96 lines
7.4 KiB
HTML
96 lines
7.4 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<title>std::filesystem::path::begin, std::filesystem::path::end</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_filesystem_path_begin skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>begin, <span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>end</h1>
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<div id="bodyContent">
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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-path.html">path</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dcl t-since-cxx17">
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx17">
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<div class="t-li1"><span class="t-li">1)</span> 返回指向路径首元素的迭代器。若路径为空，则返回的迭代器等于 <span class="t-lc"><strong class="selflink">end()</strong></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 返回路径最后元素后一位的迭代器。解引用此迭代器是未定义行为。</div>
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<p>这对迭代器所指代的序列由下列内容组成：</p>
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<ol>
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<li><span class="t-spar">根名</span> （若存在）</li>
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<li><span class="t-spar">根目录</span> （若存在）</li>
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<li><span class="t-spar">文件名</span> 的序列，忽略任何目录分隔符</li>
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<li>若在路径最后的 <span class="t-spar">文件名</span> 后有目录分隔符，则尾迭代器前的最后元素是空元素。</li>
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</ol>
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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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<div class="t-li1"><span class="t-li">1)</span> 指向路径首元素的迭代器。</div>
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<div class="t-li1"><span class="t-li">2)</span> 路径结束后一位的迭代器。</div>
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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>可能抛出实现定义的异常。</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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<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 <iostream></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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<span class="kw4">const</span> fs<span class="sy4">::</span><span class="me2">path</span> p <span class="sy1">=</span>
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<span class="co2"># ifdef _WIN32</span>
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<span class="st0">"C:<span class="es1">\\</span>users<span class="es1">\\</span>abcdef<span class="es1">\\</span>AppData<span class="es1">\\</span>Local<span class="es1">\\</span>Temp<span class="es1">\\</span>"</span><span class="sy4">;</span>
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<span class="co2"># else</span>
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<span class="st0">"/home/user/.config/Cppcheck/Cppcheck-GUI.conf"</span><span class="sy4">;</span>
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<span class="co2"># endif</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">"Examining the path "</span> <span class="sy1"><<</span> p <span class="sy1"><<</span> <span class="st0">" through iterators gives<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">auto</span> it <span class="sy1">=</span> p.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> it <span class="sy3">!</span><span class="sy1">=</span> p.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>it<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="sy2">*</span>it <span class="sy1"><<</span> <span class="st0">" │ "</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></pre></div>
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</div>
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<p>可能的输出：</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">--- Windows ---
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Examining the path "C:\users\abcdef\AppData\Local\Temp\" through iterators gives
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"C:" │ "/" │ "users" │ "abcdef" │ "AppData" │ "Local" │ "Temp" │ "" │
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--- UNIX ---
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Examining the path "/home/user/.config/Cppcheck/Cppcheck-GUI.conf" through iterators gives
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"/" │ "home" │ "user" │ ".config" │ "Cppcheck" │ "Cppcheck-GUI.conf" │</pre></div>
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