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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::filesystem::</span>equivalent</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></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-filesystem.html">&lt;filesystem&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> equivalent<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-filesystem-path.html"><span class="kw2199">std::<span class="me2">filesystem</span><span class="sy4">::</span><span class="me2">path</span></span></a><span class="sy3">&amp;</span> p1,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-filesystem-path.html"><span class="kw2199">std::<span class="me2">filesystem</span><span class="sy4">::</span><span class="me2">path</span></span></a><span class="sy3">&amp;</span> p2 <span class="br0">)</span><span class="sy4">;</span><br />
<span class="kw4">bool</span> equivalent<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-filesystem-path.html"><span class="kw2199">std::<span class="me2">filesystem</span><span class="sy4">::</span><span class="me2">path</span></span></a><span class="sy3">&amp;</span> p1,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-filesystem-path.html"><span class="kw2199">std::<span class="me2">filesystem</span><span class="sy4">::</span><span class="me2">path</span></span></a><span class="sy3">&amp;</span> p2,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> ec <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</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>&#26816;&#26597;&#36335;&#24452; <code>p1</code> &#19982; <code>p2</code> &#26159;&#21542;&#35299;&#26512;&#21040;&#21516;&#19968;&#25991;&#20214;&#31995;&#32479;&#23454;&#20307;&#12290;</p>
<p>&#33509; <code>p1</code> &#25110; <code>p2</code> &#19981;&#23384;&#22312;&#21017;&#25253;&#21578;&#38169;&#35823;&#12290;</p>
<p>&#19981;&#25243;&#20986;&#37325;&#36733;&#22312;&#38169;&#35823;&#26102;&#36820;&#22238; <code>false</code> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>p1, p2</td>
<td>-</td>
<td>&#35201;&#26816;&#27979;&#31561;&#20215;&#24615;&#30340;&#36335;&#24452;</td>
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<td>ec</td>
<td>-</td>
<td>&#19981;&#25243;&#20986;&#37325;&#36733;&#20013;&#25253;&#21578;&#38169;&#35823;&#30340;&#36755;&#20986;&#21442;&#25968;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509; <code>p1</code> &#19982; <code>p2</code> &#25351;&#20195;&#21516;&#19968;&#25991;&#20214;&#25110;&#30446;&#24405;&#19988;&#20854;&#25991;&#20214;&#29366;&#24577;&#30456;&#21516;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#19981;&#25509;&#21463; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span></span></span> &#21442;&#25968;&#30340;&#37325;&#36733;&#22312;&#24213;&#23618; OS API &#38169;&#35823;&#26102;&#25243;&#20986; <a href="cpp-filesystem-filesystem_error.html"><tt>filesystem_error</tt></a> &#65292;&#20197;&#31532;&#19968; path &#21442;&#25968; <code>p1</code>&#65292;&#31532;&#20108; path &#21442;&#25968; <code>p2</code> &#21644;&#20316;&#20026;&#38169;&#35823;&#30721;&#21442;&#25968;&#30340; OS &#38169;&#35823;&#30721;&#26500;&#36896;&#12290;&#33509; OS API &#35843;&#29992;&#22833;&#36133;&#65292;&#21017;&#25509;&#21463; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span></span></span> &#21442;&#25968;&#30340;&#37325;&#36733;&#35774;&#32622;&#35813;&#21442;&#25968;&#20026; OS API &#38169;&#35823;&#30721;&#65292;&#32780;&#33509;&#19981;&#20986;&#29616;&#38169;&#35823;&#21017;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp">ec.<span class="me1">clear</span><span class="br0">(</span><span class="br0">)</span></span></span> &#12290;&#33509;&#20869;&#23384;&#20998;&#37197;&#22833;&#36133;&#65292;&#21017;&#20219;&#20309;&#19981;&#26631;&#35760;&#20026; <code>noexcept</code> &#30340;&#37325;&#36733;&#21487;&#33021;&#25243;&#20986; <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> &#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#33509;&#20108;&#20010;&#36335;&#24452;&#35299;&#26512;&#21040;&#30340;&#20505;&#36873;&#23454;&#20307;&#20301;&#20110;&#21516;&#35774;&#22791;&#30340;&#21516;&#19968;&#20301;&#32622;&#65292;&#21017;&#35748;&#20026;&#23427;&#20204;&#35299;&#26512;&#21040;&#21516;&#19968;&#25991;&#20214;&#31995;&#32479;&#23454;&#20307;&#12290;&#23545;&#20110; POSIX &#65292;&#36825;&#34920;&#26126;&#20854;&#22914;&#21516;&#20197; POSIX <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html"><code>stat()</code></a> &#33719;&#24471;&#30340; POSIX <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_stat.h.html"><code>stat</code> &#32467;&#26500;</a>&#30340; <code>st_dev</code> &#19982; <code>st_ino</code> &#25104;&#21592;&#30456;&#31561;&#12290;</p>
<p>&#36890;&#24120;&#65292;&#25152;&#26377;&#21516;&#19968;&#25991;&#20214;&#30340;&#30446;&#24405;&#25110;&#30828;&#38142;&#25509;&#31561;&#20215;&#65292;&#32780;&#21516;&#19968;&#25991;&#20214;&#31995;&#32479;&#19978;&#30340;&#31526;&#21495;&#38142;&#25509;&#19982;&#20854;&#30446;&#26631;&#31561;&#20215;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cstdint&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>
<span class="co1">// &#30828;&#38142;&#25509;&#31561;&#20215;</span>
fs<span class="sy4">::</span><span class="me2">path</span> p1 <span class="sy1">=</span> <span class="st0">&quot;.&quot;</span><span class="sy4">;</span>
fs<span class="sy4">::</span><span class="me2">path</span> p2 <span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">current_path</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">(</span>p1, p2<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> p1 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; is equivalent to &quot;</span> <span class="sy1">&lt;&lt;</span> p2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="co1">// &#31526;&#21495;&#38142;&#25509;&#31561;&#20215;</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">const</span> fs<span class="sy4">::</span><span class="me2">path</span> lib <span class="sy4">:</span> <span class="br0">{</span><span class="st0">&quot;/lib/libc.so.6&quot;</span>, <span class="st0">&quot;/lib/x86_64-linux-gnu/libc.so.6&quot;</span><span class="br0">}</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">try</span> <span class="br0">{</span>
p2 <span class="sy1">=</span> lib.<span class="me1">parent_path</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">/</span> fs<span class="sy4">::</span><span class="me2">read_symlink</span><span class="br0">(</span>lib<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span> <span class="kw1">catch</span><span class="br0">(</span><a href="cpp-filesystem-filesystem_error.html"><span class="kw2202">std::<span class="me2">filesystem</span><span class="sy4">::</span><span class="me2">filesystem_error</span></span></a> <span class="kw4">const</span><span class="sy3">&amp;</span> ex<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> ex.<span class="me1">what</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="kw1">continue</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">if</span><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">(</span>lib, p2<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> lib <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; is equivalent to &quot;</span> <span class="sy1">&lt;&lt;</span> p2 <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>
<span class="br0">}</span></pre></div>
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<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
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<pre class="de1">&quot;.&quot; is equivalent to &quot;/var/tmp/test&quot;
filesystem error: read_symlink: No such file or directory [/lib/libc.so.6]
&quot;/lib/x86_64-linux-gnu/libc.so.6&quot; is equivalent to &quot;/lib/x86_64-linux-gnu/libc-2.23.so&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><a href="cpp-filesystem-status.html"><span class="t-lines"><span>status</span><span>symlink_status</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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<td>&#30830;&#23450;&#25991;&#20214;&#23646;&#24615;<br />
&#30830;&#23450;&#25991;&#20214;&#23646;&#24615;&#65292;&#26816;&#26597;&#31526;&#21495;&#38142;&#25509;&#30446;&#26631;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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