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<header data-kunai-mdinfo="{"meta": {"header": ["list"], "namespace": ["std"], "id-type": ["class template"]}, "sources": [{"id": "520400c79d41722da3fe670d9a5a834cb26cea2c", "source": "#include <iostream>\n#include <list>\n#include <algorithm>\n\nint main ()\n{\n std::list<int> ls;\n\n // \u5148\u982d\u304b\u3089\u8981\u7d20\u3092\u8ffd\u52a0\n ls.push_front(1);\n ls.push_front(2);\n\n // \u672b\u5c3e\u304b\u3089\u8981\u7d20\u3092\u8ffd\u52a0\n ls.push_back(3);\n ls.push_back(4);\n\n // \u8981\u7d20\u3092\u5148\u982d\u304b\u3089\u9806\u756a\u306b\u8868\u793a\n std::for_each(ls.cbegin(), ls.cend(), [](int x){\n std::cout << x << \" \";\n });\n}\n"}, {"id": "146d840445919b99d3e77bc716cf0b53fb904c77", "source": "#include <iostream>\n#include <list>\n#include <string>\n\n//\u7c21\u6613\u306a\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u69cb\u9020\u8868\u73fe\u30af\u30e9\u30b9\nclass directory {\n\n //\u4e0d\u5b8c\u5168\u578b\uff08\u30af\u30e9\u30b9\u5b9a\u7fa9\u5185\u3067\u306f\u305d\u306e\u30af\u30e9\u30b9\u81ea\u8eab\u306f\u4e0d\u5b8c\u5168\uff09\u3092\u8981\u7d20\u578b\u306b\u6307\u5b9a\n std::list<directory> m_subdir{};\n std::string m_name{};\n\npublic:\n\n directory(const char* name) : m_name{name}\n {}\n\n //\u30b5\u30d6\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u8ffd\u52a0\n template<typename Dir>\n void add(Dir&& dir) {\n m_subdir.emplace_back(std::forward<Dir>(dir));\n }\n\n //\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u540d\u53d6\u5f97\n auto get() const -> const std::string& {\n return m_name;\n }\n\n auto begin() const {\n return m_subdir.begin();\n }\n\n auto end() const {\n return m_subdir.end();\n }\n};\n\n//\u30eb\u30fc\u30c8\u3088\u308a\u4e0b\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u3064\u3044\u3066\u6574\u5f62\u3057\u3066\u51fa\u529b\nvoid recursive_out(const directory& dir, unsigned int depth) {\n\n if (1 < depth) std::cout << \"| \";\n for (auto i = depth; 2 < i; --i) {\n std::cout << \" \";\n }\n if (2 < depth) std::cout << \" \";\n\n std::cout << \"|-\" << dir.get() << std::endl;\n\n for (auto& subdir : dir) {\n recursive_out(subdir, depth + 1);\n }\n}\n\n//\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u69cb\u9020\u3092\u51fa\u529b\u3059\u308b\nvoid out_directorytree(const directory& dir) {\n std::cout << dir.get() << std::endl;\n\n for (auto& subdir : dir) {\n recursive_out(subdir, 1);\n }\n}\n\nint main() {\n directory dir{\"root\"};\n dir.add(\"sub1\");\n\n directory sub2{\"sub2\"};\n sub2.add(\"sub2.1\");\n\n directory sub22{\"sub2.2\"};\n sub22.add(\"sub2.2.1\");\n\n sub2.add(std::move(sub22));\n\n dir.add(std::move(sub2));\n dir.add(\"sub3\");\n\n out_directorytree(dir);\n}\n"}], "page_id": ["reference", "list", "list"]}">
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<p class="text-right"><small>
最終更新日時(UTC):
<span itemprop="datePublished" content="2025-07-11T17:16:44">
2025年07月11日 17時16分44秒
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
<span itemprop="name">Koichi Murase</span>
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が更新
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<div class="identifier-type">class template</div><div class="header"><list></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">list</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../memory/allocator.html">allocator</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="o">></span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">list</span><span class="p">;</span>
<span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">pmr</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="">std::list</a></span><span class="o"><</span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../memory_resource/polymorphic_allocator.html">polymorphic_allocator</a></span><span class="o"><</span><span class="n">T</span><span class="o">>></span><span class="p">;</span><span class="w"> </span><span class="c1">// C++17から</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>list</code>は、双方向リンクリストのデータ構造をもつクラスである。</p>
<p>任意の位置への挿入や削除を定数時間で行う事が出来るが、高速なランダムアクセスは出来ず、常にシーケンシャルアクセスを行う必要がある。</p>
<p>テンプレートパラメータは、以下を意味する：</p>
<ul>
<li><code>T</code>: 格納される要素の型、C++17以降は<a class="cpprefjp-defined-word" data-desc="型のサイズを決定できない、完全には定義されていない型。例えば先行宣言のみのクラス型、要素数不明の配列型、`void`など。クラス定義内部ではそのクラス自身は不完全型">不完全型</a>をサポートしている</li>
<li><code>Allocator</code>: メモリ確保に使用されるアロケータの型。デフォルトでは標準の<code><a href="../memory/allocator.html">allocator</a></code>クラスが使用される。</li>
</ul>
<h2>メンバ関数</h2>
<h3>構築／コピー／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="list/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/op_destructor.html">(destructor)</a></code></td>
<td>デストラクタ</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/op_assign.html">operator=</a></code></td>
<td>代入演算子</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/assign.html">assign</a></code></td>
<td>コンテナの再代入</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/assign_range.html">assign_range</a></code></td>
<td>Rangeの要素を再代入</td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h3>イテレータ</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="list/begin.html">begin</a></code></td>
<td>先頭要素を指すイテレータを取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/end.html">end</a></code></td>
<td>末尾の次を指すイテレータを取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/cbegin.html">cbegin</a></code></td>
<td>先頭要素を指す読み取り専用イテレータを取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="list/cend.html">cend</a></code></td>
<td>末尾の次を指す読み取り専用イテレータを取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="list/rbegin.html">rbegin</a></code></td>
<td>末尾を指す逆イテレータを取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/rend.html">rend</a></code></td>
<td>先頭の前を指す逆イテレータを取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/crbegin.html">crbegin</a></code></td>
<td>末尾を指す読み取り専用逆イテレータを取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="list/crend.html">crend</a></code></td>
<td>先頭の前を指す読み取り専用逆イテレータを取得する</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h3>領域</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="list/empty.html">empty</a></code></td>
<td>コンテナが空かどうかを判定する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/size.html">size</a></code></td>
<td>要素数を取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/max_size.html">max_size</a></code></td>
<td>格納可能な最大の要素数を取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/resize.html">resize</a></code></td>
<td>要素数を変更する</td>
<td></td>
</tr>
</tbody>
</table>
<h3>要素アクセス</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="list/front.html">front</a></code></td>
<td>先頭要素への参照を取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/back.html">back</a></code></td>
<td>末尾要素への参照を取得する</td>
<td></td>
</tr>
</tbody>
</table>
<h3>コンテナの変更</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="list/push_front.html">push_front</a></code></td>
<td>先頭に要素を追加する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/emplace_front.html">emplace_front</a></code></td>
<td>先頭への直接構築による要素追加</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="list/prepend_range.html">prepend_range</a></code></td>
<td>先頭にRangeの要素を追加する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="list/push_back.html">push_back</a></code></td>
<td>末尾に要素を追加する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/emplace_back.html">emplace_back</a></code></td>
<td>末尾への直接構築による要素追加</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="list/append_range.html">append_range</a></code></td>
<td>末尾にRangeの要素を追加する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="list/insert.html">insert</a></code></td>
<td>要素の挿入</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/emplace.html">emplace</a></code></td>
<td>要素の直接構築による挿入</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="list/insert_range.html">insert_range</a></code></td>
<td>任意の位置にRangeの要素を挿入する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="list/pop_front.html">pop_front</a></code></td>
<td>先頭から要素を削除</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/pop_back.html">pop_back</a></code></td>
<td>末尾から要素を削除</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/erase.html">erase</a></code></td>
<td>要素の削除</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/clear.html">clear</a></code></td>
<td>全要素削除</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/swap.html">swap</a></code></td>
<td>コンテナの交換</td>
<td></td>
</tr>
</tbody>
</table>
<h3>リスト操作</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="list/splice.html">splice</a></code></td>
<td>他のコンテナから要素を移動する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/remove.html">remove</a></code></td>
<td>コンテナから指定された値の要素を削除する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/remove_if.html">remove_if</a></code></td>
<td>コンテナの条件に合った要素を削除する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/unique.html">unique</a></code></td>
<td>重複した要素をコンテナから削除する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/merge.html">merge</a></code></td>
<td>2つのコンテナを併合する</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/sort.html">sort</a></code></td>
<td>コンテナを並べ替える</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/reverse.html">reverse</a></code></td>
<td>コンテナを反転する</td>
<td></td>
</tr>
</tbody>
</table>
<h3>アロケータ</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="list/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></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>reference</code></td>
<td><code>value_type&</code></td>
<td></td>
</tr>
<tr>
<td><code>const_reference</code></td>
<td><code>const value_type&</code></td>
<td></td>
</tr>
<tr>
<td><code>iterator</code></td>
<td>双方向イテレータ</td>
<td></td>
</tr>
<tr>
<td><code>const_iterator</code></td>
<td>読み取り専用双方向イテレータ</td>
<td></td>
</tr>
<tr>
<td><code>size_type</code></td>
<td>符号なし整数型(通常は<code><a href="../cstddef/size_t.html">size_t</a></code>)</td>
<td></td>
</tr>
<tr>
<td><code>difference_type</code></td>
<td>符号付き整数型(通常は<code><a href="../cstddef/ptrdiff_t.html">ptrdiff_t</a></code>)</td>
<td></td>
</tr>
<tr>
<td><code>value_type</code></td>
<td><code>T</code></td>
<td></td>
</tr>
<tr>
<td><code>allocator_type</code></td>
<td><code>Allocator</code></td>
<td></td>
</tr>
<tr>
<td><code>pointer</code></td>
<td><code><a href="../memory/allocator_traits.html">allocator_traits</a><Allocator>::pointer</code></td>
<td></td>
</tr>
<tr>
<td><code>const_pointer</code></td>
<td><code><a href="../memory/allocator_traits.html">allocator_traits</a><Allocator>::const_pointer</code></td>
<td></td>
</tr>
<tr>
<td><code>reverse_iterator</code></td>
<td><code>std::<a href="../iterator/reverse_iterator.html">reverse_iterator</a><iterator></code></td>
<td></td>
</tr>
<tr>
<td><code>const_reverse_iterator</code></td>
<td><code>std::<a href="../iterator/reverse_iterator.html">reverse_iterator</a><const_iterator></code></td>
<td></td>
</tr>
</tbody>
</table>
<h2>非メンバ関数</h2>
<h3>比較演算子</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="list/op_equal.html">operator==</a></code></td>
<td>等値比較</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/op_not_equal.html">operator!=</a></code></td>
<td>非等値比較</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/op_compare_3way.html">operator<=></a></code></td>
<td>三方比較</td>
<td>C++20</td>
</tr>
<tr>
<td><code><a href="list/op_less.html">operator<</a></code></td>
<td>左辺が右辺より小さいかの判定を行う</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/op_less_equal.html">operator<=</a></code></td>
<td>左辺が右辺以下かの判定を行う</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/op_greater.html">operator></a></code></td>
<td>左辺が右辺より大きいかの判定を行う</td>
<td></td>
</tr>
<tr>
<td><code><a href="list/op_greater_equal.html">operator>=</a></code></td>
<td>左辺が右辺以上かの判定を行う</td>
<td></td>
</tr>
</tbody>
</table>
<h3>入れ替え</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="list/swap_free.html">swap</a></code></td>
<td>2つの<code>list</code>オブジェクトを入れ替える</td>
<td></td>
</tr>
</tbody>
</table>
<h3>要素削除</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="list/erase_free.html">erase</a></code></td>
<td>指定した値をもつ要素とその分の領域を、コンテナから削除する</td>
<td>C++20</td>
</tr>
<tr>
<td><code><a href="list/erase_if_free.html">erase_if</a></code></td>
<td>指定した条件に合致する要素とその分の領域を、コンテナから削除する</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h2>推論補助</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="list/op_deduction_guide.html">(deduction_guide)</a></code></td>
<td>クラステンプレートの推論補助</td>
<td>C++17</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<h3>基本的な使い方</h3>
<p><div class="yata" id="520400c79d41722da3fe670d9a5a834cb26cea2c"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../list.html"><list></a></span>
<span class="cp">#include <a href="../algorithm.html"><algorithm></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="w"> </span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::list</span></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">ls</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 先頭から要素を追加</span>
<span class="w"> </span><span class="n"><a href="list/push_front.html">ls.push_front</a></span><span class="p">(</span><span class="mi">1</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="list/push_front.html">ls.push_front</a></span><span class="p">(</span><span class="mi">2</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 末尾から要素を追加</span>
<span class="w"> </span><span class="n"><a href="list/push_back.html">ls.push_back</a></span><span class="p">(</span><span class="mi">3</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="list/push_back.html">ls.push_back</a></span><span class="p">(</span><span class="mi">4</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 要素を先頭から順番に表示</span>
<span class="w"> </span><span class="n"><a href="../algorithm/for_each.html">std::for_each</a></span><span class="p">(</span><span class="n"><a href="list/cbegin.html">ls.cbegin()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="list/cend.html">ls.cend()</a></span><span class="p">,</span><span class="w"> </span><span class="p">[](</span><span class="kt">int</span><span class="w"> </span><span class="n">x</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="n">x</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" "</span><span class="p">;</span>
<span class="w"> </span><span class="p">});</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>2 1 3 4
</code></pre></p>
<h3><a class="cpprefjp-defined-word" data-desc="型のサイズを決定できない、完全には定義されていない型。例えば先行宣言のみのクラス型、要素数不明の配列型、`void`など。クラス定義内部ではそのクラス自身は不完全型">不完全型</a>を要素にする例 (C++17)</h3>
<p><a class="cpprefjp-defined-word" data-desc="型のサイズを決定できない、完全には定義されていない型。例えば先行宣言のみのクラス型、要素数不明の配列型、`void`など。クラス定義内部ではそのクラス自身は不完全型">不完全型</a>を要素型に出来るようになった事で、階層構造や多分木などの再帰的データ構造を実装することが容易になる。<br />
他にも、<code><a href="../vector/vector.html">vector</a></code>と<code><a href="../forward_list/forward_list.html">forward_list</a></code>が<a class="cpprefjp-defined-word" data-desc="型のサイズを決定できない、完全には定義されていない型。例えば先行宣言のみのクラス型、要素数不明の配列型、`void`など。クラス定義内部ではそのクラス自身は不完全型">不完全型</a>をサポートしている。</p>
<p><div class="yata" id="146d840445919b99d3e77bc716cf0b53fb904c77"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../list.html"><list></a></span>
<span class="cp">#include <a href="../string.html"><string></a></span>
<span class="c1">//簡易なディレクトリ構造表現クラス</span>
<span class="k">class</span><span class="w"> </span><span class="nc">directory</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="c1">//不完全型（クラス定義内ではそのクラス自身は不完全）を要素型に指定</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::list</span></span><span class="o"><</span><span class="n">directory</span><span class="o">></span><span class="w"> </span><span class="n">m_subdir</span><span class="p">{};</span>
<span class="w"> </span><span class="n"><a href="../string/basic_string.html">std::string</a></span><span class="w"> </span><span class="n">m_name</span><span class="p">{};</span>
<span class="k">public</span><span class="o">:</span>
<span class="w"> </span><span class="n">directory</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">name</span><span class="p">)</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">m_name</span><span class="p">{</span><span class="n">name</span><span class="p">}</span>
<span class="w"> </span><span class="p">{}</span>
<span class="w"> </span><span class="c1">//サブディレクトリ追加</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">Dir</span><span class="o">></span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="n">add</span><span class="p">(</span><span class="n">Dir</span><span class="o">&&</span><span class="w"> </span><span class="n">dir</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">m_subdir</span><span class="p">.</span><span class="n"><a href="list/emplace_back.html">emplace_back</a></span><span class="p">(</span><span class="n"><a href="../utility/forward.html">std::forward</a></span><span class="o"><</span><span class="n">Dir</span><span class="o">></span><span class="p">(</span><span class="n">dir</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">//ディレクトリ名取得</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">get</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../string/basic_string.html">std::string</a></span><span class="o">&</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">m_name</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n"><a href="list/begin.html">begin</a></span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">m_subdir</span><span class="p">.</span><span class="n"><a href="list/begin.html">begin</a></span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n"><a href="list/end.html">end</a></span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">m_subdir</span><span class="p">.</span><span class="n"><a href="list/end.html">end</a></span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">};</span>
<span class="c1">//ルートより下のディレクトリについて整形して出力</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">recursive_out</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">directory</span><span class="o">&</span><span class="w"> </span><span class="n">dir</span><span class="p">,</span><span class="w"> </span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">depth</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">depth</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="p">;</span>
<span class="w"> </span><span class="n"><a href="../../lang/cpp11/range_based_for.html">for</a></span><span class="w"> </span><span class="p">(</span><span class="k">auto</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">depth</span><span class="p">;</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">i</span><span class="p">;</span><span class="w"> </span><span class="o">--</span><span class="n">i</span><span class="p">)</span><span class="w"> </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="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="mi">2</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">depth</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="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">dir</span><span class="p">.</span><span class="n">get</span><span class="p">()</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="../../lang/cpp11/range_based_for.html">for</a></span><span class="w"> </span><span class="p">(</span><span class="k">auto</span><span class="o">&</span><span class="w"> </span><span class="n">subdir</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">dir</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">recursive_out</span><span class="p">(</span><span class="n">subdir</span><span class="p">,</span><span class="w"> </span><span class="n">depth</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
<span class="c1">//ディレクトリ構造を出力する</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">out_directorytree</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">directory</span><span class="o">&</span><span class="w"> </span><span class="n">dir</span><span class="p">)</span><span class="w"> </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="n">dir</span><span class="p">.</span><span class="n">get</span><span class="p">()</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="../../lang/cpp11/range_based_for.html">for</a></span><span class="w"> </span><span class="p">(</span><span class="k">auto</span><span class="o">&</span><span class="w"> </span><span class="n">subdir</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">dir</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">recursive_out</span><span class="p">(</span><span class="n">subdir</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">directory</span><span class="w"> </span><span class="n">dir</span><span class="p">{</span><span class="s">"root"</span><span class="p">};</span>
<span class="w"> </span><span class="n">dir</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="s">"sub1"</span><span class="p">);</span>
<span class="w"> </span><span class="n">directory</span><span class="w"> </span><span class="n">sub2</span><span class="p">{</span><span class="s">"sub2"</span><span class="p">};</span>
<span class="w"> </span><span class="n">sub2</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="s">"sub2.1"</span><span class="p">);</span>
<span class="w"> </span><span class="n">directory</span><span class="w"> </span><span class="n">sub22</span><span class="p">{</span><span class="s">"sub2.2"</span><span class="p">};</span>
<span class="w"> </span><span class="n">sub22</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="s">"sub2.2.1"</span><span class="p">);</span>
<span class="w"> </span><span class="n">sub2</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n"><a href="../utility/move.html">std::move</a></span><span class="p">(</span><span class="n">sub22</span><span class="p">));</span>
<span class="w"> </span><span class="n">dir</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n"><a href="../utility/move.html">std::move</a></span><span class="p">(</span><span class="n">sub2</span><span class="p">));</span>
<span class="w"> </span><span class="n">dir</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="s">"sub3"</span><span class="p">);</span>
<span class="w"> </span><span class="n">out_directorytree</span><span class="p">(</span><span class="n">dir</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>root
|-sub1
|-sub2
| |-sub2.1
| |-sub2.2
| |-sub2.2.1
|-sub3
</code></pre></p>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2669.htm" target="_blank">N2669 Thread-Safety in the Standard Library (Rev 2)</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4510.html" target="_blank">N4510 Minimal incomplete type support for standard containers, revision 4</a></li>
</ul></div>
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