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‎reference/concepts/derived_from.html

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</head>
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;concepts&#34;], &#34;id-type&#34;: [&#34;concept&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;77c82ffc736c20feb3887ca84e26d4d72be45546&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;concepts&gt;\n\ntemplate&lt;typename T, typename U&gt;\nrequires std::derived_from&lt;T, U&gt;\nvoid check_derived() {\n std::cout &lt;&lt; \&#34;U is base class of T\&#34; &lt;&lt; std::endl;\n}\n\ntemplate&lt;typename T, typename U&gt;\nvoid check_derived() {\n std::cout &lt;&lt; \&#34;U and T are others\&#34; &lt;&lt; std::endl;\n}\n\nstruct Base {};\n\n//public\u7d99\u627f\nstruct Derived1 : Base {};\n//private\nstruct Derived2 : private Base {};\n//protected\nstruct Derived3 : protected Base {};\n//\u66d6\u6627\u306a\u7d99\u627f\nstruct Derived4 : Base, Derived1 {};\n//\u4eee\u60f3\u7d99\u627f\nstruct Derived5 : virtual public Base {};\nstruct Derived6 : virtual public Base {};\nstruct Derived7 : Derived5, Derived6 {};\n//\u7d99\u627f\u306e\u7d99\u627f\nstruct Derived8 : Derived1 {};\n\nint main()\n{\n check_derived&lt;int, int&gt;();\n check_derived&lt;Base, const Base&gt;();\n check_derived&lt;Derived1, Base&gt;();\n check_derived&lt;Derived2, Base&gt;();\n check_derived&lt;Derived3, Base&gt;();\n check_derived&lt;Derived4, Base&gt;();\n check_derived&lt;Derived5, Base&gt;();\n check_derived&lt;Derived7, Base&gt;();\n check_derived&lt;Derived8, Base&gt;();\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;concepts&#34;, &#34;derived_from&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;concepts&#34;], &#34;id-type&#34;: [&#34;concept&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;0c22f27a1f1f2c2325f7f34c536b793b04f79f08&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;concepts&gt;\n\ntemplate&lt;typename T, typename U&gt;\nrequires std::derived_from&lt;T, U&gt;\nvoid check_derived() {\n std::cout &lt;&lt; \&#34;U is base class of T\&#34; &lt;&lt; std::endl;\n}\n\ntemplate&lt;typename T, typename U&gt;\nvoid check_derived() {\n std::cout &lt;&lt; \&#34;U is not base class of T\&#34; &lt;&lt; std::endl;\n}\n\nstruct Base {};\n\n//public\u7d99\u627f\nstruct Derived1 : Base {};\n//private\u7d99\u627f\nstruct Derived2 : private Base {};\n//protected\u7d99\u627f\nstruct Derived3 : protected Base {};\n//\u66d6\u6627\u306a\u7d99\u627f\nstruct Derived4 : Base, Derived1 {};\n//\u4eee\u60f3\u7d99\u627f\nstruct Derived5 : virtual public Base {};\nstruct Derived6 : virtual public Base {};\nstruct Derived7 : Derived5, Derived6 {};\n//\u7d99\u627f\u306e\u7d99\u627f\nstruct Derived8 : Derived1 {};\n\nint main()\n{\n check_derived&lt;int, int&gt;();\n check_derived&lt;Base, const Base&gt;();\n check_derived&lt;Derived1, Base&gt;();\n check_derived&lt;Derived2, Base&gt;();\n check_derived&lt;Derived3, Base&gt;();\n check_derived&lt;Derived4, Base&gt;();\n check_derived&lt;Derived5, Base&gt;();\n check_derived&lt;Derived7, Base&gt;();\n check_derived&lt;Derived8, Base&gt;();\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;concepts&#34;, &#34;derived_from&#34;]}">
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<nav class="navbar navbar-default" role="navigation">
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<div class="container-fluid">
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<div class="navbar-header">
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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="2024-06-11T13:45:38">
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2024年06月11日 13時45分38秒
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<span itemprop="datePublished" content="2025-07-08T13:32:19">
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2025年07月08日 13時32分19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 itemprop="name">suomesta</span>
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</span>
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が更新
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</small></p>
@@ -229,9 +229,9 @@ <h2>備考</h2>
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<li><code>Base</code>は<code>Derived</code>の曖昧ではない<code>public</code>継承されたクラスである</li>
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<li><code>Base</code>と<code>Derived</code>は<a class="cpprefjp-defined-word" data-desc="型をconstおよび・もしくはvolatileで修飾すること">CV修飾</a>の違いを除いて同じクラス型である</li>
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</ul>
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<p><code>Derived</code>が<code>Base</code>を公開継承しない場合、<code><a href="../type_traits/is_base_of.html">std::is_base_of&lt;Derived, Base&gt;</a></code>の判定とは異なる結果となる。</p>
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<p><code>Derived</code>が<code>Base</code>を公開継承しない場合、<code><a href="../type_traits/is_base_of.html">std::is_base_of&lt;Base, Derived&gt;</a></code>の判定とは異なる結果となる。</p>
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<h2>例</h2>
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<p><div class="yata" id="77c82ffc736c20feb3887ca84e26d4d72be45546"><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>
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<p><div class="yata" id="0c22f27a1f1f2c2325f7f34c536b793b04f79f08"><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>
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<span class="cp">#include</span> <span class="cpf"><a href="../concepts.html">&lt;concepts&gt;</a></span><span class="cp"></span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="p">,</span> <span class="k">typename</span> <span class="n">U</span><span class="o">&gt;</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">T</span><span class="p">,</span> <span class="k">typename</span> <span class="n">U</span><span class="o">&gt;</span>
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<span class="kt">void</span> <span class="n">check_derived</span><span class="p">()</span> <span class="p">{</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"U and T are others"</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"U is not base class of T"</span> <span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">struct</span> <span class="n">Base</span> <span class="p">{};</span>
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<span class="c1">//public継承</span>
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<span class="k">struct</span> <span class="nl">Derived1</span> <span class="p">:</span> <span class="n">Base</span> <span class="p">{};</span>
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<span class="c1">//private</span>
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<span class="c1">//private継承</span>
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<span class="k">struct</span> <span class="nl">Derived2</span> <span class="p">:</span> <span class="k">private</span> <span class="n">Base</span> <span class="p">{};</span>
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<span class="c1">//protected</span>
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<span class="c1">//protected継承</span>
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<span class="k">struct</span> <span class="nl">Derived3</span> <span class="p">:</span> <span class="k">protected</span> <span class="n">Base</span> <span class="p">{};</span>
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<span class="c1">//曖昧な継承</span>
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<span class="k">struct</span> <span class="nl">Derived4</span> <span class="p">:</span> <span class="n">Base</span><span class="p">,</span> <span class="n">Derived1</span> <span class="p">{};</span>
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</code></pre></div>
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</div></p>
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<h3>出力</h3>
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<p><pre><code>U and T are others
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<p><pre><code>U is not base class of T
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U is base class of T
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U is base class of T
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U and T are others
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U and T are others
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U and T are others
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U is not base class of T
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U is not base class of T
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U is not base class of T
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U is base class of T
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U is base class of T
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U is base class of T

‎rss.xml

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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>2025-07-08T12:01:29.490728</updated>
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88

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<entry>
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<title>derived_from -- improve std::derived_from</title>
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<link href="https://cpprefjp.github.io/reference/concepts/derived_from.html"/>
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<id>3f31163a0b1c6633b1c6940c4493066da0f339bc:reference/concepts/derived_from.md</id>
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<updated>2025-07-08T22:32:19+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/concepts/derived_from.md b/reference/concepts/derived_from.md
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index 869a70edd..2951ef9a9 100644
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--- a/reference/concepts/derived_from.md
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+++ b/reference/concepts/derived_from.md
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@@ -27,7 +27,7 @@ namespace std {
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- `Base`は`Derived`の曖昧ではない`public`継承されたクラスである
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- `Base`と`Derived`はCV修飾の違いを除いて同じクラス型である
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-`Derived`が`Base`を公開継承しない場合、[`std::is_base_of&amp;lt;Derived, Base&amp;gt;`](/reference/type_traits/is_base_of.md)の判定とは異なる結果となる。
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+`Derived`が`Base`を公開継承しない場合、[`std::is_base_of&amp;lt;Base, Derived&amp;gt;`](/reference/type_traits/is_base_of.md)の判定とは異なる結果となる。
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## 例
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```cpp example
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@@ -42,16 +42,16 @@ void check_derived() {
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template&amp;lt;typename T, typename U&amp;gt;
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void check_derived() {
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- std::cout &amp;lt;&amp;lt; &amp;#34;U and T are others&amp;#34; &amp;lt;&amp;lt; std::endl;
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+ std::cout &amp;lt;&amp;lt; &amp;#34;U is not base class of T&amp;#34; &amp;lt;&amp;lt; std::endl;
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}
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struct Base {};
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//public継承
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struct Derived1 : Base {};
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-//private
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+//private継承
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struct Derived2 : private Base {};
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-//protected
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+//protected継承
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struct Derived3 : protected Base {};
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//曖昧な継承
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struct Derived4 : Base, Derived1 {};
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### 出力
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```
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-U and T are others
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+U is not base class of T
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U is base class of T
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U is base class of T
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-U and T are others
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-U and T are others
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-U and T are others
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+U is not base class of T
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+U is not base class of T
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+U is not base class of T
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U is base class of T
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U is base class of T
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U is base class of T
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&lt;/code&gt;&lt;/pre&gt;</summary>
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<author>
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<name>suomesta</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>realloc -- update</title>
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<link href="https://cpprefjp.github.io/reference/cstdlib/realloc.html"/>

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