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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>qsort</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-cstdlib.html">&lt;cstdlib&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> qsort<span class="br0">(</span> <span class="kw4">void</span> <span class="sy2">*</span>ptr, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <span class="coMULTI">/*compare-pred*/</span><span class="sy2">*</span> comp <span class="br0">)</span><span class="sy4">;</span><br />
<span class="kw4">void</span> qsort<span class="br0">(</span> <span class="kw4">void</span> <span class="sy2">*</span>ptr, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <span class="coMULTI">/*c-compare-pred*/</span><span class="sy2">*</span> comp <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">extern</span> <span class="st0">&quot;C++&quot;</span> <span class="kw1">using</span> <span class="coMULTI">/*compare-pred*/</span> <span class="sy1">=</span> <span class="kw4">int</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span>, <span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span><br />
<span class="kw4">extern</span> <span class="st0">&quot;C&quot;</span> <span class="kw1">using</span> <span class="coMULTI">/*c-compare-pred*/</span> <span class="sy1">=</span> <span class="kw4">int</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span>, <span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span></span></div>
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<td>(2)</td>
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<p>&#20197;&#21319;&#24207;&#25490;&#24207; <code>ptr</code> &#25152;&#25351;&#21521;&#30340;&#32473;&#23450;&#25968;&#32452;&#12290;&#25968;&#32452;&#21547; <code>count</code> &#20010; <code>size</code> &#23383;&#33410;&#22823;&#23567;&#30340;&#20803;&#32032;&#12290;&#29992; <code>comp</code> &#25152;&#25351;&#21521;&#30340;&#20989;&#25968;&#27604;&#36739;&#23545;&#35937;&#12290;</p>
<p>&#33509; <code>comp</code> &#25351;&#31034;&#20108;&#20010;&#20803;&#32032;&#31561;&#20215;&#65292;&#21017;&#20854;&#39034;&#24207;&#26410;&#25351;&#23450;&#12290;</p>
<p>&#33509;&#25968;&#32452;&#20803;&#32032;&#31867;&#22411;&#19981;&#26159;<span class="t-rev-inl t-until-cxx11"><span><a href="cpp-named_req-PODType.html"><span style="font-style:italic">&#31616;&#26087;&#25968;&#25454;&#31867;&#22411;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(PODType)</span></a></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><a href="cpp-named_req-TriviallyCopyable.html"><span style="font-style:italic">&#21487;&#24179;&#20961;&#22797;&#21046;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(TriviallyCopyable)</span></a> &#31867;&#22411;</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span>&#65292;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>ptr</td>
<td>-</td>
<td>&#25351;&#21521;&#35201;&#25490;&#24207;&#30340;&#25968;&#32452;&#30340;&#25351;&#38024;</td>
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<td>count</td>
<td>-</td>
<td>&#25968;&#32452;&#20803;&#32032;&#25968;</td>
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<td>size</td>
<td>-</td>
<td>&#25968;&#32452;&#20013;&#20803;&#32032;&#30340;&#22823;&#23567;&#65292;&#20197;&#23383;&#33410;&#34920;&#31034;</td>
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<td>comp</td>
<td>-</td>
<td>&#27604;&#36739;&#20989;&#25968;&#12290;&#33509;&#39318;&#20010;&#21442;&#25968;<i>&#23567;&#20110;</i>&#31532;&#20108;&#20010;&#65292;&#21017;&#36820;&#22238;&#36127;&#25972;&#25968;&#20540;&#65292;&#33509;&#39318;&#20010;&#21442;&#25968;<i>&#22823;&#20110;</i>&#31532;&#20108;&#20010;&#65292;&#21017;&#36820;&#22238;&#27491;&#25972;&#25968;&#20540;&#65292;&#33509;&#20004;&#21442;&#25968;&#31561;&#20215;&#65292;&#21017;&#36820;&#22238;&#38646;&#12290;<br />
<p>&#27604;&#36739;&#20989;&#25968;&#30340;&#31614;&#21517;&#24212;&#31561;&#20215;&#20110;&#22914;&#19979;&#24418;&#24335;&#65306;</p>
<p><span class="t-cc"><span class="mw-geshi cpp source-cpp">&nbsp;<span class="kw4">int</span> cmp<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">void</span> <span class="sy2">*</span>a, <span class="kw4">const</span> <span class="kw4">void</span> <span class="sy2">*</span>b<span class="br0">)</span><span class="sy4">;</span></span></span></p>
<p>&#35813;&#20989;&#25968;&#24517;&#39035;&#19981;&#20462;&#25913;&#20256;&#36882;&#32473;&#23427;&#30340;&#23545;&#35937;&#65292;&#32780;&#19988;&#22312;&#35843;&#29992;&#27604;&#36739;&#30456;&#21516;&#23545;&#35937;&#26102;&#24517;&#39035;&#36820;&#22238;&#19968;&#33268;&#30340;&#32467;&#26524;&#65292;&#26080;&#20851;&#20046;&#23427;&#20204;&#22312;&#25968;&#32452;&#20013;&#30340;&#20301;&#32622;&#12290;</p>
<p>&#8203;</p>
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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>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#26080;&#20851;&#20046;&#21517;&#31216;&#65292; C++&#12289; C &#21450; POSIX &#37117;&#19981;&#35201;&#27714;&#27492;&#20989;&#25968;&#29992;<a href="https://en.wikipedia.org/wiki/Quicksort" class="extiw" title="enwiki:Quicksort">&#24555;&#36895;&#25490;&#24207;</a>&#23454;&#29616;&#25110;&#20316;&#20986;&#20219;&#20309;&#22797;&#26434;&#24230;&#21644;&#31283;&#23450;&#24615;&#20445;&#35777;&#12290;</p>
<p>C++ &#26631;&#20934;&#24211;&#25552;&#20379;&#30340;&#20108;&#20010;&#37325;&#36733;&#19981;&#21516;&#65292;&#22240;&#20026;&#21442;&#25968; <code>comp</code> &#31867;&#22411;&#26377;&#21035;&#65288;<a href="cpp-language-language_linkage.html">&#35821;&#35328;&#38142;&#25509;</a>&#26159;&#31867;&#22411;&#30340;&#19968;&#37096;&#20998;&#65289;&#12290;</p>
<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;&#29992; <code>qsort()</code> &#25490;&#24207;&#25972;&#25968;&#25968;&#32452;&#12290;</p>
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cstdlib&gt;</span>
<span class="co2">#include &lt;climits&gt;</span>
<span class="co2">#include &lt;compare&gt;</span>
<span class="co2">#include &lt;array&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a> a <span class="br0">{</span> <span class="sy2">-</span><span class="nu0">2</span>, <span class="nu0">99</span>, <span class="nu0">0</span>, <span class="sy2">-</span><span class="nu0">743</span>, <a href="cpp-types-climits.html"><span class="kw398">INT_MAX</span></a>, <span class="nu0">2</span>, <a href="cpp-types-climits.html"><span class="kw393">INT_MIN</span></a>, <span class="nu0">4</span> <span class="br0">}</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">qsort</span><span class="br0">(</span>
a.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span>,
a.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span>,
sizeof<span class="br0">(</span>decltype<span class="br0">(</span>a<span class="br0">)</span><span class="sy4">::</span><span class="me2">value_type</span><span class="br0">)</span>,
<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span> x, <span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span> y<span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">const</span> <span class="kw4">int</span> arg1 <span class="sy1">=</span> <span class="sy2">*</span><span class="kw1">static_cast</span><span class="sy1">&lt;</span><span class="kw4">const</span> <span class="kw4">int</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span>x<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">int</span> arg2 <span class="sy1">=</span> <span class="sy2">*</span><span class="kw1">static_cast</span><span class="sy1">&lt;</span><span class="kw4">const</span> <span class="kw4">int</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span>y<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">auto</span> cmp <span class="sy1">=</span> arg1 <span class="sy1">&lt;=&gt;</span> arg2<span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>cmp <span class="sy1">&lt;</span> <span class="nu0">0</span><span class="br0">)</span> <span class="kw1">return</span> <span class="sy2">-</span><span class="nu0">1</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>cmp <span class="sy1">&gt;</span> <span class="nu0">0</span><span class="br0">)</span> <span class="kw1">return</span> <span class="nu0">1</span><span class="sy4">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> ai <span class="sy4">:</span> a<span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> ai <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<div class="text source-text">
<pre class="de1">-2147483648 -743 -2 0 2 4 99</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-bsearch.html"><span class="t-lines"><span>bsearch</span></span></a></div>
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<td>&#22312;&#26410;&#25351;&#23450;&#31867;&#22411;&#30340;&#25968;&#32452;&#20013;&#25628;&#32034;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-sort.html"><span class="t-lines"><span>sort</span></span></a></div>
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<td>&#23558;&#33539;&#22260;&#25353;&#21319;&#24207;&#25490;&#24207;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-types-is_trivial.html"><span class="t-lines"><span>is_trivial</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
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<td>&#26816;&#26597;&#31867;&#22411;&#26159;&#21542;&#24179;&#20961;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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</table>
</div>
<div class="visualClear"></div>
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