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<title>std::basic_string&lt;CharT,Traits,Allocator&gt;::clear</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_string&lt;CharT,Traits,Allocator&gt;::</span>clear</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-string.html">string</a>&lrm; | <a href="cpp-string-basic_string.html">basic string</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> clear<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> clear<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<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="kw4">constexpr</span> <span class="kw4">void</span> clear<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</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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<p>&#22914;&#21516;&#36890;&#36807;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp">erase<span class="br0">(</span>begin<span class="br0">(</span><span class="br0">)</span>, end<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> &#20174; string &#31227;&#38500;&#25152;&#26377;&#23383;&#31526;&#12290;</p>
<p>&#38750;&#27861;&#21270;&#25152;&#26377;&#25351;&#38024;&#12289;&#24341;&#29992;&#21450;&#36845;&#20195;&#22120;&#12290;</p>
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<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#19981;&#21516;&#20110; <span class="t-lc"><a href="cpp-container-vector-clear.html">std::vector::clear</a></span> &#65292; C++ &#26631;&#20934;&#19981;&#26174;&#24335;&#35201;&#27714;&#27492;&#20989;&#25968;&#19981;&#26356;&#25913; <span class="t-lc"><a href="cpp-string-basic_string-capacity.html">capacity</a></span> &#65292;&#20294;&#26082;&#23384;&#23454;&#29616;&#37117;&#19981;&#26356;&#25913;&#23481;&#37327;&#12290;&#36825;&#24847;&#21619;&#30528;&#23427;&#20204;&#19981;&#37322;&#25918;&#20998;&#37197;&#30340;&#20869;&#23384;&#65288;&#21442;&#38405; <span class="t-lc"><a href="cpp-string-basic_string-shrink_to_fit.html">shrink_to_fit</a></span> &#65289;&#12290;</p>
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<p>&#19982; string &#22823;&#23567;&#25104;&#32447;&#24615;&#65292;&#23613;&#31649;&#26082;&#23384;&#23454;&#29616;&#22312;&#24120;&#25968;&#26102;&#38388;&#20869;&#25805;&#20316;&#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;cassert&gt;</span>
<span class="co2">#include &lt;string&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> s<span class="br0">{</span> <span class="st0">&quot;Exemplar&quot;</span> <span class="br0">}</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">string</span><span class="sy4">::</span><span class="me2">size_type</span> <span class="kw4">const</span> capacity <span class="sy1">=</span> s.<span class="me1">capacity</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
s.<span class="me1">clear</span><span class="br0">(</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>s.<span class="me1">capacity</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> capacity<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>s.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</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>s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></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-string-basic_string-erase.html"><span class="t-lines"><span>erase</span></span></a></div>
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<td>&#31227;&#38500;&#23383;&#31526;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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