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‎reference/ranges/as_const_view.html‎

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;ranges&#34;], &#34;namespace&#34;: [&#34;std::ranges&#34;], &#34;id-type&#34;: [&#34;class template&#34;], &#34;cpp&#34;: [&#34;cpp23&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;cd90cb3ae3e3cf61d2c5f08a740b627e38379db6&#34;, &#34;source&#34;: &#34;#include &lt;ranges&gt;\n#include &lt;iostream&gt;\n\nint main() {\n std::vector&lt;int&gt; vec = {1, 2, 3, 4};\n\n for (auto&amp; i : vec | std::views::as_const) {\n std::cout &lt;&lt; i &lt;&lt; &#39; &#39;;\n\n // \u5909\u66f4\u4e0d\u53ef\n //i = 0\n }\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;ranges&#34;, &#34;as_const_view&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;ranges&#34;], &#34;namespace&#34;: [&#34;std::ranges&#34;], &#34;id-type&#34;: [&#34;class template&#34;], &#34;cpp&#34;: [&#34;cpp23&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;b95e9a1ad0e162e9a6d9d63753b30fb78c135cc1&#34;, &#34;source&#34;: &#34;#include &lt;ranges&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n\nint main() {\n std::vector&lt;int&gt; vec = {1, 2, 3, 4};\n\n for (auto&amp; i : vec | std::views::as_const) {\n std::cout &lt;&lt; i &lt;&lt; &#39; &#39;;\n\n // \u5909\u66f4\u4e0d\u53ef\n //i = 0\n }\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;ranges&#34;, &#34;as_const_view&#34;]}">
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<nav class="navbar navbar-default" role="navigation">
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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="2025-06-04T09:35:54">
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2025年06月04日 09時35分54秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -379,8 +379,9 @@ <h2>推論補助</h2>
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</tbody>
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</table>
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<h2>例</h2>
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<p><div class="yata" id="cd90cb3ae3e3cf61d2c5f08a740b627e38379db6"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../ranges.html">&lt;ranges&gt;</a></span><span class="cp"></span>
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<p><div class="yata" id="b95e9a1ad0e162e9a6d9d63753b30fb78c135cc1"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../ranges.html">&lt;ranges&gt;</a></span><span class="cp"></span>
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<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="../vector.html">&lt;vector&gt;</a></span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">vec</span> <span class="o">=</span> <span class="p">{</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">};</span>

‎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>2025-06-04T05:12:07.567664</updated>
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<id>5a0d8c3f-f4b3-49b3-abdf-cc549f29b3d6</id>
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<updated>2025-06-04T09:40:01.994556</updated>
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<id>07ee47ed-e9a0-4f42-ad78-601183517a0f</id>
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88

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<entry>
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<title>as_const_view -- as_const_view : 例のインクルード不足を修正</title>
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<link href="https://cpprefjp.github.io/reference/ranges/as_const_view.html"/>
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<id>0923d23a602778d490aee9e26aff6b690ae5723a:reference/ranges/as_const_view.md</id>
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<updated>2025-06-04T18:35:54+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/as_const_view.md b/reference/ranges/as_const_view.md
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index 53d93ab59..68310616e 100644
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--- a/reference/ranges/as_const_view.md
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+++ b/reference/ranges/as_const_view.md
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@@ -73,6 +73,7 @@ namespace std::ranges {
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```cpp example
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#include &amp;lt;ranges&amp;gt;
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#include &amp;lt;iostream&amp;gt;
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+#include &amp;lt;vector&amp;gt;
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int main() {
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std::vector&amp;lt;int&amp;gt; vec = {1, 2, 3, 4};
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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>faithandbrave@gmail.com</email>
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</author>
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</entry>
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<entry>
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<title>uses_allocator_construction_args -- uses_allocator_construction_args : C++23対応 #1063</title>
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<link href="https://cpprefjp.github.io/reference/memory/uses_allocator_construction_args.html"/>
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## 推論補助
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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>faithandbrave@gmail.com</email>
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</author>
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</entry>
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<entry>
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<title>empty_view -- empty_view : enable_borrowed_rangeを追加 #713</title>
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<link href="https://cpprefjp.github.io/reference/ranges/empty_view.html"/>
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<id>a4199a45d9a3bb53893b210deae79a32a5e4a1fb:reference/ranges/empty_view.md</id>
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<updated>2025-06-04T13:20:30+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/empty_view.md b/reference/ranges/empty_view.md
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--- a/reference/ranges/empty_view.md
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+++ b/reference/ranges/empty_view.md
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| 名前 | 説明 | 対応バージョン |
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|-------------------------------------------------------|------------------------------|----------------|
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-| [`enable_borrowed_range`](empty_view/enable_borrowed_range.md.nolink) | `enable_borrowed_range`の特殊化 (variable template) | C++20 |
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+| [`enable_borrowed_range`](empty_view/enable_borrowed_range.md) | `enable_borrowed_range`の特殊化 (variable template) | C++20 |
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## 例
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```cpp example
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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>faithandbrave@gmail.com</email>
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</author>
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</entry>
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<entry>
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<title>enable_borrowed_range -- empty_view : enable_borrowed_rangeを追加 #713</title>
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<link href="https://cpprefjp.github.io/reference/ranges/empty_view/enable_borrowed_range.html"/>
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<id>a4199a45d9a3bb53893b210deae79a32a5e4a1fb:reference/ranges/empty_view/enable_borrowed_range.md</id>
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<updated>2025-06-04T13:20:30+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/empty_view/enable_borrowed_range.md b/reference/ranges/empty_view/enable_borrowed_range.md
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--- /dev/null
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+++ b/reference/ranges/empty_view/enable_borrowed_range.md
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@@ -0,0 +1,56 @@
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+# enable_borrowed_range
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+* ranges[meta header]
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+* std::ranges[meta namespace]
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+* empty_view[meta class]
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+* variable template[meta id-type]
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+* cpp20[meta cpp]
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+
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+```cpp
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+namespace std::ranges {
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+ template&amp;lt;class T&amp;gt;
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+ inline constexpr bool enable_borrowed_range&amp;lt;empty_view&amp;lt;T&amp;gt;&amp;gt; = true;
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+}
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+```
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+
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+## 概要
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+
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+`empty_view`に対する[`enable_borrowed_range`](../enable_borrowed_range.md)の特殊化。
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+
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+`empty_view`は常に空であり、要素への参照を返すことがないため、安全に借用可能である。
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+
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+## 備考
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+
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+この特殊化により、`empty_view`は[`borrowed_range`](../borrowed_range.md)コンセプトを満たすようになる。
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+
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+## 例
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+```cpp example
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+#include &amp;lt;ranges&amp;gt;
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+#include &amp;lt;type_traits&amp;gt;
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+
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+int main() {
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+ // empty_viewはborrowed_rangeである
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+ static_assert(std::ranges::borrowed_range&amp;lt;std::ranges::empty_view&amp;lt;int&amp;gt;&amp;gt;);
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+
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+ // enable_borrowed_rangeがtrueに設定されている
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+ static_assert(std::ranges::enable_borrowed_range&amp;lt;std::ranges::empty_view&amp;lt;int&amp;gt;&amp;gt;);
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+}
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+```
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+* std::ranges::borrowed_range[link ../borrowed_range.md]
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+* std::ranges::enable_borrowed_range[link ../enable_borrowed_range.md]
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+
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+### 出力
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+```
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+```
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+
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+## バージョン
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+### 言語
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+- C++20
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+
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+### 処理系
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+- [Clang](/implementation.md#clang): 13.0.0 [mark verified]
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+- [GCC](/implementation.md#gcc): 10.1.0 [mark verified]
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+- [ICC](/implementation.md#icc): ?
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+- [Visual C++](/implementation.md#visual_cpp): 2019 Update 10 [mark verified]
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+
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+## 参照
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+- [N4861 24.7.8 Empty view](https://timsong-cpp.github.io/cppwp/n4861/range.empty)
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\ No newline at end of file
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&lt;/code&gt;&lt;/pre&gt;</summary>
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‎sitemap.xml‎

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