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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>discrete_distribution</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-numeric.html">numeric</a>&lrm; | <a href="cpp-numeric-random.html">random</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-random.html">&lt;random&gt;</a></code></div>
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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> IntType <span class="sy1">=</span> <span class="kw4">int</span> <span class="sy1">&gt;</span><br />
<span class="kw1">class</span> discrete_distribution<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p><code>std::discrete_distribution</code> &#20135;&#29983;&#21306;&#38388; <code>[0, n)</code> &#19978;&#30340;&#38543;&#26426;&#25972;&#25968;&#65292;&#20854;&#20013;&#27599;&#20010;&#21333;&#29420;&#25972;&#25968; <code>i</code> &#30340;&#27010;&#29575;&#23450;&#20041;&#20026; <span class="texhtml" style="white-space: nowrap;">w<span class="t-su t-su-b"><br />
i</span>/S</span> &#65292;&#21363;&#31532; <code>i</code> &#20010;&#25972;&#25968;&#30340;<i>&#26435;&#37325;</i>&#38500;&#20197;&#25152;&#26377; <code>n</code> &#20010;&#26435;&#37325;&#30340;&#21644;&#12290;</p>
<p><code>std::discrete_distribution</code> &#28385;&#36275;<a href="cpp-named_req-RandomNumberDistribution.html"><span style="font-style:italic">&#38543;&#26426;&#25968;&#20998;&#24067;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(RandomNumberDistribution)</span></a> &#30340;&#25152;&#26377;&#35201;&#27714;&#12290;</p>
<h3><span class="mw-headline" id=".E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">&#27169;&#26495;&#24418;&#21442;</span></h3>
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<td>IntType</td>
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<td>&#29983;&#25104;&#22120;&#25152;&#29983;&#25104;&#30340;&#32467;&#26524;&#31867;&#22411;&#12290;&#33509;&#23427;&#19981;&#26159; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">short</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">long</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">short</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">int</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span></span></span> &#20043;&#19968;&#21017;&#25928;&#26524;&#26410;&#23450;&#20041;&#12290;</td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">&#25104;&#21592;&#31867;&#22411;</span></h3>
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<td>&#25104;&#21592;&#31867;&#22411;</td>
<td>&#23450;&#20041;</td>
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<td><code>result_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">IntType</span></span></td>
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<td><code>param_type</code><span class="t-mark-rev t-since-cxx11">(C++11)</span></td>
<td>&#21442;&#25968;&#38598;&#30340;&#31867;&#22411;&#65292;&#35265;<a href="cpp-named_req-RandomNumberDistribution.html"><span style="font-style:italic">&#38543;&#26426;&#25968;&#20998;&#24067;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(RandomNumberDistribution)</span></a> &#12290;</td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-numeric-random-discrete_distribution-discrete_distribution.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#26500;&#36896;&#26032;&#20998;&#24067;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-numeric-random-discrete_distribution-reset.html"><span class="t-lines"><span>reset</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#37325;&#32622;&#20998;&#24067;&#30340;&#20869;&#37096;&#29366;&#24577;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h5><span class="mw-headline" id=".E7.94.9F.E6.88.90">&#29983;&#25104;</span></h5>
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<div><a href="cpp-numeric-random-discrete_distribution-operator().html"><span class="t-lines"><span>operator()</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#29983;&#25104;&#20998;&#24067;&#20013;&#30340;&#19979;&#20010;&#38543;&#26426;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h5><span class="mw-headline" id=".E7.89.B9.E5.BE.81">&#29305;&#24449;</span></h5>
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<div><a href="cpp-numeric-random-discrete_distribution-probabilities.html"><span class="t-lines"><span>probabilities</span></span></a></div>
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<td>&#33719;&#24471;&#27010;&#29575;&#21015;&#34920;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-numeric-random-discrete_distribution-param.html"><span class="t-lines"><span>param</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#33719;&#21462;&#25110;&#35774;&#32622;&#38543;&#26426;&#21442;&#25968;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-numeric-random-discrete_distribution-min.html"><span class="t-lines"><span>min</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#36820;&#22238;&#26368;&#23567;&#30340;&#28508;&#22312;&#29983;&#25104;&#20540;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-numeric-random-discrete_distribution-max.html"><span class="t-lines"><span>max</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#36820;&#22238;&#26368;&#22823;&#30340;&#28508;&#22312;&#29983;&#25104;&#20540;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#38750;&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div><a href="cpp-numeric-random-discrete_distribution-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-until-cxx20">(C++20 &#20013;&#31227;&#38500;)</span></span></span></div>
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<td>&#27604;&#36739;&#20004;&#20010;&#20998;&#24067;&#23545;&#35937;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-numeric-random-discrete_distribution-operator_ltltgtgt.html"><span class="t-lines"><span>operator&lt;&lt;</span><span>operator&gt;&gt;</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#25191;&#34892;&#20266;&#38543;&#26426;&#25968;&#20998;&#24067;&#30340;&#27969;&#36755;&#20837;&#21644;&#36755;&#20986;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
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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;map&gt;</span>
<span class="co2">#include &lt;random&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-numeric-random-random_device.html"><span class="kw1486">std::<span class="me2">random_device</span></span></a> rd<span class="sy4">;</span>
<a href="cpp-numeric-random-mersenne_twister_engine.html"><span class="kw1489">std::<span class="me2">mt19937</span></span></a> gen<span class="br0">(</span>rd<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">discrete_distribution</span><span class="sy1">&lt;&gt;</span> d<span class="br0">(</span><span class="br0">{</span><span class="nu0">40</span>, <span class="nu0">10</span>, <span class="nu0">10</span>, <span class="nu0">40</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-container-map.html"><span class="kw1281">std::<span class="me2">map</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="kw4">int</span><span class="sy1">&gt;</span> m<span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n<span class="sy1">=</span><span class="nu0">0</span><span class="sy4">;</span> n<span class="sy1">&lt;</span><span class="nu0">10000</span><span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span> <span class="br0">{</span>
<span class="sy2">++</span>m<span class="br0">[</span>d<span class="br0">(</span>gen<span class="br0">)</span><span class="br0">]</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">auto</span> p <span class="sy4">:</span> m<span class="br0">)</span> <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> p.<span class="me1">first</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; generated &quot;</span> <span class="sy1">&lt;&lt;</span> p.<span class="me1">second</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; times<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">0 generated 4028 times
1 generated 978 times
2 generated 1012 times
3 generated 3982 times</pre></div>
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