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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>extension</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-filesystem.html">filesystem</a>&lrm; | <a href="cpp-filesystem-path.html">path</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">path extension<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 &#36215;)</span></td>
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<p>&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> &#30340;&#36890;&#29992;&#26684;&#24335;&#35270;&#22270;&#30340;&#25991;&#20214;&#21517;&#30340;&#25193;&#23637;&#21517;&#12290;</p>
<p>&#33509;&#36890;&#29992;&#26684;&#24335;&#36335;&#24452;&#30340; <a href="cpp-filesystem-path-filename.html"><tt>filename()</tt></a> &#32452;&#20998;&#21547;&#26377;&#21477;&#21495;&#65288; <code><b>.</b></code> &#65289;&#65292;&#19988;&#19981;&#26159;&#29305;&#27530;&#25991;&#20214;&#31995;&#32479;&#20803;&#32032; <span class="t-spar">dot</span> &#25110; <span class="t-spar">dot-dot</span> &#20043;&#19968;&#65292;&#21017;<i>&#25193;&#23637;&#21517;</i>&#26159;&#20174;&#26368;&#21491;&#30340;&#21477;&#21495;&#24320;&#22987;&#65288;&#21547;&#21477;&#21495;&#65289;&#21040;&#36335;&#24452;&#21517;&#23614;&#30340;&#23376;&#20018;&#12290;</p>
<p>&#33509;&#25991;&#20214;&#21517;&#30340;&#39318;&#20010;&#23383;&#31526;&#26159;&#21477;&#21495;&#65292;&#21017;&#24573;&#30053;&#35813;&#21477;&#21495;&#65288;&#31867;&#20284; &quot;.profile&quot; &#30340;&#25991;&#20214;&#21517;&#19981;&#34987;&#24403;&#20570;&#25193;&#23637;&#21517;&#65289;</p>
<p>&#33509;&#36335;&#24452;&#21517;&#26159; <code>.</code> &#25110; <code>..</code> &#65292;&#25110;&#33509; <a href="cpp-filesystem-path-filename.html"><tt>filename()</tt></a> &#19981;&#21547;&#26377; <code>.</code> &#23383;&#31526;&#65292;&#21017;&#36820;&#22238;&#31354;&#36335;&#24452;&#12290;</p>
<p>&#23454;&#29616;&#21487;&#20197;&#20026;&#28155;&#21152;&#20102;&#38468;&#21152;&#20803;&#32032;&#21040;&#25193;&#23637;&#21517;&#30340;&#25991;&#20214;&#31995;&#32479;&#23450;&#20041;&#38468;&#21152;&#34892;&#20026;&#65288;&#20363;&#22914;&#20316;&#20026;&#21478;&#19968;&#31181;&#25968;&#25454;&#27969;&#25110;&#24102;&#20998;&#21306;&#25968;&#25454;&#38598;&#30340;&#21517;&#31216;&#65289;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#24403;&#21069;&#36335;&#24452;&#21517;&#30340;&#25193;&#23637;&#21517;&#65292;&#25110;&#33509;&#26080;&#25193;&#23637;&#21517;&#21017;&#20026;&#31354;&#36335;&#24452;&#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986;&#23454;&#29616;&#23450;&#20041;&#30340;&#24322;&#24120;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#27492;&#20989;&#25968;&#36820;&#22238;&#30340;&#25193;&#23637;&#21517;&#21253;&#21547;&#28857;&#65292;&#20196;&#31243;&#24207;&#21487;&#20197;&#20998;&#36776;&#20197;&#28857;&#32467;&#26463;&#30340;&#25991;&#20214;&#65288;&#20989;&#25968;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&quot;.&quot;</span></span></span> &#65289;&#21644;&#26080;&#25193;&#23637;&#21517;&#30340;&#25991;&#20214;&#65288;&#20989;&#25968;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&quot;&quot;</span></span></span> &#65289;</p>
<p>&#22312;&#38750; POSIX &#31995;&#32479;&#19978;&#65292;&#21487;&#33021;&#26377; <span class="t-c"><span class="mw-geshi cpp source-cpp">p.<span class="me1">stem</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">+</span>p.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> p.<span class="me1">filename</span><span class="br0">(</span><span class="br0">)</span></span></span> &#65292;&#21363;&#20351;&#36890;&#29992;&#26684;&#24335;&#29256;&#26412;&#26159;&#30456;&#21516;&#30340;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;filesystem&gt;</span>
<span class="kw1">namespace</span> fs <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">filesystem</span><span class="sy4">;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/bar.txt&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/bar.&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/bar&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/bar.txt/bar.cc&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/bar.txt/bar.&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/bar.txt/bar&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/.&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/..&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/.hidden&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/..bar&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/foo/bar.txt.bak&quot;</span><span class="br0">)</span>.<span class="me1">extension</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">&quot;.txt&quot;
&quot;.&quot;
&quot;&quot;
&quot;.cc&quot;
&quot;.&quot;
&quot;&quot;
&quot;&quot;
&quot;&quot;
&quot;&quot;
&quot;.bar&quot;
&quot;.bak&quot;</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-filesystem-path-filename.html"><span class="t-lines"><span>filename</span></span></a></div>
</div>
</td>
<td>&#36820;&#22238;&#25991;&#20214;&#21517;&#36335;&#24452;&#32452;&#20998;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-filesystem-path-stem.html"><span class="t-lines"><span>stem</span></span></a></div>
</div>
</td>
<td>&#36820;&#22238;&#20027;&#24178;&#36335;&#24452;&#32452;&#20998;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-filesystem-path-replace_extension.html"><span class="t-lines"><span>replace_extension</span></span></a></div>
</div>
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<td>&#26367;&#25442;&#25193;&#23637;&#21517;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-filesystem-path-has_path.html"><span class="t-lines"><span>has_extension</span></span></a></div>
</div>
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<td>&#26816;&#26597;&#23545;&#24212;&#36335;&#24452;&#20803;&#32032;&#26159;&#21542;&#38750;&#31354;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="visualClear"></div>
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