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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="2025-05-13T08:20:39">
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2025年05月13日 08時20分39秒
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<span itemprop="datePublished" content="2025-06-04T10:07:53">
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2025年06月04日 10時07分53秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -542,7 +542,7 @@ <h3>コンテナ</h3>
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<li><code><a href="../reference/span/span.html">std::span</a></code>と<code><a href="../reference/mdspan/mdspan.html">std::mdspan</a></code>の推論補助を改善</li>
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<li><code><a href="../reference/ranges/concat_view.html">std::views::concat</a></code>を追加</li>
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<li><code><span href="https://cpprefjp.github.io/reference/ranges/cache_latest.md.nolink">std::views::cache_latest</span></code>を追加</li>
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<li><code><span href="https://cpprefjp.github.io/reference/ranges/to_input_view.md.nolink">std::views::to_input</span></code>を追加。書き換えできない入力専用の値に変換する</li>
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<li><code><a href="../reference/ranges/to_input_view.html">std::views::to_input</a></code>を追加。これはパフォーマンス向上のために、Rangeを入力Rangeかつ非<code><a href="../reference/ranges/common_range.html">common_range</a></code> (イテレータと番兵の型を別する) に変換する</li>
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<li>Range関係の、償却定数時間での要素追加を行う機能を追加<ul>
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<li>各viewクラスに<code>reserve_hint()</code>メンバ関数を追加</li>
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<li><code><span href="https://cpprefjp.github.io/reference/ranges/reserve_hint.md.nolink">std::ranges::reserve_hint()</span></code>関数を追加</li>

‎reference/ranges.html

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-08-30T16:58:39">
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2024年08月30日 16時58分39秒
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<span itemprop="datePublished" content="2025-06-04T10:07:53">
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2025年06月04日 10時07分53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">Tetsuro Matsumura</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>
@@ -1382,6 +1382,28 @@ <h3>cartesian product view</h3>
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</tr>
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</tbody>
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</table>
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<h3>to input view</h3>
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<table border="1" bordercolor="#888" style="border-collapse:collapse">
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<thead>
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<tr>
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<th>名前</th>
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<th>説明</th>
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<th>対応バージョン</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code><a href="ranges/to_input_view.html">to_input_view</a></code></td>
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<td>入力用Rangeに変換する (class template)</td>
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<td>C++26</td>
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</tr>
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<tr>
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<td><code><a href="ranges/to_input_view.html">views::to_input</a></code></td>
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<td><code>to_input_view</code>を生成する (customization point object)</td>
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<td>C++26</td>
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</tr>
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</tbody>
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</table>
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<h2>Range変換</h2>
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<table border="1" bordercolor="#888" style="border-collapse:collapse">
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<thead>

‎reference/ranges/to_input_view.html

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‎reference/ranges/to_input_view/base.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;class&#34;: [&#34;to_input_view&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp26&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;593cf1199b8872c3a10efba5df84fcc49d9860a4&#34;, &#34;source&#34;: &#34;#include &lt;ranges&gt;\n#include &lt;vector&gt;\n#include &lt;iostream&gt;\n\nint main() {\n std::vector&lt;int&gt; vec = {1, 2, 3, 4, 5};\n\n std::ranges::to_input_view view{vec};\n\n // (1) \u30b3\u30d4\u30fc\u3057\u3066\u53d6\u5f97\n std::vector&lt;int&gt; v1 = view.base();\n\n // (2) \u30e0\u30fc\u30d6\u3057\u3066\u53d6\u5f97\n std::ranges::to_input_view view2{vec};\n std::vector&lt;int&gt; v2 = std::move(view2).base();\n\n std::cout &lt;&lt; v1.size() &lt;&lt; std::endl;\n std::cout &lt;&lt; v2.size() &lt;&lt; std::endl;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;ranges&#34;, &#34;to_input_view&#34;, &#34;base&#34;]}">
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<span itemprop="name">to_input_view</span>
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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="2025-06-04T10:24:51">
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2025年06月04日 10時24分51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/ranges/to_input_view/base.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/ranges/to_input_view/base.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">function</div><div class="header">&lt;ranges&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std::ranges">std::ranges::</span><span class="class" title="class to_input_view">to_input_view::</span><span class="token">base</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="k">constexpr</span> <span class="n">V</span> <span class="nf">base</span><span class="p">()</span> <span class="k">const</span><span class="o">&amp;</span>
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<span class="n">requires</span> <span class="n"><a href="../../concepts/copy_constructible.html">copy_constructible</a></span><span class="o">&lt;</span><span class="n">V</span><span class="o">&gt;</span><span class="p">;</span> <span class="c1">// (1) C++26</span>
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<span class="k">constexpr</span> <span class="n">V</span> <span class="nf">base</span><span class="p">()</span> <span class="o">&amp;&amp;</span><span class="p">;</span> <span class="c1">// (2) 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>メンバ変数として保持している、元のRangeを取得する。</p>
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<h2>効果</h2>
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<ul>
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<li>(1): <code>return base_;</code></li>
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<li>(2): <code>return std::move(base_);</code></li>
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</ul>
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<h2>例</h2>
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<p><div class="yata" id="593cf1199b8872c3a10efba5df84fcc49d9860a4"><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="../../vector.html">&lt;vector&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="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> <span class="mi">5</span><span class="p">};</span>
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<span class="n">std</span><span class="o">::</span><span class="n">ranges</span><span class="o">::</span><span class="n">to_input_view</span> <span class="n"><a href="../view.html">view</a></span><span class="p">{</span><span class="n">vec</span><span class="p">};</span>
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<span class="c1">// (1) コピーして取得</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">v1</span> <span class="o">=</span> <span class="n"><a href="../view.html">view</a></span><span class="p">.</span><span class="n">base</span><span class="p">();</span>
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<span class="c1">// (2) ムーブして取得</span>
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<span class="n">std</span><span class="o">::</span><span class="n">ranges</span><span class="o">::</span><span class="n">to_input_view</span> <span class="n"><a href="../view.html">view</a>2</span><span class="p">{</span><span class="n">vec</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">v2</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n"><a href="../view.html">view</a>2</span><span class="p">).</span><span class="n">base</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="n"><a href="../../vector/vector/size.html">v1.size()</a></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="n"><a href="../../vector/vector/size.html">v2.size()</a></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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</code></pre></div>
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</div></p>
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<h3>出力</h3>
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<p><pre><code>5
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5
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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>: 21 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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<li><a href="../../../implementation.html#gcc">GCC</a>: 15.1 <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>: 2022 Update 14 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<div class="container-fluid">
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<p><small>
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本サイトの情報は、
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<a href="https://creativecommons.org/licenses/by/3.0/deed.ja" rel="nofollow">クリエイティブ・コモンズ 表示 3.0 非移植 ライセンス(CC BY)</a>
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の下に提供されています。
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</small></p>
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</div>
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</footer>
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</body>
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</html>

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