90 lines
7.5 KiB
HTML
90 lines
7.5 KiB
HTML
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<title>std::filesystem::recursive_directory_iterator::depth</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::filesystem::recursive_directory_iterator::</span>depth</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-filesystem.html">filesystem</a>‎ | <a href="cpp-filesystem-recursive_directory_iterator.html">recursive directory iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> depth<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p>返回从起始目录到当前被迭代目录的目录层数,即目录层级的当前深度。</p>
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<p>起始目录拥有深度 <span class="texhtml" style="white-space: nowrap;">0</span> ,其子目录拥有深度 <span class="texhtml" style="white-space: nowrap;">1</span> ,以此类推。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 是尾迭代器则行为未定义。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<p>(无)</p>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>目录层级的当前深度。</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不抛出。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<p>此示例用迭代深度计算目录树打印的缩进</p>
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <fstream></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <filesystem></span>
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<span class="kw1">namespace</span> fs <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">filesystem</span><span class="sy4">;</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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fs<span class="sy4">::</span><span class="me2">current_path</span><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">temp_directory_path</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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fs<span class="sy4">::</span><span class="me2">create_directories</span><span class="br0">(</span><span class="st0">"sandbox/a/b/c"</span><span class="br0">)</span><span class="sy4">;</span>
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fs<span class="sy4">::</span><span class="me2">create_directories</span><span class="br0">(</span><span class="st0">"sandbox/a/b/d/e"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a><span class="br0">(</span><span class="st0">"sandbox/a/b/file1.txt"</span><span class="br0">)</span><span class="sy4">;</span>
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fs<span class="sy4">::</span><span class="me2">create_symlink</span><span class="br0">(</span><span class="st0">"a"</span>, <span class="st0">"sandbox/syma"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span><span class="br0">(</span><span class="kw4">auto</span> i <span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">recursive_directory_iterator</span><span class="br0">(</span><span class="st0">"sandbox"</span><span class="br0">)</span><span class="sy4">;</span>
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i <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">recursive_directory_iterator</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="sy2">++</span>i <span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="br0">(</span>i.<span class="me1">depth</span><span class="br0">(</span><span class="br0">)</span>, <span class="st0">' '</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="sy2">*</span>i<span class="sy4">;</span>
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<span class="kw1">if</span><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">is_symlink</span><span class="br0">(</span>i<span class="sy2">-</span><span class="sy1">></span>symlink_status<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">" -> "</span> <span class="sy1"><<</span> fs<span class="sy4">::</span><span class="me2">read_symlink</span><span class="br0">(</span><span class="sy2">*</span>i<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span>
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fs<span class="sy4">::</span><span class="me2">remove_all</span><span class="br0">(</span><span class="st0">"sandbox"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出:</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">"sandbox/a"
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"sandbox/a/b"
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"sandbox/a/b/c"
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"sandbox/a/b/d"
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"sandbox/a/b/d/e"
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"sandbox/a/b/file1.txt"
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"sandbox/syma" -> "a"</pre></div>
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