98 lines
6.7 KiB
HTML
98 lines
6.7 KiB
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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<title>std::filesystem::path::stem</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_filesystem_path_stem 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>stem</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><span class="mw-geshi cpp source-cpp">path stem<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p>返回通用格式路径所标识的文件名，剥去其扩展名。</p>
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<p>返回从 <a href="cpp-filesystem-path-filename.html"><tt>filename()</tt></a> 的开始到不含最后一个句号（ <code><b>.</b></code> ）字符的子串，有下列例外：</p>
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<p>若文件名的首字符是句号，则忽略该句号（类似 ".profile" 的文件名不被当做扩展名）</p>
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<p>若文件名是特殊文件系统组分 <span class="t-spar">dot</span> 或 <span class="t-spar">dot-dot</span> ，或若它无句号，则函数返回整个 <a href="cpp-filesystem-path-filename.html"><tt>filename()</tt></a> 。</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>路径所标识的文件名的主干。</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>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="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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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">"/foo/bar.txt"</span><span class="br0">)</span>.<span class="me1">stem</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
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<span class="sy1"><<</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">"/foo/.bar"</span><span class="br0">)</span>.<span class="me1">stem</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">path</span> p <span class="sy1">=</span> <span class="st0">"foo.bar.baz.tar"</span><span class="sy4">;</span> <span class="sy3">!</span>p.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> p <span class="sy1">=</span> p.<span class="me1">stem</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> p.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <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>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">"bar"
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".bar"
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".tar"
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".baz"
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".bar"</pre></div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-filesystem-path-filename.html"><span class="t-lines"><span>filename</span></span></a></div>
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</div>
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</td>
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<td>返回文件名路径组分<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-filesystem-path-extension.html"><span class="t-lines"><span>extension</span></span></a></div>
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</td>
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<td>返回文件扩展名路径组分<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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