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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="2025-01-20T12:47:26">
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2025年01月20日 12時47分26秒
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2025年01月23日 13時40分31秒
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</table>
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<h2>その他</h2>
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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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<td><code><a href="flat_map/uses_allocator.html">uses_allocator</a></code></td>
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<td><code>flat_map</code>による特殊化</td>
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<td>C++23</td>
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</tr>
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</tbody>
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</table>
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<h2>例</h2>
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<h3>基本的な使い方</h3>
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<p><div class="yata" id="f929d72149b18684b6cd73b6ded1e08ee5b7562d"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>

‎reference/flat_map/flat_map/uses_allocator.html

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2025年01月23日 13時40分31秒
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<div class="identifier-type">class template</div><div class="header">&lt;flat_map&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">uses_allocator</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">namespace</span> <span class="n">std</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">Key</span><span class="p">,</span> <span class="k">class</span> <span class="nc">T</span><span class="p">,</span> <span class="k">class</span> <span class="nc">Compare</span><span class="p">,</span> <span class="k">class</span> <span class="nc">KeyContainer</span><span class="p">,</span> <span class="k">class</span> <span class="nc">MappedContainer</span><span class="p">,</span>
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<span class="k">class</span> <span class="nc">Alloc</span><span class="o">&gt;</span>
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<span class="k">struct</span> <span class="n">uses_allocator</span><span class="o">&lt;</span><span class="n">flat_map</span><span class="o">&lt;</span><span class="n">Key</span><span class="p">,</span> <span class="n">T</span><span class="p">,</span> <span class="n">Compare</span><span class="p">,</span> <span class="n">KeyContainer</span><span class="p">,</span> <span class="n">MappedContainer</span><span class="o">&gt;</span><span class="p">,</span>
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<span class="n">Alloc</span><span class="o">&gt;</span>
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<span class="o">:</span> <span class="n"><a href="../../type_traits/bool_constant.html">bool_constant</a></span><span class="o">&lt;</span><span class="n">uses_allocator_v</span><span class="o">&lt;</span><span class="n">KeyContainer</span><span class="p">,</span> <span class="n">Alloc</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span>
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<span class="n">uses_allocator_v</span><span class="o">&lt;</span><span class="n">MappedContainer</span><span class="p">,</span> <span class="n">Alloc</span><span class="o">&gt;&gt;</span> <span class="p">{</span> <span class="p">};</span>
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<span class="p">}</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>uses_allocator</code>の、<code>flat_map</code>に対する特殊化。</p>
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<p>アロケータを指定する<code>flat_map</code>のコンストラクタにおいて、指定されたアロケータと、<code>KeyContainer</code>および<code>MappedContainer</code>が合致するかをチェックするのに使われる。</p>
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<h2>例</h2>
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<p><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="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="k">using</span> <span class="n">fm_t</span> <span class="o">=</span> <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">int</span><span class="o">&gt;</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"><span style="color:#ff0000">std::uses_allocator</span></span><span class="o">&lt;</span><span class="n">fm_t</span><span class="p">,</span> <span class="n"><a href="../../memory/allocator.html">std::allocator</a></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;&gt;::</span><span class="n">value</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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</p>
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<h3>出力</h3>
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<p><div class="codehilite"><pre><span></span><code><span class="mi">1</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++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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