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<title>operator<<,>>(std::uniform_int_distribution)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_numeric_random_uniform_int_distribution_operator_ltltgtgt skin-cppreference2 action-view cpp-page-template cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">operator<<,>><small>(std::uniform_int_distribution)</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-numeric.html">numeric</a>‎ | <a href="cpp-numeric-random.html">random</a>‎ | <a href="cpp-numeric-random-uniform_int_distribution.html">uniform int distribution</a></span></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> CharT, <span class="kw1">class</span> Traits <span class="sy1">></span><br /></span>
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<p><span class="kw1">friend</span> <a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1"><<</span><span class="br0">(</span> <a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> ost,<br /></p>
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<span class="kw4">const</span> uniform_int_distribution<span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</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">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">></span><br /></span>
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<p><span class="kw1">friend</span> <a href="cpp-io-basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1">>></span><span class="br0">(</span> <a href="cpp-io-basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> ist,<br /></p>
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uniform_int_distribution<span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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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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<td></td>
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<p>在伪随机数分布 <code>d</code> 上进行流输入与输出。</p>
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<div class="t-li1"><span class="t-li">1)</span> 将分布参数和内部状态作为文本表示写入 <code>ost</code> 。不更改 <code>ost</code> 的格式化标志和填充字符。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以读取自 <code>ist</code> 的数据恢复分布参数和内部状态。不更改 <code>ist</code> 的格式化标志。数据必须用拥有相同本地环境、 <code>CharT</code> 和 <code>Traits</code> 模板形参的流写入，否则行为未定义。若遇到坏输入，则调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">ist.<span class="me1">setstate</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">failbit</span><span class="br0">)</span></span></span> ，它可能抛出 <span class="t-lc"><a href="cpp-io-ios_base-failure.html">std::ios_base::failure</a></span> 。该情况下不更改 <code>d</code> 。</div>
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<p>这些函数模板对通常<a href="cpp-language-unqualified_lookup.html">无限定</a>或<a href="cpp-language-qualified_lookup.html">有限定查找</a>不可见，而只能在 <code>std::uniform_int_distribution<ResultType></code> 为参数的关联类时由<a href="cpp-language-adl.html">实参依赖查找</a>找到。</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>ost</td>
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<td>-</td>
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<td>插入数据到的输出流</td>
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<tr class="t-par">
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<td>ist</td>
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<td>-</td>
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<td>提取数据来源的输入流</td>
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<tr class="t-par">
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<td>d</td>
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<td>-</td>
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<td>伪随机数分布</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<div class="t-li1"><span class="t-li">1)</span> <code>ost</code></div>
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<div class="t-li1"><span class="t-li">2)</span> <code>ist</code></div>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<div class="t-li1"><span class="t-li">1)</span> 可能抛出实现定义的异常。</div>
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<div class="t-li1"><span class="t-li">2)</span> 输入错误时可能抛出 <span class="t-lc"><a href="cpp-io-ios_base-failure.html">std::ios_base::failure</a></span> 。</div>
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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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<table class="dsctable" style="font-size:0.8em">
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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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</tr>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3519">LWG 3519</a></td>
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<td>C++11</td>
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<td>插入与提取运算符的形式未指定</td>
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<td>指定为隐藏友元</td>
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