klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
196e706fe41f737f31d8617ead8fe566aa616329
hustoj/web/cppreference-zh/chmhelp/cpp-container-multiset-erase.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

218 lines
16 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::multiset&lt;Key,Compare,Allocator&gt;::erase</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_container_multiset_erase skin-cppreference2 action-view cpp-page-template 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::multiset&lt;Key,Compare,Allocator&gt;::</span>erase</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-container.html">container</a>&lrm; | <a href="cpp-container-multiset.html">multiset</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<div class="t-page-template" style="">
<p></p>
</div>
<table class="t-dcl-begin">
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> erase<span class="br0">(</span> iterator pos <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp">iterator erase<span class="br0">(</span> iterator pos <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp">iterator erase<span class="br0">(</span> const_iterator pos <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
</tbody>
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(2)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> erase<span class="br0">(</span> iterator first, iterator last <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td>
<div><span class="mw-geshi cpp source-cpp">iterator erase<span class="br0">(</span> const_iterator first, const_iterator last <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
</tr>
</tbody>
<tbody>
<tr class="t-dcl t-since-cxx98">
<td>
<div><span class="mw-geshi cpp source-cpp">size_type erase<span class="br0">(</span> <span class="kw4">const</span> key_type<span class="sy3">&amp;</span> key <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(3)</td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl t-since-cxx23">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> K <span class="sy1">&gt;</span><br />
size_type erase<span class="br0">(</span> K<span class="sy3">&amp;&amp;</span> x <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx23">(C++23 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#20174;&#23481;&#22120;&#31227;&#38500;&#25351;&#23450;&#30340;&#20803;&#32032;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#31227;&#38500;&#20301;&#20110; <code>pos</code> &#30340;&#20803;&#32032;&#12290;<span class="t-rev-inl t-since-cxx11"><span>&#33509; <code>iterator</code> &#19982; <code>const_iterator</code> &#20026;&#21516;&#19968;&#31867;&#22411;&#21017;&#20165;&#25552;&#20379;&#19968;&#20010;&#37325;&#36733;&#12290;</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span></div>
<div class="t-li1"><span class="t-li">2)</span> &#31227;&#38500;&#33539;&#22260; <code>[first; last)</code> &#20013;&#30340;&#20803;&#32032;&#65292;&#23427;&#24517;&#39035;&#26159; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> &#20013;&#30340;&#21512;&#27861;&#33539;&#22260;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#31227;&#38500;&#38190;&#31561;&#20215;&#20110; <code>key</code> &#30340;&#25152;&#26377;&#20803;&#32032;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#31227;&#38500;&#38190;&#27604;&#36739;<i>&#31561;&#20215;</i>&#20110;&#20540; x &#30340;&#25152;&#26377;&#20803;&#32032;&#12290;&#27492;&#37325;&#36733;&#20165;&#33509;&#26377;&#38480;&#23450;&#26631;&#35782; <span class="t-c"><span class="mw-geshi cpp source-cpp">Compare<span class="sy4">::</span><span class="me2">is_transparent</span></span></span> &#21512;&#27861;&#24182;&#25351;&#20195;&#31867;&#22411;&#65292;&#19988; <code>iterator</code> &#19982; <code>const_iterator</code> &#22343;&#19981;&#21487;&#20174; <code>K</code> &#38544;&#24335;&#36716;&#25442;&#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;&#23427;&#20801;&#35768;&#26080;&#38656;&#26500;&#36896; <code>Key</code> &#30340;&#23454;&#20363;&#23601;&#35843;&#29992;&#27492;&#20989;&#25968;&#12290;</div>
<p>&#25351;&#21521;&#34987;&#25830;&#38500;&#20803;&#32032;&#30340;&#24341;&#29992;&#21644;&#36845;&#20195;&#22120;&#34987;&#38750;&#27861;&#21270;&#12290;&#20854;&#20182;&#24341;&#29992;&#21644;&#36845;&#20195;&#22120;&#19981;&#21463;&#24433;&#21709;&#12290;</p>
<p>&#36845;&#20195;&#22120; <code>pos</code> &#24517;&#39035;&#21512;&#27861;&#19988;&#21487;&#35299;&#24341;&#29992;&#12290;&#20174;&#32780; <span class="t-lc"><a href="cpp-container-multiset-end.html">end()</a></span> &#36845;&#20195;&#22120;&#65288;&#21512;&#27861;&#65292;&#20294;&#19981;&#21487;&#35299;&#24341;&#29992;&#65289;&#19981;&#33021;&#29992;&#20316; <code>pos</code> &#25152;&#29992;&#30340;&#20540;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>pos</td>
<td>-</td>
<td>&#25351;&#21521;&#35201;&#31227;&#38500;&#30340;&#20803;&#32032;&#30340;&#36845;&#20195;&#22120;</td>
</tr>
<tr class="t-par">
<td>first, last</td>
<td>-</td>
<td>&#35201;&#31227;&#38500;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>key</td>
<td>-</td>
<td>&#35201;&#31227;&#38500;&#30340;&#20803;&#32032;&#38190;&#20540;</td>
</tr>
<tr class="t-par">
<td>x</td>
<td>-</td>
<td>&#20219;&#20309;&#33021;&#19982;&#38190;&#36890;&#36879;&#27604;&#36739;&#30340;&#31867;&#22411;&#30340;&#20540;&#65292;&#25351;&#20195;&#35201;&#31227;&#38500;&#30340;&#20803;&#32032;</td>
</tr>
</table>
<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">1-2)</span> <span class="t-rev-inl t-until-cxx11"><span>&#65288;&#26080;&#65289;</span> <span><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></span></span><span class="t-rev-inl t-since-cxx11"><span>&#21518;&#38543;&#26368;&#21518;&#34987;&#31227;&#38500;&#30340;&#20803;&#32032;&#30340;&#36845;&#20195;&#22120;&#12290;</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span></div>
<div class="t-li1"><span class="t-li">3,4)</span> &#34987;&#31227;&#38500;&#30340;&#20803;&#32032;&#25968;&#12290;</div>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<div class="t-li1"><span class="t-li">1,2)</span> &#19981;&#25243;&#20986;</div>
<div class="t-li1"><span class="t-li">3,4)</span> &#20219;&#20309; <code>Compare</code> &#23545;&#35937;&#25152;&#25243;&#30340;&#24322;&#24120;</div>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#32473;&#23450; <code>multiset</code> &#30340;&#23454;&#20363; <code>c</code> &#65306;</p>
<div class="t-li1"><span class="t-li">1)</span> &#22343;&#25674;&#24120;&#25968;</div>
<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">log<span class="br0">(</span>c.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">+</span> <a href="cpp-iterator-distance.html"><span class="kw673">std::<span class="me2">distance</span></span></a><span class="br0">(</span>first, last<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">log<span class="br0">(</span>c.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">+</span> c.<span class="me1">count</span><span class="br0">(</span>key<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">4)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">log<span class="br0">(</span>c.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">+</span> c.<span class="me1">count</span><span class="br0">(</span>x<span class="br0">)</span></span></span></div>
<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;set&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-container-multiset.html"><span class="kw1279">std::<span class="me2">multiset</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> c <span class="sy1">=</span> <span class="br0">{</span> <span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">auto</span> print <span class="sy1">=</span> <span class="br0">[</span><span class="sy3">&amp;</span>c<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> <span class="st0">&quot;c = { &quot;</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy4">:</span> c<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> n <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;}<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
print<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Erase all odd numbers:<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">auto</span> it <span class="sy1">=</span> c.<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> c.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">if</span><span class="br0">(</span><span class="sy2">*</span>it <span class="sy2">%</span> <span class="nu0">2</span> <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span><span class="br0">)</span>
it <span class="sy1">=</span> c.<span class="me1">erase</span><span class="br0">(</span>it<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span>
<span class="sy2">++</span>it<span class="sy4">;</span>
<span class="br0">}</span>
print<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Erase 1, erased count: &quot;</span> <span class="sy1">&lt;&lt;</span> c.<span class="me1">erase</span><span class="br0">(</span><span class="nu0">1</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>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Erase 2, erased count: &quot;</span> <span class="sy1">&lt;&lt;</span> c.<span class="me1">erase</span><span class="br0">(</span><span class="nu0">2</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>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Erase 2, erased count: &quot;</span> <span class="sy1">&lt;&lt;</span> c.<span class="me1">erase</span><span class="br0">(</span><span class="nu0">2</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>
print<span class="br0">(</span><span class="br0">)</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">c = { 1 1 2 2 3 3 4 4 }
Erase all odd numbers:
c = { 2 2 4 4 }
Erase 1, erased count: 0
Erase 2, erased count: 2
Erase 2, erased count: 0
c = { 4 4 }</pre></div>
</div>
</div>
<p><br /></p>
<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/issue2059">LWG 2059</a></td>
<td>C++11</td>
<td>&#23545;&#19968;&#20010; <code>const_iterator</code> &#30340;&#37325;&#36733;&#24341;&#20837;&#20102;&#26032;&#30340;&#27495;&#20041;</td>
<td>&#28155;&#21152;&#20102;&#23545; <code>iterator</code> &#30340;&#37325;&#36733;</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-container-multiset-clear.html"><span class="t-lines"><span>clear</span></span></a></div>
</div>
</td>
<td>&#28165;&#38500;&#20869;&#23481;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#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