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<title>std::experimental::erase_if (std::multiset)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::</span>erase_if <small>(std::multiset)</small></h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/set&action=edit&redlink=1" class="new" title="cpp/header/experimental/set（页面不存在）"><experimental/set></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> Key, <span class="kw1">class</span> Compare, <span class="kw1">class</span> Alloc, <span class="kw1">class</span> Pred<span class="sy1">></span><br />
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<span class="kw4">void</span> erase_if<span class="br0">(</span><a href="cpp-container-multiset.html"><span class="kw1279">std::<span class="me2">multiset</span></span></a><span class="sy1"><</span>Key,Compare,Alloc<span class="sy1">></span><span class="sy3">&</span> c, Pred pred<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<p>从容器擦除所有满足谓词 <code>pred</code> 的元素。等价于</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">for</span> <span class="br0">(</span><span class="kw4">auto</span> i <span class="sy1">=</span> c.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, last <span class="sy1">=</span> c.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> i <span class="sy3">!</span><span class="sy1">=</span> last<span class="sy4">;</span> <span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">if</span> <span class="br0">(</span>pred<span class="br0">(</span><span class="sy2">*</span>i<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
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i <span class="sy1">=</span> c.<span class="me1">erase</span><span class="br0">(</span>i<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span> <span class="kw1">else</span> <span class="br0">{</span>
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<span class="sy2">++</span>i<span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>c</td>
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<td>-</td>
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<td>要从中擦除的容器</td>
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<td>pred</td>
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<td>-</td>
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<td>确定该擦除哪些元素的谓词</td>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>线性。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <experimental/set></span>
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<span class="co2">#include <iostream></span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">typename</span> Os, <span class="kw1">typename</span> Container<span class="sy1">></span>
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<span class="kw1">inline</span> Os<span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span>Os<span class="sy3">&</span> os, Container <span class="kw4">const</span><span class="sy3">&</span> container<span class="br0">)</span>
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<span class="br0">{</span>
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os <span class="sy1"><<</span> <span class="st0">"{ "</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&</span> item <span class="sy4">:</span> container<span class="br0">)</span> <span class="br0">{</span>
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os <span class="sy1"><<</span> item <span class="sy1"><<</span> <span class="st0">' '</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">return</span> os <span class="sy1"><<</span> <span class="st0">"}"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-container-multiset.html"><span class="kw1279">std::<span class="me2">multiset</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> data <span class="br0">{</span> <span class="nu0">3</span>, <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">5</span>, <span class="nu0">5</span>, <span class="nu0">6</span>, <span class="nu0">6</span>, <span class="nu0">7</span>, <span class="nu0">2</span>, <span class="nu0">1</span>, <span class="nu0">0</span> <span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Original:<span class="es1">\n</span>"</span> <span class="sy1"><<</span> data <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="kw4">auto</span> divisible_by_3 <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">auto</span> <span class="kw4">const</span><span class="sy3">&</span> x<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="br0">(</span>x <span class="sy2">%</span> <span class="nu0">3</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">erase_if</span><span class="br0">(</span>data, divisible_by_3<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Erase all items divisible by 3:<span class="es1">\n</span>"</span> <span class="sy1"><<</span> data <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div class="text source-text">
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<pre class="de1">Original:
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{ 0 1 2 3 3 4 5 5 6 6 7 }
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Erase all items divisible by 3:
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{ 1 2 4 5 5 7 }</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-algorithm-remove.html"><span class="t-lines"><span>remove</span><span>remove_if</span></span></a></div>
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<td>移除满足特定判别标准的元素<br />
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<span class="t-mark">(函数模板)</span></td>
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