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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>remove, <span style="font-size:0.7em; line-height:130%">std::</span>remove_if</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-algorithm.html">algorithm</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-algorithm.html">&lt;algorithm&gt;</a></code></div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
ForwardIt remove<span class="br0">(</span> ForwardIt first, ForwardIt last, <span class="kw4">const</span> T<span class="sy3">&amp;</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> ForwardIt remove<span class="br0">(</span> ForwardIt first, ForwardIt last, <span class="kw4">const</span> T<span class="sy3">&amp;</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> ExecutionPolicy, <span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> T <span class="sy1">&gt;</span><br /></span>
<p>ForwardIt remove<span class="br0">(</span> ExecutionPolicy<span class="sy3">&amp;&amp;</span> policy, ForwardIt first, ForwardIt last,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> T<span class="sy3">&amp;</span> value <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<td rowspan="142">(3)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> UnaryPredicate <span class="sy1">&gt;</span><br />
ForwardIt remove_if<span class="br0">(</span> ForwardIt first, ForwardIt last, UnaryPredicate p <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> UnaryPredicate <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> ForwardIt remove_if<span class="br0">(</span> ForwardIt first, ForwardIt last, UnaryPredicate p <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> ExecutionPolicy, <span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> UnaryPredicate <span class="sy1">&gt;</span><br /></span>
<p>ForwardIt remove_if<span class="br0">(</span> ExecutionPolicy<span class="sy3">&amp;&amp;</span> policy, ForwardIt first, ForwardIt last,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;UnaryPredicate p <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<p>&#20174;&#33539;&#22260; <code>[first, last)</code> &#31227;&#38500;&#25152;&#26377;&#28385;&#36275;&#29305;&#23450;&#21028;&#21035;&#26631;&#20934;&#30340;&#20803;&#32032;&#65292;&#24182;&#36820;&#22238;&#33539;&#22260;&#26032;&#32467;&#23614;&#30340;&#23614;&#21518;&#36845;&#20195;&#22120;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#31227;&#38500;&#25152;&#26377;&#31561;&#20110; <code>value</code> &#30340;&#20803;&#32032;&#65292;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1">==</span></span></span> &#27604;&#36739;&#23427;&#20204;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#31227;&#38500;&#25152;&#26377; <code>p</code> &#23545;&#20110;&#23427;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#30340;&#20803;&#32032;&#12290;</div>
<div class="t-li1"><span class="t-li">2,4)</span> &#21516; <span class="t-v">(1,3)</span> &#65292;&#20294;&#25353;&#29031; <code>policy</code> &#25191;&#34892;&#12290;&#36825;&#20123;&#37325;&#36733;&#20165;&#33509; <span class="t-rev-inl t-until-cxx20"><span><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-algorithm-is_execution_policy.html"><span class="kw1564">std::<span class="me2">is_execution_policy_v</span></span></a><span class="sy1">&lt;</span><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>ExecutionPolicy<span class="sy1">&gt;&gt;</span></span></span></span> <span><span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></span></span><span class="t-rev-inl t-since-cxx20"><span><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-algorithm-is_execution_policy.html"><span class="kw1564">std::<span class="me2">is_execution_policy_v</span></span></a><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">remove_cvref_t</span><span class="sy1">&lt;</span>ExecutionPolicy<span class="sy1">&gt;&gt;</span></span></span></span> <span><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></span></span> &#20026; true &#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;</div>
<p>&#36890;&#36807;&#20351;&#26410;&#34987;&#31227;&#38500;&#30340;&#20803;&#32032;&#20986;&#29616;&#22312;&#33539;&#22260;&#36215;&#22987;&#36825;&#31181;&#26041;&#24335;&#65292;&#36801;&#31227;&#65288;&#26041;&#24335;&#20026;<span class="t-rev-inl t-until-cxx11"><span>&#22797;&#21046;&#36171;&#20540;</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>&#31227;&#21160;&#36171;&#20540;</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span>&#65289;&#33539;&#22260;&#20013;&#20803;&#32032;&#65292;&#26469;&#36827;&#34892;&#31227;&#38500;&#12290;&#20445;&#25345;&#21097;&#20313;&#20803;&#32032;&#30340;&#30456;&#23545;&#39034;&#24207;&#32780;&#23481;&#22120;&#30340;<i>&#29289;&#29702;</i>&#22823;&#23567;&#20445;&#25345;&#19981;&#21464;&#12290;&#25351;&#21521;&#26032;&#30340;<i>&#36923;&#36753;</i>&#32467;&#23614;&#19982;<i>&#29289;&#29702;</i>&#32467;&#23614;&#20043;&#38388;&#30340;&#36845;&#20195;&#22120;&#20173;&#28982;&#21487;&#35299;&#24341;&#29992;&#65292;&#20294;&#20803;&#32032;&#33258;&#36523;&#25317;&#26377;&#26410;&#25351;&#23450;&#30340;&#20540;&#65288;&#32463;&#30001;<a href="cpp-named_req-MoveAssignable.html"><span style="font-style:italic">&#21487;&#31227;&#21160;&#36171;&#20540;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(MoveAssignable)</span></a> &#30340;&#21518;&#26465;&#20214;&#65289;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
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<td>first, last</td>
<td>-</td>
<td>&#35201;&#22788;&#29702;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
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<tr class="t-par">
<td>value</td>
<td>-</td>
<td>&#35201;&#31227;&#38500;&#30340;&#20803;&#32032;&#20540;</td>
</tr>
<tr class="t-par">
<td>policy</td>
<td>-</td>
<td>&#25152;&#29992;&#30340;&#25191;&#34892;&#31574;&#30053;&#12290;&#32454;&#33410;&#35265;<a href="cpp-algorithm-execution_policy_tag_t.html">&#25191;&#34892;&#31574;&#30053;</a>&#12290;</td>
</tr>
<tr class="t-par">
<td>p</td>
<td>-</td>
<td>&#33509;&#24212;&#35813;&#31227;&#38500;&#20803;&#32032;&#21017;&#36820;&#22238; &#8203;<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#30340;&#19968;&#20803;&#35859;&#35789;&#12290;<br />
<p>&#23545;&#27599;&#20010;&#65288;&#21487;&#20026; const &#30340;&#65289; <code>VT</code> &#31867;&#22411;&#21442;&#25968; <code>v</code> &#65292;&#20854;&#20013; <code>VT</code> &#26159; <code>ForwardIt</code> &#30340;&#20540;&#31867;&#22411;&#65292;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">p<span class="br0">(</span>v<span class="br0">)</span></span></span> &#24517;&#39035;&#21487;&#36716;&#25442;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> &#65292;&#26080;&#20851;&#20046;<a href="cpp-language-value_category.html">&#20540;&#31867;&#21035;</a>&#65292;&#32780;&#19988;&#24517;&#39035;&#19981;&#20462;&#25913; <code>v</code> &#12290;&#20174;&#32780;&#19981;&#20801;&#35768; <span class="t-c"><span class="mw-geshi cpp source-cpp">VT<span class="sy3">&amp;</span></span></span> &#31867;&#22411;&#21442;&#25968;<span class="t-rev-inl t-since-cxx11"><span>&#65292;&#20134;&#19981;&#20801;&#35768; <span class="t-c"><span class="mw-geshi cpp source-cpp">VT</span></span> &#65292;&#38500;&#38750;&#23545; <code>VT</code> &#32780;&#35328;&#31227;&#21160;&#31561;&#20215;&#20110;&#22797;&#21046;</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span>&#12290; &#8203;</p>
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<tr class="t-par-hitem">
<td colspan="3">&#31867;&#22411;&#35201;&#27714;</td>
</tr>
<tr class="t-par-req">
<td colspan="3">-
<div class="spacer"></div>
<code>ForwardIt</code> &#24517;&#39035;&#28385;&#36275;<a href="cpp-named_req-ForwardIterator.html"><span style="font-style:italic">&#32769;&#24335;&#21521;&#21069;&#36845;&#20195;&#22120;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(LegacyForwardIterator)</span></a> &#30340;&#35201;&#27714;&#12290;</td>
</tr>
<tr class="t-par-req">
<td colspan="3">-
<div class="spacer"></div>
&#35299;&#24341;&#29992; <code>ForwardIt</code> &#32467;&#26524;&#30340;&#31867;&#22411;&#24517;&#39035;&#28385;&#36275;<a href="cpp-named_req-MoveAssignable.html"><span style="font-style:italic">&#21487;&#31227;&#21160;&#36171;&#20540;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(MoveAssignable)</span></a> &#30340;&#35201;&#27714;&#12290;</td>
</tr>
<tr class="t-par-req">
<td colspan="3">-
<div class="spacer"></div>
<code>UnaryPredicate</code> &#24517;&#39035;&#28385;&#36275;<a href="cpp-named_req-Predicate.html"><span style="font-style:italic">&#35859;&#35789;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(Predicate)</span></a> &#30340;&#35201;&#27714;&#12290;</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>&#26032;&#20540;&#33539;&#22260;&#30340;&#23614;&#21518;&#36845;&#20195;&#22120;&#65288;&#33509;&#23427;&#19981;&#26159; <code>end</code> &#65292;&#21017;&#23427;&#25351;&#21521;&#26410;&#25351;&#23450;&#20540;&#65292;&#32780;&#27492;&#36845;&#20195;&#22120;&#19982; <code>end</code> &#20043;&#38388;&#30340;&#36845;&#20195;&#22120;&#25152;&#25351;&#21521;&#30340;&#20219;&#20309;&#20540;&#20134;&#28982;&#65289;&#12290;</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#20934;&#30830;&#24212;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp"><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> &#27425;&#35859;&#35789;&#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#25317;&#26377;&#21517;&#20026; <code>ExecutionPolicy</code> &#30340;&#27169;&#26495;&#24418;&#21442;&#30340;&#37325;&#36733;&#25353;&#19979;&#21015;&#26041;&#24335;&#25253;&#21578;&#38169;&#35823;&#65306;</p>
<ul>
<li>&#33509;&#20316;&#20026;&#31639;&#27861;&#19968;&#37096;&#20998;&#35843;&#29992;&#30340;&#20989;&#25968;&#30340;&#25191;&#34892;&#25243;&#20986;&#24322;&#24120;&#65292;&#19988; <code>ExecutionPolicy</code> &#20026;<a href="cpp-algorithm-execution_policy_tag_t.html">&#26631;&#20934;&#31574;&#30053;</a>&#20043;&#19968;&#65292;&#21017;&#35843;&#29992; <span class="t-lc"><a href="cpp-error-terminate.html">std::terminate</a></span> &#12290;&#23545;&#20110;&#20219;&#20309;&#20854;&#20182; <code>ExecutionPolicy</code> &#65292;&#34892;&#20026;&#26159;&#23454;&#29616;&#23450;&#20041;&#30340;&#12290;</li>
<li>&#33509;&#31639;&#27861;&#26080;&#27861;&#20998;&#37197;&#20869;&#23384;&#65292;&#21017;&#25243;&#20986; <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> &#12290;</li>
</ul>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#35843;&#29992; <code>std::remove</code> &#24120;&#21518;&#38543;&#23481;&#22120;&#30340; <code>erase</code> &#25104;&#21592;&#20989;&#25968;&#65292;&#23427;&#25830;&#38500;&#26410;&#25351;&#23450;&#20540;&#24182;&#20943;&#23567;&#23481;&#22120;&#30340;<i>&#29289;&#29702;</i>&#22823;&#23567;&#20197;&#21305;&#37197;&#20854;&#26032;&#30340;<i>&#36923;&#36753;</i>&#22823;&#23567;&#12290;&#36825;&#20004;&#20010;&#35843;&#29992;&#19968;&#24182;&#34987;&#31216;&#20026;<a href="https://en.wikipedia.org/wiki/Erase-remove_idiom" class="extiw" title="enwiki:Erase-remove idiom"><i>&#25830;&#38500;-&#31227;&#38500;</i>&#25163;&#27861;</a><span class="t-rev-inl t-since-cxx20"><span>&#65292;&#23427;&#21487;&#36890;&#36807;&#23545;&#25152;&#26377;&#26631;&#20934;<i>&#24207;&#21015;</i>&#23481;&#22120;&#37325;&#36733;&#30340; <span class="t-lc">std::erase</span> &#33258;&#30001;&#20989;&#25968;&#65292;&#25110;&#23545;<i>&#25152;&#26377;</i>&#26631;&#20934;&#23481;&#22120;&#37325;&#36733;&#30340; <span class="t-lc">std::erase_if</span> &#33258;&#30001;&#20989;&#25968;&#36798;&#25104;</span> <span><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></span></span>&#12290;</p>
<p>&#21516;&#21517;&#30340;&#23481;&#22120;&#25104;&#21592;&#20989;&#25968; <a href="cpp-container-list-remove.html"><tt>list::remove</tt></a>&#12289; <a href="cpp-container-list-remove.html"><tt>list::remove_if</tt></a>&#12289; <a href="cpp-container-forward_list-remove.html"><tt>forward_list::remove</tt></a> &#21450; <a href="cpp-container-forward_list-remove.html"><tt>forward_list::remove_if</tt></a> &#25830;&#38500;&#34987;&#31227;&#38500;&#30340;&#20803;&#32032;&#12290;</p>
<p>&#36825;&#20123;&#31639;&#27861;&#36890;&#24120;&#19981;&#33021;&#29992;&#20110;&#22914; <span class="t-lc"><a href="cpp-container-set.html">std::set</a></span> &#19982; <span class="t-lc"><a href="cpp-container-map.html">std::map</a></span> &#30340;&#20851;&#32852;&#23481;&#22120;&#65292;&#22240;&#20026;&#20854;&#36845;&#20195;&#22120;&#31867;&#22411;&#19981;&#35299;&#24341;&#29992;&#20026;<a href="cpp-named_req-MoveAssignable.html"><span style="font-style:italic">&#21487;&#31227;&#21160;&#36171;&#20540;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(MoveAssignable)</span></a> &#31867;&#22411;&#65288;&#36825;&#20123;&#23481;&#22120;&#20013;&#30340;&#38190;&#19981;&#21487;&#20462;&#25913;&#65289;&#12290;</p>
<p>&#26631;&#20934;&#24211;&#20134;&#20110; <a href="cpp-header-cstdio.html"><tt>&lt;cstdio&gt;</tt></a> &#23450;&#20041; <a href="cpp-io-c-remove.html"><tt>std::remove</tt></a> &#30340;&#37325;&#36733;&#65292;&#23427;&#25509;&#25910; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span></span></span> &#30340;&#37325;&#36733;&#24182;&#29992;&#20110;&#21024;&#38500;&#25991;&#20214;&#12290;</p>
<p>&#22240;&#20026; <code>std::remove</code> &#20197;&#24341;&#29992;&#25509;&#25910; <code>value</code> &#65292;&#33509;&#24341;&#29992;&#21040;&#33539;&#22260; <code>[first, last)</code> &#20013;&#30340;&#20803;&#32032;&#65292;&#21017;&#23427;&#21487;&#33021;&#26377;&#19981;&#21487;&#39044;&#26399;&#30340;&#34892;&#20026;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">&#21487;&#33021;&#30340;&#23454;&#29616;</span></h3>
<table class="eq-fun-cpp-table">
<tr>
<th>&#29256;&#26412;&#19968;</th>
</tr>
<tr>
<td>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> T <span class="sy1">&gt;</span>
ForwardIt remove<span class="br0">(</span>ForwardIt first, ForwardIt last, <span class="kw4">const</span> T<span class="sy3">&amp;</span> value<span class="br0">)</span>
<span class="br0">{</span>
first <span class="sy1">=</span> <a href="cpp-algorithm-find_if_not.html"><span class="kw1574">std::<span class="me2">find</span></span></a><span class="br0">(</span>first, last, value<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>first <span class="sy3">!</span><span class="sy1">=</span> last<span class="br0">)</span>
<span class="kw1">for</span><span class="br0">(</span>ForwardIt i <span class="sy1">=</span> first<span class="sy4">;</span> <span class="sy2">++</span>i <span class="sy3">!</span><span class="sy1">=</span> last<span class="sy4">;</span> <span class="br0">)</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span><span class="br0">(</span><span class="sy2">*</span>i <span class="sy1">==</span> value<span class="br0">)</span><span class="br0">)</span>
<span class="sy2">*</span>first<span class="sy2">++</span> <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span><span class="sy2">*</span>i<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> first<span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<th>&#29256;&#26412;&#20108;</th>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> ForwardIt, <span class="kw1">class</span> UnaryPredicate<span class="sy1">&gt;</span>
ForwardIt remove_if<span class="br0">(</span>ForwardIt first, ForwardIt last, UnaryPredicate p<span class="br0">)</span>
<span class="br0">{</span>
first <span class="sy1">=</span> <a href="cpp-algorithm-find_if_not.html"><span class="kw1575">std::<span class="me2">find_if</span></span></a><span class="br0">(</span>first, last, p<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>first <span class="sy3">!</span><span class="sy1">=</span> last<span class="br0">)</span>
<span class="kw1">for</span><span class="br0">(</span>ForwardIt i <span class="sy1">=</span> first<span class="sy4">;</span> <span class="sy2">++</span>i <span class="sy3">!</span><span class="sy1">=</span> last<span class="sy4">;</span> <span class="br0">)</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>p<span class="br0">(</span><span class="sy2">*</span>i<span class="br0">)</span><span class="br0">)</span>
<span class="sy2">*</span>first<span class="sy2">++</span> <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span><span class="sy2">*</span>i<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> first<span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<p>&#19979;&#21015;&#20195;&#30721;&#20174; string &#31227;&#38500;&#25152;&#26377;&#31354;&#26684;&#65292;&#36890;&#36807;&#36801;&#31227;&#25152;&#26377;&#38750;&#31354;&#26684;&#23383;&#31526;&#21040;&#24038;&#20391;&#65292;&#20877;&#25830;&#38500;&#20854;&#20182;&#20869;&#23481;&#12290;&#36825;&#26159;<a href="https://en.wikipedia.org/wiki/Erase-remove_idiom" class="extiw" title="enwiki:Erase-remove idiom">&#25830;&#38500;&#31227;&#38500;&#25163;&#27861;</a>&#30340;&#26679;&#20363;&#12290;</p>
<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;algorithm&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cctype&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> str1 <span class="sy1">=</span> <span class="st0">&quot;Text with some spaces&quot;</span><span class="sy4">;</span>
str1.<span class="me1">erase</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">remove</span><span class="br0">(</span>str1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, str1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, <span class="st0">&#39; &#39;</span><span class="br0">)</span>,
str1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> str1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> str2 <span class="sy1">=</span> <span class="st0">&quot;Text<span class="es1">\n</span> with<span class="es1">\t</span>some <span class="es1">\t</span> whitespaces<span class="es1">\n</span><span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
str2.<span class="me1">erase</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">remove_if</span><span class="br0">(</span>str2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>,
str2.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>,
<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">unsigned</span> <span class="kw4">char</span> x<span class="br0">)</span><span class="br0">{</span><span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">isspace</span><span class="br0">(</span>x<span class="br0">)</span><span class="sy4">;</span><span class="br0">}</span><span class="br0">)</span>,
str2.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> str2 <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">Textwithsomespaces
Textwithsomewhitespaces</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-algorithm-remove_copy.html"><span class="t-lines"><span>remove_copy</span><span>remove_copy_if</span></span></a></div>
</div>
</td>
<td>&#22797;&#21046;&#19968;&#20010;&#33539;&#22260;&#30340;&#20803;&#32032;&#65292;&#24573;&#30053;&#28385;&#36275;&#29305;&#23450;&#21028;&#21035;&#26631;&#20934;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-unique.html"><span class="t-lines"><span>unique</span></span></a></div>
</div>
</td>
<td>&#31227;&#38500;&#33539;&#22260;&#20869;&#30340;&#36830;&#32493;&#37325;&#22797;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-remove.html"><span class="t-lines"><span>ranges::remove</span><span>ranges::remove_if</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
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<td>&#31227;&#38500;&#28385;&#36275;&#29305;&#23450;&#21028;&#21035;&#26631;&#20934;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(niebloid)</span></td>
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<div class="visualClear"></div>
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