klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
73049b71b6a595dc58fb9501b87d566cfb769e61
hustoj/web/cppreference-zh/chmhelp/cpp-filesystem-path-lexically_normal.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

155 lines
17 KiB
HTML
Raw Blame History

<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>std::filesystem::path::lexically_normal, std::filesystem::path::lexically_relative, std::filesystem::path::lexically_proximate</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_filesystem_path_lexically_normal skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>lexically_normal, <span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>lexically_relative, <span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>lexically_proximate</h1>
<div id="bodyContent">
<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>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">path lexically_normal<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
</td>
<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">path lexically_relative<span class="br0">(</span><span class="kw4">const</span> path<span class="sy3">&amp;</span> base<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
</td>
<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">path lexically_proximate<span class="br0">(</span><span class="kw4">const</span> path<span class="sy3">&amp;</span> base<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
</td>
<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238;&#20197;&#20854;&#36890;&#29992;&#26684;&#24335;&#36716;&#25442;&#25104;<a href="cpp-filesystem-path.html">&#27491;&#35268;&#24418;&#24335;</a>&#30340; <code>*this</code></div>
<div class="t-li1"><span class="t-li">2)</span> &#36820;&#22238;&#35774;&#20026;&#30456;&#23545; <code>base</code> &#30340; <code>*this</code> &#12290;
<dl>
<dd>
<ul>
<li>&#39318;&#20808;&#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">root_name<span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> base.<span class="me1">root_name</span><span class="br0">(</span><span class="br0">)</span></span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">is_absolute<span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> base.<span class="me1">is_absolute</span><span class="br0">(</span><span class="br0">)</span></span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="sy3">!</span>has_root_directory<span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;&amp;</span> base.<span class="me1">has_root_directory</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">relative_path<span class="br0">(</span><span class="br0">)</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">base.<span class="me1">relative_path</span><span class="br0">(</span><span class="br0">)</span></span></span> &#20013;&#30340;&#20219;&#20309;&#25991;&#20214;&#21517;&#33021;&#36716;&#35793;&#20026; <span class="t-spar">&#26681;&#21517;</span>, &#65292;&#21017;&#36820;&#22238;&#40664;&#35748;&#26500;&#36896;&#30340; <code>path</code> &#12290;</li>
<li>&#21542;&#21017;&#65292;&#39318;&#20808;&#30830;&#23450; <code>*this</code> &#21644; <code>base</code> &#30340;&#39318;&#20010;&#19981;&#21305;&#37197;&#20803;&#32032;&#65292;&#22914;&#21516;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">auto</span> <span class="br0">[</span>a, b<span class="br0">]</span> <span class="sy1">=</span> mismatch<span class="br0">(</span>begin<span class="br0">(</span><span class="br0">)</span>, end<span class="br0">(</span><span class="br0">)</span>, base.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, base.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#28982;&#21518;</li>
</ul>
<dl>
<dd>
<ul>
<li>&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">a <span class="sy1">==</span> end<span class="br0">(</span><span class="br0">)</span></span></span> &#19988; <span class="t-c"><span class="mw-geshi cpp source-cpp">b <span class="sy1">==</span> base.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span></span></span> &#65292;&#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp">path<span class="br0">(</span><span class="st0">&quot;.&quot;</span><span class="br0">)</span></span></span> &#65307;</li>
<li>&#21542;&#21017;&#65292;&#23450;&#20041; <span class="texhtml" style="white-space: nowrap;">N</span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">[</span>b, base.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> &#20013;&#26082;&#38750; <span class="t-spar">dot</span> &#20134;&#38750; <span class="t-spar">dot-dot</span> &#30340;&#38750;&#31354;&#25991;&#20214;&#21517;&#20803;&#32032;&#25968;&#20943;&#21435; <span class="t-spar">dot-dot</span> &#25991;&#20214;&#21517;&#20803;&#32032;&#25968;&#12290;&#33509; <span class="texhtml" style="white-space: nowrap;">N &lt; 0</span> &#21017;&#36820;&#22238;&#40664;&#35748;&#26500;&#36896;&#30340; <code>path</code> &#12290;</li>
<li>&#21542;&#21017;&#65292;&#33509; <span class="texhtml" style="white-space: nowrap;">N = 0</span> &#19988; <span class="t-c"><span class="mw-geshi cpp source-cpp">a <span class="sy1">==</span> end<span class="br0">(</span><span class="br0">)</span> <span class="sy3">||</span> a<span class="sy2">-</span><span class="sy1">&gt;</span>empty<span class="br0">(</span><span class="br0">)</span></span></span> &#65292;&#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp">path<span class="br0">(</span><span class="st0">&quot;.&quot;</span><span class="br0">)</span></span></span> &#12290;</li>
<li>&#21542;&#21017;&#36820;&#22238;&#30001;&#20197;&#19979;&#26041;&#24335;&#21512;&#25104;&#30340;&#23545;&#35937;</li>
</ul>
<dl>
<dd>
<ul>
<li>&#40664;&#35748;&#26500;&#36896; <span class="t-c"><span class="mw-geshi cpp source-cpp">path<span class="br0">(</span><span class="br0">)</span></span></span> &#21518;</li>
<li>&#24212;&#29992; <span class="texhtml" style="white-space: nowrap;">N</span> &#27425; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span>path<span class="br0">(</span><span class="st0">&quot;..&quot;</span><span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#20043;&#21518;</li>
<li>&#23545;&#21322;&#24320;&#33539;&#22260; <code>[a, end())</code> &#20013;&#30340;&#27599;&#20010;&#20803;&#32032;&#24212;&#29992;&#19968;&#27425; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy2">/</span><span class="sy1">=</span></span></span></li>
</ul>
</dd>
</dl>
</dd>
</dl>
</dd>
</dl>
</div>
<div class="t-li1"><span class="t-li">3)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">lexically_relative<span class="br0">(</span>base<span class="br0">)</span></span></span> &#30340;&#20540;&#19981;&#26159;&#31354;&#36335;&#24452;&#65292;&#21017;&#36820;&#22238;&#23427;&#12290;&#21542;&#21017;&#36820;&#22238; <code>*this</code> &#12290;</div>
<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>
<div class="t-li1"><span class="t-li">1)</span> &#36335;&#24452;&#30340;&#27491;&#35268;&#24418;&#24335;</div>
<div class="t-li1"><span class="t-li">2)</span> &#36335;&#24452;&#30340;&#30456;&#23545;&#24418;&#24335;</div>
<div class="t-li1"><span class="t-li">3)</span> &#36335;&#24452;&#30340;&#36817;&#20284;&#24418;&#24335;</div>
<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>&#36825;&#20123;&#36716;&#25442;&#26159;&#32431;&#25991;&#23383;&#30340;&#12290;&#23427;&#20204;&#19981;&#26816;&#26597;&#36335;&#24452;&#26159;&#21542;&#23384;&#22312;&#65292;&#19981;&#36319;&#38543;&#31526;&#21495;&#38142;&#25509;&#65292;&#19988;&#23436;&#20840;&#19981;&#35775;&#38382;&#25991;&#20214;&#31995;&#32479;&#12290;&#20851;&#20110; <code>lexically_relative</code> &#19982; <code>lexically_proximate</code> &#36319;&#38543;&#31526;&#21495;&#38142;&#25509;&#30340;&#23545;&#24212;&#29256;&#26412;&#65292;&#35265; <a href="cpp-filesystem-relative.html"><tt>relative</tt></a> &#19982; <a href="cpp-filesystem-relative.html"><tt>proximate</tt></a> &#12290;</p>
<p>Windows &#19978;&#36820;&#22238;&#36335;&#24452;&#25317;&#26377;&#21453;&#26012;&#26464;&#65288;&#20559;&#22909;&#20998;&#38548;&#31526;&#65289;&#12290;</p>
<p>POSIX &#19978;&#30456;&#23545;&#36335;&#24452;&#20013;&#30340;&#25991;&#20214;&#21517;&#22343;&#19981;&#21487;&#25509;&#21463;&#20026; <span class="t-spar">&#26681;&#21517;</span> &#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="co2">#include &lt;cassert&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-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</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">lexically_normal</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;foo/&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</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">lexically_normal</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;foo/&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/a/d&quot;</span><span class="br0">)</span>.<span class="me1">lexically_relative</span><span class="br0">(</span><span class="st0">&quot;/a/b/c&quot;</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;../../d&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;/a/b/c&quot;</span><span class="br0">)</span>.<span class="me1">lexically_relative</span><span class="br0">(</span><span class="st0">&quot;/a/d&quot;</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;../b/c&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;a/b/c&quot;</span><span class="br0">)</span>.<span class="me1">lexically_relative</span><span class="br0">(</span><span class="st0">&quot;a&quot;</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;b/c&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;a/b/c&quot;</span><span class="br0">)</span>.<span class="me1">lexically_relative</span><span class="br0">(</span><span class="st0">&quot;a/b/c/x/y&quot;</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;../..&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;a/b/c&quot;</span><span class="br0">)</span>.<span class="me1">lexically_relative</span><span class="br0">(</span><span class="st0">&quot;a/b/c&quot;</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;.&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">path</span><span class="br0">(</span><span class="st0">&quot;a/b&quot;</span><span class="br0">)</span>.<span class="me1">lexically_relative</span><span class="br0">(</span><span class="st0">&quot;c/d&quot;</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;../../a/b&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3070">LWG 3070</a></td>
<td>C++17</td>
<td>&#20134;&#33021;&#20026;&#26681;&#21517;&#30340;&#25991;&#20214;&#21517;&#21487;&#33021;&#23548;&#33268;&#35815;&#24322;&#30340;&#32467;&#26524;</td>
<td>&#24403;&#20316;&#38169;&#35823;&#24773;&#20917;</td>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3096">LWG 3096</a></td>
<td>C++17</td>
<td>&#38169;&#35823;&#22320;&#22788;&#29702;&#20102;&#23614;&#38543; &quot;/&quot; &#21644; &quot;/.&quot;</td>
<td>&#24050;&#26356;&#27491;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-filesystem-relative.html"><span class="t-lines"><span>relative</span><span>proximate</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
</div>
</td>
<td>&#32452;&#25104;&#19968;&#20010;&#30456;&#23545;&#36335;&#24452;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink