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‎reference/ranges/cartesian_product_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="2024-10-11T03:28:28">
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2024年10月11日 03時28分28秒
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<span itemprop="datePublished" content="2025-06-04T03:06:39">
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2025年06月04日 03時06分39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">I</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>
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</thead>
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<tbody>
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<td><code><span href="https://cpprefjp.github.io/reference/ranges/cartesian_product_view/op_constructor.md.nolink">(constructor)</span></code></td>
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<td><code><a href="cartesian_product_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++23</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/cartesian_product_view/begin.md.nolink">begin</span></code></td>
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<td><code><a href="cartesian_product_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++23</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/cartesian_product_view/end.md.nolink">end</span></code></td>
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<td><code><a href="cartesian_product_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++23</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/cartesian_product_view/size.md.nolink">size</span></code></td>
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<td><code><a href="cartesian_product_view/size.html">size</a></code></td>
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<td>要素数を取得する</td>
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<td>C++23</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/cartesian_product_view/op_deduction_guide.md.nolink">(deduction_guide)</span></code></td>
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<td><code><a href="cartesian_product_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++23</td>
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</tr>
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<ul>
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<li><a href="../../implementation.html#clang">Clang</a>: 16.0 <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>: 13.2 <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>: ??</li>
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<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2022 Update 7 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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</ul>
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<h2>参照</h2>
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<ul>

‎reference/ranges/cartesian_product_view/begin.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="2025-06-04T03:06:39">
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2025年06月04日 03時06分39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/cartesian_product_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/cartesian_product_view/begin.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 cartesian_product_view">cartesian_product_view::</span><span class="token">begin</span><span class="cpp cpp23" title="C++23で追加">(C++23)</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"><i>iterator</i></span><span class="o">&lt;</span><span class="nb">false</span><span class="o">&gt;</span> <span class="n">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">First</span><span class="o">&gt;</span> <span class="o">||</span> <span class="p">...</span> <span class="o">||</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">Vs</span><span class="o">&gt;</span><span class="p">);</span> <span class="c1">// (1) C++23</span>
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<span class="k">constexpr</span> <span class="n"><i>iterator</i></span><span class="o">&lt;</span><span class="nb">true</span><span class="o">&gt;</span> <span class="n">begin</span><span class="p">()</span> <span class="k">const</span><span class="p">;</span> <span class="c1">// (2) C++23</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>先頭要素を指すイテレータを取得する。</p>
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<h2>効果</h2>
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<ul>
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<li>(1), (2) : 以下と等価
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<br />
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<div class="codehilite"><pre><span></span><code><span class="k">return</span> <span class="n">iterator</span><span class="o">&lt;</span><span class="n">Const</span><span class="o">&gt;</span><span class="p">(</span><span class="o">*</span><span class="k">this</span><span class="p">,</span> <span class="n"><a href="../../tuple/tuple.html">tuple</a></span><span class="o">-</span><span class="n">transform</span><span class="p">(</span><span class="n"><a href="../begin.html">ranges::begin</a></span><span class="p">,</span> <span class="n">bases_</span><span class="p">));</span>
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</code></pre></div>
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</li>
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</ul>
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<p>ここで、<code>iterator</code>は説明専用のイテレータクラスであり、<code>tuple-transform</code>は説明専用の関数で、tupleの各要素に関数を適用する。<code>Const</code>は各<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>に応じて<code>false</code>または<code>true</code>となる。</p>
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<h2>例</h2>
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<p><div class="yata" id="5fb6e2c26a2626331c593e1139baeccdc72d0b0a"><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="../../list.html">&lt;list&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../../print.html">&lt;print&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">v</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>
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<span class="n"><a href="../../list/list.html">std::list</a></span><span class="o">&lt;</span><span class="kt">char</span><span class="o">&gt;</span> <span class="n">l</span> <span class="o">=</span> <span class="p">{</span><span class="sc">'a'</span><span class="p">,</span> <span class="sc">'b'</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">cartesian_product_view</span> <span class="n">cv</span><span class="p">{</span><span class="n">v</span><span class="p">,</span> <span class="n">l</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">cv</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="c1">// 最初の要素を出力</span>
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<span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"first element: {}"</span><span class="p">,</span> <span class="o">*</span><span class="n">it</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>first element: (1, 'a')
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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++23</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>: 16.0 <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>: 13.2 <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 7 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://timsong-cpp.github.io/cppwp/n4950/range.cartesian" target="_blank">N4950 26.7.33 Cartesian product view</a></li>
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</ul></div>
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</div>
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</div>
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</div>
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<div id="sidebar" class="col-sm-3 col-sm-pull-9">
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</div>
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</div>
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</div>
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</main>
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<footer class="footer navbar navbar-default">
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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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