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‎reference/ranges/join_view.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="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="2025-06-02T07:28:54">
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2025年06月02日 07時28分54秒
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</span>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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</thead>
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<tbody>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/ranges/join_view/op_constructor.md.nolink">(constructor)</span></code></td>
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<td><code><a href="join_view/op_constructor.html">(constructor)</a></code></td>
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<td>コンストラクタ</td>
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<td>C++20</td>
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</tr>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/ranges/join_view/base.md.nolink">base</span></code></td>
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<td><code><a href="join_view/base.html">base</a></code></td>
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<td><code>V</code>の参照を取得する</td>
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<td>C++20</td>
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</tr>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/ranges/join_view/begin.md.nolink">begin</span></code></td>
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<td><code><a href="join_view/begin.html">begin</a></code></td>
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<td>先頭を指すイテレータを取得する</td>
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<td>C++20</td>
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</tr>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/ranges/join_view/end.md.nolink">end</span></code></td>
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<td><code><a href="join_view/end.html">end</a></code></td>
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<td>番兵を取得する</td>
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<td>C++20</td>
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</tr>
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</thead>
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<td><code><span href="https://cpprefjp.github.io/reference/ranges/join_view/op_deduction_guide.md.nolink">(deduction_guide)</span></code></td>
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<td><code><a href="join_view/op_deduction_guide.html">(deduction_guide)</a></code></td>
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<td>クラステンプレートの推論補助</td>
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<td>C++20</td>
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</tr>

‎reference/ranges/join_view/base.html

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‎reference/ranges/join_view/begin.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;join_view&#34;], &#34;id-type&#34;: [&#34;function&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;a3eff29bcd5e5fd3452c86952f3479f8bf52fc93&#34;, &#34;source&#34;: &#34;#include &lt;ranges&gt;\n#include &lt;vector&gt;\n#include &lt;string&gt;\n#include &lt;iostream&gt;\n\nint main() {\n std::vector&lt;std::string&gt; words = {\&#34;hello\&#34;, \&#34;world\&#34;, \&#34;join\&#34;};\n\n std::ranges::join_view r{words};\n\n auto it = r.begin();\n\n char x = *it;\n std::cout &lt;&lt; x &lt;&lt; &#39;\\n&#39;;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;ranges&#34;, &#34;join_view&#34;, &#34;begin&#34;]}">
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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="2025-06-02T07:28:54">
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2025年06月02日 07時28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">
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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/join_view/begin.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/join_view/begin.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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</a>
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</div>
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<div class="row">
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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 join_view">join_view::</span><span class="token">begin</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">constexpr</span> <span class="k">auto</span> <span class="nf">begin</span><span class="p">()</span>
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<span class="n">requires</span> <span class="p">(</span><span class="o">!</span><span class="n">simple</span><span class="o">-</span><span class="n"><a href="../view.html">view</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++20</span>
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<span class="k">constexpr</span> <span class="k">auto</span> <span class="nf">begin</span><span class="p">()</span> <span class="k">const</span>
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<span class="n">requires</span> <span class="n"><a href="../range.html">range</a></span><span class="o">&lt;</span><span class="k">const</span> <span class="n">V</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span>
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<span class="n"><a href="../input_range.html">input_range</a></span><span class="o">&lt;</span><span class="n"><a href="../range_reference_t.html">range_reference_t</a></span><span class="o">&lt;</span><span class="k">const</span> <span class="n">V</span><span class="o">&gt;&gt;</span><span class="p">;</span> <span class="c1">// (2) C++20</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><code>view</code>の先頭要素を指すイテレータを取得する。</p>
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<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>
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<ul>
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<li>(1), (2) : <code>join_view</code>の先頭を指すイテレータを返す。外側のRangeが空でない場合、最初の内側Rangeの先頭要素を指す。外側のRangeが空の場合、<code><a href="end.html">end()</a></code>と等価なイテレータを返す。</li>
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</ul>
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<h2>例</h2>
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<p><div class="yata" id="a3eff29bcd5e5fd3452c86952f3479f8bf52fc93"><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="../../string.html">&lt;string&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="n"><a href="../../string/basic_string.html">std::string</a></span><span class="o">&gt;</span> <span class="n">words</span> <span class="o">=</span> <span class="p">{</span><span class="s">"hello"</span><span class="p">,</span> <span class="s">"world"</span><span class="p">,</span> <span class="s">"join"</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">join_view</span> <span class="n">r</span><span class="p">{</span><span class="n">words</span><span class="p">};</span>
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<span class="k">auto</span> <span class="n">it</span> <span class="o">=</span> <span class="n">r</span><span class="p">.</span><span class="n"><span style="color:#ff0000">begin</span></span><span class="p">();</span>
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<span class="kt">char</span> <span class="n">x</span> <span class="o">=</span> <span class="o">*</span><span class="n">it</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">x</span> <span class="o">&lt;&lt;</span> <span class="sc">'\n'</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>h
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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++20</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>: 13.0.0 <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>: 10.1.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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<li><a href="../../../implementation.html#icc">ICC</a>: ?</li>
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<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: 2019 Update 10 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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