n\n // \u65e5\u304b\u3089\u5e74\u3078\u306e\u5909\u63db\u3002\u7aef\u6570\u304c\u767a\u751f\u3059\u308b\u305f\u3081\u3001duration_cast\u304c\u5fc5\u8981\n auto y4 = duration_cast&lt;years&gt;(days{366});\n assert(y4.count() == 1);\n\n // \u9031\u304b\u3089\u6708\u3078\u306e\u5909\u63db\u3002\u7aef\u6570\u304c\u767a\u751f\u3059\u308b\u305f\u3081\u3001duration_cast\u304c\u5fc5\u8981\n auto w5 = duration_cast&lt;weeks&gt;(months{1});\n assert(w5.count() == 4);\n\n // \u5e74\u304b\u3089\u9031\u3078\u306e\u5909\u63db\u3002duration_cast\u304c\u5fc5\u8981\n auto w6 = duration_cast&lt;weeks&gt;(years{1});\n assert(w6.count() == 52);\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;chrono&#34;, &#34;duration_aliases&#34;]}">
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@@ -188,12 +188,12 @@
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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="2025-07-11T17:16:44">
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2025年07月11日 17時16分44秒
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<span itemprop="datePublished" content="2026-01-08T10:50:33">
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2026年01月08日 10時50分33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">Koichi Murase</span>
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<span itemprop="name">yoh</span>
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が更新
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