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reference/ranges/empty_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="2025-05-29T04:50:36">
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2025年05月29日 04時50分36秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -216,14 +216,7 @@
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span> <span class="n">std</span><span class="o">::</span><span class="n">ranges</span> <span class="p">{</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span>
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<span class="n">requires</span> <span class="n"><a href="../type_traits/is_object.html">is_object_v</a></span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span>
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<span class="k">class</span> <span class="nc">empty_view</span> <span class="o">:</span> <span class="k">public</span> <span class="n"><a href="view_interface.html">view_interface</a></span><span class="o">&lt;</span><span class="n">empty_view</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;&gt;</span> <span class="p">{</span> <span class="c1">// (1)</span>
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<span class="k">public</span><span class="o">:</span>
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<span class="k">static</span> <span class="k">constexpr</span> <span class="n">T</span><span class="o">*</span> <span class="n">begin</span><span class="p">()</span> <span class="k">noexcept</span> <span class="p">{</span> <span class="k">return</span> <span class="k">nullptr</span><span class="p">;</span> <span class="p">}</span>
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<span class="k">static</span> <span class="k">constexpr</span> <span class="n">T</span><span class="o">*</span> <span class="n">end</span><span class="p">()</span> <span class="k">noexcept</span> <span class="p">{</span> <span class="k">return</span> <span class="k">nullptr</span><span class="p">;</span> <span class="p">}</span>
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<span class="k">static</span> <span class="k">constexpr</span> <span class="n">T</span><span class="o">*</span> <span class="n">data</span><span class="p">()</span> <span class="k">noexcept</span> <span class="p">{</span> <span class="k">return</span> <span class="k">nullptr</span><span class="p">;</span> <span class="p">}</span>
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<span class="k">static</span> <span class="k">constexpr</span> <span class="kt">size_t</span> <span class="n">size</span><span class="p">()</span> <span class="k">noexcept</span> <span class="p">{</span> <span class="k">return</span> <span class="mi">0</span><span class="p">;</span> <span class="p">}</span>
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<span class="k">static</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="n">empty</span><span class="p">()</span> <span class="k">noexcept</span> <span class="p">{</span> <span class="k">return</span> <span class="nb">true</span><span class="p">;</span> <span class="p">}</span>
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<span class="p">};</span>
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<span class="k">class</span> <span class="nc">empty_view</span> <span class="o">:</span> <span class="k">public</span> <span class="n"><a href="view_interface.html">view_interface</a></span><span class="o">&lt;</span><span class="n">empty_view</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;&gt;</span> <span class="p">{</span> <span class="err">……</span> <span class="p">};</span> <span class="c1">// (1)</span>
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<span class="k">namespace</span> <span class="n">views</span> <span class="p">{</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span>
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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/empty_view/begin.md.nolink">begin</span></code></td>
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<td><code><a href="empty_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/empty_view/end.md.nolink">end</span></code></td>
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<td><code><a href="empty_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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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/ranges/empty_view/data.md.nolink">data</span></code></td>
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<td><code><a href="empty_view/data.html">data</a></code></td>
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<td>配列の先頭へのポインタを取得する</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/empty_view/size.md.nolink">size</span></code></td>
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<td><code><a href="empty_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++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/empty_view/empty.md.nolink">empty</span></code></td>
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<td><code><a href="empty_view/empty.html">empty</a></code></td>
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<td>Rangeが空かどうかを判定する</td>
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<td>C++20</td>
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</tr>
@@ -363,7 +356,7 @@ <h2>例</h2>
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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="k">using</span> <span class="k">namespace</span> <span class="n">std</span><span class="p">;</span>
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<span class="k">static_assert</span><span class="p">(</span><span class="n">ranges</span><span class="o">::</span><span class="n">empty</span><span class="p">(</span><span class="n"><span style="color:#ff0000">views::empty</span></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">));</span>
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<span class="k">static_assert</span><span class="p">(</span><span class="n"><a href="empty.html">ranges::empty</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">views::empty</span></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">));</span>
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<span class="k">for</span><span class="p">(</span><span class="kt">int</span> <span class="nl">n</span> <span class="p">:</span> <span class="n"><span style="color:#ff0000">views::empty</span></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">n</span><span class="p">;</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="2025-05-29T04:50:36">
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2025年05月29日 04時50分36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/empty_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/empty_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 empty_view">empty_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">static</span> <span class="k">constexpr</span> <span class="n">T</span><span class="o">*</span> <span class="nf">begin</span><span class="p">()</span> <span class="k">noexcept</span><span class="p">;</span> <span class="c1">// (1) 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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<p><div class="codehilite"><pre><span></span><code><span class="k">return</span> <span class="k">nullptr</span><span class="p">;</span>
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</code></pre></div>
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</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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<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#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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