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<div class="identifier-type">class</div><div class="header"><filesystem></div><h1 itemprop="name"><span class="namespace" title="namespace std::filesystem">std::filesystem::</span><span class="class" title="class path">path::</span><span class="token">iterator</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">namespace</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">filesystem</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">path</span><span class="o">::</span><span class="n">iterator</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>iterator</code>は、<code><a href="../path.html">path</a></code>クラスが保持する汎用フォーマットのパス文字列を、ディレクトリ区切りで走査するイテレータである。</p>
<ul>
<li>イテレータが指す値の型<code>value_type</code>は<code><a href="../path.html">path</a></code></li>
<li>このイテレータは、双方向イテレータの要件を満たす</li>
<li><code><a href="../path.html">path</a></code>オブジェクトに対して非<code>const</code>メンバ関数を呼び出すと、全てのイテレータと要素への参照が無効となる</li>
</ul>
<p>汎用フォーマットのパス名に対して、このイテレータは以下の順に横断する：</p>
<ul>
<li>ルート名要素 (含まれていれば)</li>
<li>ルートディレクトリ要素 (含まれていれば)</li>
<li>ファイル名まで各要素を進ませる (含まれていれば)</li>
<li>末尾に非ルートのディレクトリ区切り文字があれば空要素として走査する</li>
</ul>
<p>後方の横断 (backward traversal) は、前方横断 (forward traversal) の逆順に進む。</p>
<h2>例</h2>
<h3>POSIXベースシステムでの例</h3>
<p><div class="yata" id="df37ff37a92f5504f7a53c554d0e049d210bb751"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../../filesystem.html"><filesystem></a></span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">fs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">filesystem</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="p">{</span>
<span class="w"> </span><span class="n"><a href="../path.html">fs::path</a></span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"/usr/bin/clang"</span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../path.html">fs::path</a></span><span class="w"> </span><span class="n">element</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">p</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">element</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="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"><a href="../../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 複数の連続したスラッシュはひとつとみなされる</span>
<span class="w"> </span><span class="n"><a href="../path.html">fs::path</a></span><span class="w"> </span><span class="n">p2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"a////b"</span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../path.html">fs::path</a></span><span class="w"> </span><span class="n">element</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">p2</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">element</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="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>"/"
"usr"
"bin"
"clang"
"a"
"b"
</code></pre></p>
<h3>Windowsでの例</h3>
<p><div class="yata" id="a68f796d391b5b5a984ea8a16b3b4e571a2e4802"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../../filesystem.html"><filesystem></a></span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">fs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">filesystem</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="p">{</span>
<span class="w"> </span><span class="n"><a href="../path.html">fs::path</a></span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"C:/Program Files/a.txt"</span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../path.html">fs::path</a></span><span class="w"> </span><span class="n">element</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">p</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">element</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="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>"C:"
"/"
"Program Files"
"a.txt"
</code></pre></p>
<h3>パスの最後がディレクトリ区切り文字の場合の例</h3>
<p><div class="yata" id="4a699f216d45c2db5b890fe4fef639914752dc64"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../../filesystem.html"><filesystem></a></span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">fs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">filesystem</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="p">{</span>
<span class="w"> </span><span class="n"><a href="../path.html">fs::path</a></span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"/a/b/c/"</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="n"><a href="../path.html">fs::path</a></span><span class="o">&</span><span class="w"> </span><span class="n">element</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">p</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">element</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="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>"/"
"a"
"b"
"c"
""
</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>:</li>
<li><a href="../../../implementation.html#gcc">GCC</a>: 8.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: 2017 Update 7 <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="begin.html">path::begin()</a></code></li>
<li><code><a href="end.html">path::end()</a></code></li>
</ul></div>
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