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‎reference/filesystem/path.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="2024-06-11T13:45:38">
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2024年06月11日 13時45分38秒
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<span itemprop="datePublished" content="2025-03-03T04:59:58">
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2025年03月03日 04時59分58秒
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</span>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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</tr>
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</tbody>
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</table>
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<h2>文字列フォーマットサポート</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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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code><a href="path/formatter.html">formatter</a></code></td>
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<td><code><a href="../format/formatter.html">std::formatter</a></code>クラスの特殊化</td>
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<td>C++26</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>POSIXベースシステムの例</h3>
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<p><div class="yata" id="14348e5d7ceb054567553a88818adf1b31dc1d46"><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/filesystem/path/formatter.html‎

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;filesystem&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;class&#34;], &#34;cpp&#34;: [&#34;cpp26&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;2dc8a9e64142e58320fd6f8a88de06217f7f2e5f&#34;, &#34;source&#34;: &#34;#include &lt;print&gt;\n#include &lt;filesystem&gt;\n\nnamespace fs = std::filesystem;\n\nint main() {\n fs::path a = \&#34;/a/b/c.txt\&#34;;\n fs::path b = \&#34;multi\\nline\&#34;;\n fs::path c = \&#34;a\\\\b\\\\c.txt\&#34;;\n\n // \u30c7\u30d5\u30a9\u30eb\u30c8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306f\u3001operator&lt;&lt;\u3068\u3061\u304c\u3063\u3066\n // \u5f15\u7528\u7b26\u3067\u56f2\u307e\u305a\u306b\u51fa\u529b\u3059\u308b\n std::println(\&#34;1 : {}\&#34;, a);\n\n // \u30c7\u30d0\u30c3\u30b0\u51fa\u529b\u3002\n // \u5f15\u7528\u7b26\u3067\u56f2\u307f\u3001\u30a8\u30b9\u30b1\u30fc\u30d7\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u30a8\u30b9\u30b1\u30fc\u30d7\u3057\u3066\u51fa\u529b\u3059\u308b\n std::println(\&#34;2 : {:?}\&#34;, a);\n std::println(\&#34;3 : {:?}\&#34;, b);\n\n // \u74b0\u5883\u975e\u4f9d\u5b58\u306e\u30d1\u30b9\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\n std::println(\&#34;4 : {:g}\&#34;, c);\n std::println(\&#34;5 : {}\&#34;, c);\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;filesystem&#34;, &#34;path&#34;, &#34;formatter&#34;]}">
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-03-03T04:59:58">
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2025年03月03日 04時59分58秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">Akira Takahashi</span>
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</span>
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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 class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/filesystem/path/formatter.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">class</div><div class="header">&lt;filesystem&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">formatter</span><span class="cpp cpp26" title="C++26で追加">(C++26)</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">charT</span><span class="o">&gt;</span>
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<span class="k">struct</span> <span class="n">formatter</span><span class="o">&lt;</span><span class="n">filesystem</span><span class="o">::</span><span class="n">path</span><span class="p">,</span> <span class="n">charT</span><span class="o">&gt;</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>filesystem::path</code>クラスに対する<code><a href="../../format/formatter.html">std::formatter</a></code>クラステンプレートの特殊化。</p>
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<p>書式としては、以下を使用できる：</p>
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<p><pre><code>[[fill] align] [width] [?] [g]
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</code></pre></p>
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<ul>
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<li><code>fill</code> : アライメントに使う文字 (デフォルト: スペース)</li>
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<li><code>align</code> : アライメント(デフォルトは型による)<ul>
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<li><code>&gt;</code> : 右寄せ</li>
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<li><code>&lt;</code> : 左寄せ</li>
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<li><code>^</code> : 中央寄せ</li>
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</ul>
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</li>
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<li><code>width</code> : 幅 (アライメントもしくは0埋めの幅)<ul>
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<li>置換フィールドを使って変数で指定できる</li>
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</ul>
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</li>
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<li><code>?</code> : デバッグ出力<ul>
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<li>文字・文字列を引用符で囲み、エスケープシーケンスをエスケープして出力</li>
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</ul>
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</li>
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<li><code>g</code> : 環境非依存のパスフォーマット (<code><a href="generic_string.html">generic_string()</a></code>) を使用する<ul>
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<li>これが指定されない場合は、プラットフォームごとのパスフォーマット (<code><a href="native.html">native()</a></code>) を使用する</li>
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</ul>
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</li>
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</ul>
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<h2>例</h2>
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<p><div class="yata" id="2dc8a9e64142e58320fd6f8a88de06217f7f2e5f"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../../print.html">&lt;print&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../../filesystem.html">&lt;filesystem&gt;</a></span><span class="cp"></span>
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<span class="k">namespace</span> <span class="n">fs</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">filesystem</span><span class="p">;</span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="n"><a href="../path.html">fs::path</a></span> <span class="n">a</span> <span class="o">=</span> <span class="s">"/a/b/c.txt"</span><span class="p">;</span>
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<span class="n"><a href="../path.html">fs::path</a></span> <span class="n">b</span> <span class="o">=</span> <span class="s">"multi</span><span class="se">\n</span><span class="s">line"</span><span class="p">;</span>
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<span class="n"><a href="../path.html">fs::path</a></span> <span class="n">c</span> <span class="o">=</span> <span class="s">"a</span><span class="se">\\</span><span class="s">b</span><span class="se">\\</span><span class="s">c.txt"</span><span class="p">;</span>
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<span class="c1">// デフォルトフォーマットは、operator&lt;&lt;とちがって</span>
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<span class="c1">// 引用符で囲まずに出力する</span>
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<span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"1 : {}"</span><span class="p">,</span> <span class="n">a</span><span class="p">);</span>
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<span class="c1">// デバッグ出力。</span>
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<span class="c1">// 引用符で囲み、エスケープシーケンスをエスケープして出力する</span>
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<span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"2 : {:?}"</span><span class="p">,</span> <span class="n">a</span><span class="p">);</span>
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<span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"3 : {:?}"</span><span class="p">,</span> <span class="n">b</span><span class="p">);</span>
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<span class="c1">// 環境非依存のパスフォーマット</span>
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<span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"4 : {:g}"</span><span class="p">,</span> <span class="n">c</span><span class="p">);</span>
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<span class="n"><a href="../../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"5 : {}"</span><span class="p">,</span> <span class="n">c</span><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>出力例</h3>
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<p><pre><code>1. /a/b/c.txt
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2. "/a/b/c.txt"
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3. "multi\nline"
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4. a/b/c.txt
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5. a\b\c.txt
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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++26</li>
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<h3>処理系</h3>
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<li><a href="../../../implementation.html#clang">Clang</a>: 20.0 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../../implementation.html#gcc">GCC</a>: 14 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: 2022 Update 10 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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</ul>
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<h2>関連項目</h2>
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<ul>
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<li><code><a href="../../format/format.html">std::format()</a></code> (フォーマットの詳細)</li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2845r8.html" target="_blank">P2845R8 Formatting of <code>std::filesystem::path</code></a></li>
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