cpprefjp
diff --git a/‎gen/pull/1559/PREVIEW.md‎
Lines changed: 2 additions & 2 deletions b/‎gen/pull/1559/PREVIEW.md‎
Lines changed: 2 additions & 2 deletions
diff --git a/‎gen/pull/1559/reference/cmath/copysign.html‎
Lines changed: 12 additions & 12 deletions b/‎gen/pull/1559/reference/cmath/copysign.html‎
Lines changed: 12 additions & 12 deletions
diff --git a/‎gen/pull/1559/reference/cmath/signbit.html‎
Lines changed: 6 additions & 6 deletions b/‎gen/pull/1559/reference/cmath/signbit.html‎
Lines changed: 6 additions & 6 deletions
@@ -1,8 +1,8 @@
 # PR [\#1559](https://github.com/cpprefjp/site/pull/1559) プレビュー
-- &#x231a; 更新時刻: 2026-01-11 01:28:39 JST
+- &#x231a; 更新時刻: 2026-01-12 09:44:45 JST
 - &#x1f50d; [プレビュー (HTML)](https://cpprefjp.github.io/site/gen/pull/1559)
 - &#x1f4c8; [プレビュー生成記録](https://github.com/cpprefjp/site/actions?query=event%3Apull_request_target+branch%3Afeat%2Fcmath-copysign-signbit)
-- **&#x2AEF;** ソースの変更: [`d39c9aa..6be1b49`](https://github.com/cpprefjp/site/compare/d39c9aa8732432ba0f0161c4efcb9d8ba99c8d65..6be1b49f55f6b67ff5a6e587ec1a8b63bc0ac658)
+- **&#x2AEF;** ソースの変更: [`d39c9aa..fc491d3`](https://github.com/cpprefjp/site/compare/d39c9aa8732432ba0f0161c4efcb9d8ba99c8d65..fc491d3893c4942ac82672c71f36adc8fd86e5ac)
 
 ## 変更記事一覧 (2件)
 
 
@@ -68,7 +68,7 @@
 
     </head>
     <body>
-<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;cmath&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;92b16b2b3feacd8e211b5e484623e33a9b71612f&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;limits&gt;\n\nint main()\n{\n  // \u901a\u5e38\u306e\u6570\u5024\n  std::cout &lt;&lt; \&#34;1.0f,  2.0f : \&#34; &lt;&lt; std::copysign(1.0f, 2.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;0.0f, -2.0f : \&#34; &lt;&lt; std::copysign(0.0f, -2.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;1.5f, -0.0f : \&#34; &lt;&lt; std::copysign(1.5f, -0.0f) &lt;&lt; std::endl;\n\n  // \u7121\u9650\u5927\n  const float inf = std::numeric_limits&lt;float&gt;::infinity();\n  std::cout &lt;&lt; \&#34; inf, -2.0f : \&#34; &lt;&lt; std::copysign(inf, -2.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34; inf,  2.0f : \&#34; &lt;&lt; std::copysign(inf, 2.0f) &lt;&lt; std::endl;\n\n  // NaN (Not a Number)\n  // NaN\u306e\u7b26\u53f7\u3082\u30b3\u30d4\u30fc\u3055\u308c\u308b\u3002\n  const float nan = std::numeric_limits&lt;float&gt;::quiet_NaN();\n  std::cout &lt;&lt; \&#34; nan, -2.0f : \&#34; &lt;&lt; std::copysign(nan, -2.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34; nan,  2.0f : \&#34; &lt;&lt; std::copysign(nan, 2.0f) &lt;&lt; std::endl;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;cmath&#34;, &#34;copysign&#34;]}">
+<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;cmath&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;942914393c52342a76a2ef1c4d4abf437082aba3&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;limits&gt;\n\nint main()\n{\n  // \u901a\u5e38\u306e\u6570\u5024\n  std::cout &lt;&lt; \&#34;1.0f,  2.0f : \&#34; &lt;&lt; std::copysign(1.0f, 2.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;0.0f, -2.0f : \&#34; &lt;&lt; std::copysign(0.0f, -2.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;1.5f, -0.0f : \&#34; &lt;&lt; std::copysign(1.5f, -0.0f) &lt;&lt; std::endl;\n\n  // \u7121\u9650\u5927\n  const float inf = std::numeric_limits&lt;float&gt;::infinity();\n  std::cout &lt;&lt; \&#34;-inf,  3.0f : \&#34; &lt;&lt; std::copysign(-inf, 3.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;3.0f,  -inf : \&#34; &lt;&lt; std::copysign(3.0f, -inf) &lt;&lt; std::endl;\n\n  // NaN (Not a Number)\n  // NaN\u306e\u7b26\u53f7\u3082\u30b3\u30d4\u30fc\u3055\u308c\u308b\u3002\n  const float nan = std::numeric_limits&lt;float&gt;::quiet_NaN();\n  std::cout &lt;&lt; \&#34; nan, -4.2f : \&#34; &lt;&lt; std::copysign(nan, -4.2f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;4.2f,  -nan : \&#34; &lt;&lt; std::copysign(4.2f, -nan) &lt;&lt; std::endl;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;cmath&#34;, &#34;copysign&#34;]}">
   <nav class="navbar navbar-default" role="navigation">
     <div class="container-fluid">
       <div class="navbar-header">
@@ -188,8 +188,8 @@
 
     <p class="text-right"><small>
       最終更新日時(UTC):
-      <span itemprop="datePublished" content="2026-01-10T16:15:39">
-        2026年01月10日 16時15分39秒
+      <span itemprop="datePublished" content="2026-01-12T00:32:09">
+        2026年01月12日 00時32分09秒
       </span>
       <br/>
       <span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -272,7 +272,7 @@ <h2>備考</h2>
 <li>C++23では、(1), (2), (3)が(4)に統合され、<a class="cpprefjp-defined-word" data-desc="&lt;stdfloat&gt;で定義される内部表現の規定された浮動小数点数型" href="../stdfloat.html">拡張浮動小数点数型</a>を含む浮動小数点数型への<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>として定義された</li>
 </ul>
 <h2>例</h2>
-<p><div class="yata" id="92b16b2b3feacd8e211b5e484623e33a9b71612f"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
+<p><div class="yata" id="942914393c52342a76a2ef1c4d4abf437082aba3"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
 <span class="cp">#include</span> <span class="cpf"><a href="../cmath.html">&lt;cmath&gt;</a></span><span class="cp"></span>
 <span class="cp">#include</span> <span class="cpf"><a href="../limits.html">&lt;limits&gt;</a></span><span class="cp"></span>
 
@@ -285,25 +285,25 @@ <h2>例</h2>
 
   <span class="c1">// 無限大</span>
   <span class="k">const</span> <span class="kt">float</span> <span class="n">inf</span> <span class="o">=</span> <span class="n"><a href="../limits/numeric_limits.html">std::numeric_limits</a></span><span class="o">&lt;</span><span class="kt">float</span><span class="o">&gt;::</span><span class="n"><a href="../limits/numeric_limits/infinity.html">infinity()</a></span><span class="p">;</span>
-  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">" inf, -2.0f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="n">inf</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.0f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
-  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">" inf,  2.0f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="n">inf</span><span class="p">,</span> <span class="mf">2.0f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
+  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"-inf,  3.0f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="o">-</span><span class="n">inf</span><span class="p">,</span> <span class="mf">3.0f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
+  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"3.0f,  -inf : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="mf">3.0f</span><span class="p">,</span> <span class="o">-</span><span class="n">inf</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
 
   <span class="c1">// NaN (Not a Number)</span>
   <span class="c1">// NaNの符号もコピーされる。</span>
   <span class="k">const</span> <span class="kt">float</span> <span class="n">nan</span> <span class="o">=</span> <span class="n"><a href="../limits/numeric_limits.html">std::numeric_limits</a></span><span class="o">&lt;</span><span class="kt">float</span><span class="o">&gt;::</span><span class="n"><a href="../limits/numeric_limits/quiet_nan.html">quiet_NaN()</a></span><span class="p">;</span>
-  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">" nan, -2.0f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="n">nan</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.0f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
-  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">" nan,  2.0f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="n">nan</span><span class="p">,</span> <span class="mf">2.0f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
+  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">" nan, -4.2f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="n">nan</span><span class="p">,</span> <span class="o">-</span><span class="mf">4.2f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
+  <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"4.2f,  -nan : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::copysign</span></span><span class="p">(</span><span class="mf">4.2f</span><span class="p">,</span> <span class="o">-</span><span class="n">nan</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
 <span class="p">}</span>
 </code></pre></div>
 </div></p>
 <h3>出力</h3>
 <p><pre><code>1.0f,  2.0f : 1
 0.0f, -2.0f : -0
 1.5f, -0.0f : -1.5
- inf, -2.0f : -inf
- inf,  2.0f : inf
- nan, -2.0f : -nan
- nan,  2.0f : nan
+-inf,  3.0f : inf
+3.0f,  -inf : -3
+ nan, -4.2f : -nan
+4.2f,  -nan : -4.2
 </code></pre></p>
 <h3>備考</h3>
 <p>特定の環境では、早期に <code>constexpr</code> 対応されている場合がある：</p>
 
@@ -68,7 +68,7 @@
 
     </head>
     <body>
-<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;cmath&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;d675e4a98f51731f3b0dfeec69045e2d65b8ae6c&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;limits&gt;\n\nint main()\n{\n// \u901a\u5e38\u306e\u6570\u5024\n  std::cout &lt;&lt; std::boolalpha;\n  std::cout &lt;&lt; \&#34;-1.0f : \&#34; &lt;&lt; std::signbit(-1.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;-0.0f : \&#34; &lt;&lt; std::signbit(-0.0f) &lt;&lt; std::endl;\n\n  std::cout &lt;&lt; \&#34;1.0f  : \&#34; &lt;&lt; std::signbit(1.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;0.0f  : \&#34; &lt;&lt; std::signbit(0.0f) &lt;&lt; std::endl;\n\n  // \u7121\u9650\u5927\n  const double inf = std::numeric_limits&lt;double&gt;::infinity();\n  std::cout &lt;&lt; \&#34;inf   : \&#34; &lt;&lt; std::signbit(inf) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;-inf  : \&#34; &lt;&lt; std::signbit(-inf) &lt;&lt; std::endl;\n\n  // NaN (Not a Number)\n  // NaN\u306e\u7b26\u53f7\u30d3\u30c3\u30c8\u3082\u691c\u51fa\u3067\u304d\u308b\n  const double nan = std::numeric_limits&lt;double&gt;::quiet_NaN();\n  std::cout &lt;&lt; \&#34;nan   : \&#34; &lt;&lt; std::signbit(nan) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;-nan  : \&#34; &lt;&lt; std::signbit(-nan) &lt;&lt; std::endl;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;cmath&#34;, &#34;signbit&#34;]}">
+<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;cmath&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;b215c742dae70cc54b14462a858c7708eb89227e&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;limits&gt;\n\nint main()\n{\n  // \u901a\u5e38\u306e\u6570\u5024\n  std::cout &lt;&lt; std::boolalpha;\n  std::cout &lt;&lt; \&#34;-1.0f : \&#34; &lt;&lt; std::signbit(-1.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;-0.0f : \&#34; &lt;&lt; std::signbit(-0.0f) &lt;&lt; std::endl;\n\n  std::cout &lt;&lt; \&#34;1.0f  : \&#34; &lt;&lt; std::signbit(1.0f) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;0.0f  : \&#34; &lt;&lt; std::signbit(0.0f) &lt;&lt; std::endl;\n\n  // \u7121\u9650\u5927\n  const double inf = std::numeric_limits&lt;double&gt;::infinity();\n  std::cout &lt;&lt; \&#34;inf   : \&#34; &lt;&lt; std::signbit(inf) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;-inf  : \&#34; &lt;&lt; std::signbit(-inf) &lt;&lt; std::endl;\n\n  // NaN (Not a Number)\n  // NaN\u306e\u7b26\u53f7\u30d3\u30c3\u30c8\u3082\u691c\u51fa\u3067\u304d\u308b\n  const double nan = std::numeric_limits&lt;double&gt;::quiet_NaN();\n  std::cout &lt;&lt; \&#34;nan   : \&#34; &lt;&lt; std::signbit(nan) &lt;&lt; std::endl;\n  std::cout &lt;&lt; \&#34;-nan  : \&#34; &lt;&lt; std::signbit(-nan) &lt;&lt; std::endl;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;cmath&#34;, &#34;signbit&#34;]}">
   <nav class="navbar navbar-default" role="navigation">
     <div class="container-fluid">
       <div class="navbar-header">
@@ -188,8 +188,8 @@
 
     <p class="text-right"><small>
       最終更新日時(UTC):
-      <span itemprop="datePublished" content="2026-01-10T15:56:54">
-        2026年01月10日 15時56分54秒
+      <span itemprop="datePublished" content="2026-01-12T00:14:56">
+        2026年01月12日 00時14分56秒
       </span>
       <br/>
       <span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -239,21 +239,21 @@ <h2>概要</h2>
 </ul>
 <h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></h2>
 <p>パラメータ<code>x</code>が負数である場合、<code>true</code>を返す。そうでない場合、<code>false</code>を返す。</p>
-<p>この関数はその名前の通り、浮動小数点数の符号ビットを検出する。そのため、<code>NaN</code>の符号を検出することができる。<br />
+<p>この関数はその名前の通り、浮動小数点数の符号ビットを検出する。そのため、<code>NaN</code>の符号を検出することができる。
 他には<code><a href="copysign.html">std::copysign</a></code>でも検出でき、この2つのみが<code>NaN</code>の符号を検出できる移植性のある方法となる。</p>
 <h2>備考</h2>
 <ul>
 <li>C標準ライブラリでは<code>signbit</code>は関数マクロとして定義されるが、C++標準ライブラリでは関数として定義される</li>
 <li>C++23では、(1), (2), (3)が(4)に統合され、<a class="cpprefjp-defined-word" data-desc="&lt;stdfloat&gt;で定義される内部表現の規定された浮動小数点数型" href="../stdfloat.html">拡張浮動小数点数型</a>を含む浮動小数点数型への<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>として定義された</li>
 </ul>
 <h2>例</h2>
-<p><div class="yata" id="d675e4a98f51731f3b0dfeec69045e2d65b8ae6c"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
+<p><div class="yata" id="b215c742dae70cc54b14462a858c7708eb89227e"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
 <span class="cp">#include</span> <span class="cpf"><a href="../cmath.html">&lt;cmath&gt;</a></span><span class="cp"></span>
 <span class="cp">#include</span> <span class="cpf"><a href="../limits.html">&lt;limits&gt;</a></span><span class="cp"></span>
 
 <span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
 <span class="p">{</span>
-<span class="c1">// 通常の数値</span>
+  <span class="c1">// 通常の数値</span>
   <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ios/boolalpha.html">std::boolalpha</a></span><span class="p">;</span>
   <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"-1.0f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::signbit</span></span><span class="p">(</span><span class="o">-</span><span class="mf">1.0f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
   <span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"-0.0f : "</span> <span class="o">&lt;&lt;</span> <span class="n"><span style="color:#ff0000">std::signbit</span></span><span class="p">(</span><span class="o">-</span><span class="mf">0.0f</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>