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‎reference/flat_map/flat_map.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="2025-01-26T08:31:30">
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2025年01月26日 08時31分30秒
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<span itemprop="datePublished" content="2025-01-27T14:35:27">
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2025年01月27日 14時35分27秒
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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/flat_map/flat_map/keys.md.nolink">keys</span></code></td>
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<td><code><a href="flat_map/keys.html">keys</a></code></td>
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<td>キーのコンテナを取得する</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/flat_map/flat_map/values.md.nolink">values</span></code></td>
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<td><code><a href="flat_map/values.html">values</a></code></td>
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<td>値のコンテナを取得する</td>
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<td>C++23</td>
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‎reference/flat_map/flat_map/keys.html‎

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-01-27T14:35:27">
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2025年01月27日 14時35分27秒
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が更新
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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/flat_map/flat_map/keys.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;flat_map&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class flat_map">flat_map::</span><span class="token">keys</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">const</span> <span class="n">key_container_type</span><span class="o">&amp;</span> <span class="n">keys</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span><span class="p">;</span> <span class="c1">// 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>キーのコンテナを取得する。</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><code>flat_map</code> クラス内部で保持しているキーのコンテナ。</p>
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<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Complexity。関数が使うアルゴリズムの空間計算量・時間計算量">計算量</a></h2>
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<p>定数時間</p>
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<h2>例</h2>
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<p><div class="yata" id="2a19951c37d035d451521ac22ca5ec30f0b4ac32"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../../flat_map.html">&lt;flat_map&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="../../type_traits.html">&lt;type_traits&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>
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<span class="p">{</span>
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<span class="n">std</span><span class="o">::</span><span class="n">flat_map</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="kt">char</span><span class="o">&gt;</span> <span class="n">fm</span><span class="p">;</span>
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<span class="n">fm</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span> <span class="o">=</span> <span class="sc">'C'</span><span class="p">;</span>
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<span class="n">fm</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="sc">'A'</span><span class="p">;</span>
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<span class="n">fm</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="o">=</span> <span class="sc">'B'</span><span class="p">;</span>
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<span class="k">static_assert</span><span class="p">(</span><span class="n"><a href="../../type_traits/is_same.html">std::is_same_v</a></span><span class="o">&lt;</span><span class="k">decltype</span><span class="p">(</span><span class="n">fm</span><span class="p">.</span><span class="n"><span style="color:#ff0000">keys()</span></span><span class="p">),</span> <span class="k">const</span> <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;&amp;&gt;</span><span class="p">);</span>
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<span class="k">for</span> <span class="p">(</span><span class="k">auto</span> <span class="nl">i</span> <span class="p">:</span> <span class="n">fm</span><span class="p">.</span><span class="n"><span style="color:#ff0000">keys()</span></span><span class="p">)</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">i</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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<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>1
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2
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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>: ??</li>
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<li><a href="../../../implementation.html#gcc">GCC</a>: ??</li>
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<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
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</ul>
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<h2>関連項目</h2>
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<table border="1" bordercolor="#888" style="border-collapse:collapse">
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<thead>
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<th>名前</th>
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<th>説明</th>
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</thead>
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<tbody>
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<tr>
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<td><code><a href="values.html">flat_map::values</a></code></td>
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<td>値のコンテナを取得する</td>
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</tr>
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</tbody>
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