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<header data-kunai-mdinfo="{"meta": {"cpp": ["cpp17"], "category": ["node_handle"], "id-type": ["class template"]}, "sources": [{"id": "06bca4a1a7a41e8c01ea8700933a54290cd6e69f", "source": "#include <iostream>\n#include <map>\n\nint main()\n{\n // char \u3092\u30ad\u30fc\u3001int \u3092\u5024\u3068\u3057\u3066\u6271\u3046\u9023\u60f3\u914d\u5217\n std::map<char, int> m1, m2;\n\n // m1 \u3078\u633f\u5165\n m1.insert(std::make_pair('a', 10));\n m1.insert(std::make_pair('b', 20));\n m1.insert(std::make_pair('c', 30));\n\n // \u30ce\u30fc\u30c9\u3092\u53d6\u5f97(\u8981\u7d20\u306f\u3001\u30b3\u30d4\u30fc\u3082\u30e0\u30fc\u30d6\u3082\u3055\u308c\u306a\u3044)\n // \u306a\u304a\u3001node_type \u306f node_handle \u306e\u7279\u6b8a\u5316\u3067\u3042\u308b\n std::map<char, int>::node_type node = m1.extract('c');\n\n // m2 \u3078\u633f\u5165(\u8981\u7d20\u306f\u3001\u30b3\u30d4\u30fc\u3082\u30e0\u30fc\u30d6\u3082\u3055\u308c\u306a\u3044)\n m2.insert(std::move(node));\n\n std::cout << \"m1 :\" << std::endl;\n\n for (const auto& [key, value] : m1)\n std::cout << \"[\" << key << \", \" << value << \"]\" << std::endl;\n\n std::cout << \"\\n\" << \"m2 :\" << std::endl;\n\n for (const auto& [key, value] : m2)\n std::cout << \"[\" << key << \", \" << value << \"]\" << std::endl;\n}\n"}], "page_id": ["reference", "node_handle", "node_handle"]}">
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最終更新日時(UTC):
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2025年07月11日 17時16分44秒
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<div class="identifier-type">class template</div><h1 itemprop="name"><span class="token">node_handle</span><span class="cpp cpp17" title="C++17で追加">(C++17)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o"><</span><span class="n">unspecified</span><span class="o">></span>
<span class="k">class</span><span class="w"> </span><span class="nc">node_handle</span><span class="p">;</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>クラス<code>node_handle</code>の名前は<a class="cpprefjp-defined-word" data-desc="未規定の動作。事前の断りなく処理系によって異なる動作をする" href="../../implementation-compliance.html#dfn-unspecified-behavior">未規定</a>だが、説明のために名前<code>node_handle</code>を用いる。</p>
<p>ノードハンドルは、連想コンテナ<code><a href="../set/set.html">std::set</a></code>、<code><a href="../set/multiset.html">std::multiset</a></code>、<code><a href="../map/map.html">std::map</a></code>、<code><a href="../map/multimap.html">std::multimap</a></code>またはunordered連想コンテナ<code><a href="../unordered_set/unordered_set.html">std::unordered_set</a></code>、<code><a href="../unordered_set/unordered_multiset.html">std::unordered_multiset</a></code>、<code><a href="../unordered_map/unordered_map.html">std::unordered_map</a></code>、<code><a href="../unordered_map/unordered_multimap.html">std::unordered_multimap</a></code>から単一要素の所有権を受け取るオブジェクトである。</p>
<p>互換性のあるノードを持つ別のコンテナにその所有権を移すために使用される。
互換性のあるノードを持つコンテナは、同じノードハンドル型を持つ。</p>
<p>要素は、次の表の同じ行にあるコンテナ型間でどちらの方向にも転送できる。</p>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><code>map<K, T, C1, A></code></td>
<td><code>map<K, T, C2, A></code></td>
</tr>
<tr>
<td><code>map<K, T, C1, A></code></td>
<td><code>multimap<K, T, C2, A></code></td>
</tr>
<tr>
<td><code>set<K, C1, A></code></td>
<td><code>set<K, C2, A></code></td>
</tr>
<tr>
<td><code>set<K, C1, A></code></td>
<td><code>multiset<K, C2, A></code></td>
</tr>
<tr>
<td><code>unordered_map<K, T, H1, E1, A></code></td>
<td><code>unordered_map<K, T, H2, E2, A></code></td>
</tr>
<tr>
<td><code>unordered_map<K, T, H1, E1, A></code></td>
<td><code>unordered_multimap<K, T, H2, E2, A></code></td>
</tr>
<tr>
<td><code>unordered_set<K, H1, E1, A></code></td>
<td><code>unordered_set<K, H2, E2, A></code></td>
</tr>
<tr>
<td><code>unordered_set<K, H1, E1, A></code></td>
<td><code>unordered_multiset<K, H2, E2, A></code></td>
</tr>
</tbody>
</table>
<p>ノードハンドルが空でない場合は、要素が抽出されたときのコンテナのアロケータと等しいアロケータが含まれる。ノードハンドルが空の場合、アロケータは含まれない。</p>
<p><code>key_type</code> を <code>K</code>、 <code>mapped_type</code> を <code>T</code> としたとき、<code>std::pair<K, T></code>または<code>std::pair<const K, T></code>に対する<a class="cpprefjp-defined-word" data-desc="プログラム定義。ユーザー（プログラマ）によって定義されること（標準ライブラリで定義されるものを除く）">ユーザー定義</a>の特殊化が存在する場合、ノードハンドルを用いる操作は<a class="cpprefjp-defined-word" data-desc="未定義の動作。処理系は予期せぬ動作をする可能性がある。要するに動作保証対象外。undefined behavior (UB)。" href="../../implementation-compliance.html#dfn-undefined-behavior">未定義動作</a>を引き起こす。</p>
<p>また、<code>node_handle</code>はムーブオンリーである。</p>
<h2>メンバ関数</h2>
<h3>構築・破棄</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="node_handle/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td>C++17</td>
</tr>
<tr>
<td><code><a href="node_handle/op_destructor.html">(destructor)</a></code></td>
<td>デストラクタ</td>
<td>C++17</td>
</tr>
<tr>
<td><code><a href="node_handle/op_assign.html">operator=</a></code></td>
<td>代入演算子</td>
<td>C++17</td>
</tr>
</tbody>
</table>
<h3>オブザーバー</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="node_handle/value.html">value</a></code>(set)</td>
<td>要素アクセス</td>
<td>C++17</td>
</tr>
<tr>
<td><code><a href="node_handle/key.html">key</a></code>(map)</td>
<td>キーアクセス</td>
<td>C++17</td>
</tr>
<tr>
<td><code><a href="node_handle/mapped.html">mapped</a></code>(map)</td>
<td>値アクセス</td>
<td>C++17</td>
</tr>
<tr>
<td><code><a href="node_handle/get_allocator.html">get_allocator</a></code></td>
<td>アロケータオブジェクトの取得</td>
<td>C++17</td>
</tr>
<tr>
<td><code><a href="node_handle/op_bool.html">operator bool</a></code></td>
<td>ノードハンドルが空であるかどうかを調べる</td>
<td>C++17</td>
</tr>
<tr>
<td><code><a href="node_handle/empty.html">empty</a></code></td>
<td>ノードハンドルが空であるかどうかを調べる</td>
<td>C++17</td>
</tr>
</tbody>
</table>
<h3>変更</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="node_handle/swap.html">swap</a></code></td>
<td>2つの<code>node_handle</code>オブジェクトを入れ替える</td>
<td>C++17</td>
</tr>
</tbody>
</table>
<h2>メンバ型</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>key_type</code></td>
<td>テンプレートパラメータ <code>K</code>。</td>
<td>C++17</td>
</tr>
<tr>
<td><code>value_type</code>(set)</td>
<td>テンプレートパラメータ <code>K</code>。</td>
<td>C++17</td>
</tr>
<tr>
<td><code>value_type</code>(map)</td>
<td>要素の型。<code>std::<a href="../utility/pair.html">pair</a><const K, T></code>。</td>
<td>C++17</td>
</tr>
<tr>
<td><code>mapped_type</code>(map)</td>
<td>値の型。テンプレートパラメータ <code>T</code>。</td>
<td>C++17</td>
</tr>
<tr>
<td><code>allocator_type</code></td>
<td>アロケータの型。</td>
<td>C++17</td>
</tr>
</tbody>
</table>
<h2>非メンバ関数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="node_handle/swap_free.html">swap</a></code></td>
<td>2つの<code>node_handle</code>オブジェクトを入れ替える</td>
<td>C++17</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="06bca4a1a7a41e8c01ea8700933a54290cd6e69f"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../map.html"><map></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// char をキー、int を値として扱う連想配列</span>
<span class="w"> </span><span class="n"><a href="../map/map.html">std::map</a></span><span class="o"><</span><span class="kt">char</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">m1</span><span class="p">,</span><span class="w"> </span><span class="n">m2</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// m1 へ挿入</span>
<span class="w"> </span><span class="n">m1</span><span class="p">.</span><span class="n">insert</span><span class="p">(</span><span class="n"><a href="../utility/make_pair.html">std::make_pair</a></span><span class="p">(</span><span class="sc">'a'</span><span class="p">,</span><span class="w"> </span><span class="mi">10</span><span class="p">));</span>
<span class="w"> </span><span class="n">m1</span><span class="p">.</span><span class="n">insert</span><span class="p">(</span><span class="n"><a href="../utility/make_pair.html">std::make_pair</a></span><span class="p">(</span><span class="sc">'b'</span><span class="p">,</span><span class="w"> </span><span class="mi">20</span><span class="p">));</span>
<span class="w"> </span><span class="n">m1</span><span class="p">.</span><span class="n">insert</span><span class="p">(</span><span class="n"><a href="../utility/make_pair.html">std::make_pair</a></span><span class="p">(</span><span class="sc">'c'</span><span class="p">,</span><span class="w"> </span><span class="mi">30</span><span class="p">));</span>
<span class="w"> </span><span class="c1">// ノードを取得(要素は、コピーもムーブもされない)</span>
<span class="w"> </span><span class="c1">// なお、<span style="color:#ff0000">node_type</span> は node_handle の特殊化である</span>
<span class="w"> </span><span class="n"><a href="../map/map.html">std::map</a></span><span class="o"><</span><span class="kt">char</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">>::</span><span class="n"><span style="color:#ff0000">node_type</span></span><span class="w"> </span><span class="n">node</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">m1</span><span class="p">.</span><span class="n">extract</span><span class="p">(</span><span class="sc">'c'</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// m2 へ挿入(要素は、コピーもムーブもされない)</span>
<span class="w"> </span><span class="n">m2</span><span class="p">.</span><span class="n">insert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">node</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"m1 :"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">auto</span><span class="o">&</span><span class="w"> </span><span class="p">[</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="n">value</span><span class="p">]</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">m1</span><span class="p">)</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"["</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">key</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"]"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"m2 :"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">auto</span><span class="o">&</span><span class="w"> </span><span class="p">[</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="n">value</span><span class="p">]</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">m2</span><span class="p">)</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"["</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">key</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">", "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"]"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>m1 :
[a, 10]
[b, 20]
m2 :
[c, 30]
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++17</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 7.0.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 7.1.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2017 Update 5 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="../set/set.html">std::set</a></code></li>
<li><code><a href="../set/multiset.html">std::multiset</a></code></li>
<li><code><a href="../map/map.html">std::map</a></code></li>
<li><code><a href="../map/multimap.html">std::multimap</a></code></li>
<li><code><a href="../unordered_set/unordered_set.html">std::unordered_set</a></code></li>
<li><code><a href="../unordered_set/unordered_multiset.html">std::unordered_multiset</a></code></li>
<li><code><a href="../unordered_map/unordered_map.html">std::unordered_map</a></code></li>
<li><code><a href="../unordered_map/unordered_multimap.html">std::unordered_multimap</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0083r3.pdf" target="_blank">Splicing Maps and Sets(Revision 5)</a></li>
</ul></div>
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