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<title>std::binomial_distribution<IntType>::binomial_distribution</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_numeric_random_binomial_distribution_binomial_distribution skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::binomial_distribution<IntType>::</span>binomial_distribution</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-numeric.html">numeric</a>‎ | <a href="cpp-numeric-random.html">random</a>‎ | <a href="cpp-numeric-random-binomial_distribution.html">binomial distribution</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">binomial_distribution<span class="br0">(</span><span class="br0">)</span> <span class="sy4">:</span> binomial_distribution<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> binomial_distribution<span class="br0">(</span> IntType t, <span class="kw4">double</span> p <span class="sy1">=</span> <span class="nu16">0.5</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> binomial_distribution<span class="br0">(</span> <span class="kw4">const</span> param_type<span class="sy3">&</span> params <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>构造新的分布对象。 <span class="t-v">(2)</span> 以 <code>t</code> 和 <code>p</code> 为分布参数， <span class="t-v">(3)</span> 以 <code>params</code> 为分布参数。</p>
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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>t</td>
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<td>-</td>
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<td><i>t</i> 分布参数（试验次数）</td>
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<td>p</td>
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<td>-</td>
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<td><i>p</i> 分布参数（试验生成 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 的概率）、</td>
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<td>params</td>
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<td>-</td>
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<td>分布参数集</td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>要求 <span class="texhtml" style="white-space: nowrap;">0 ≤ p ≤ 1</span> 且 <span class="texhtml" style="white-space: nowrap;">0 ≤ t</span> 。</p>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://wg21.link/P0935R0">P0935R0</a></td>
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<td>C++11</td>
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<td>默认构造函数曾为 explicit</td>
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<td>使之为隐式</td>
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