1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Class template beta_distribution</title> 6<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../boost_random/reference.html#header.boost.random.beta_distribution_hpp" title="Header <boost/random/beta_distribution.hpp>"> 10<link rel="prev" href="bernoulli_distribution/param_type.html" title="Class param_type"> 11<link rel="next" href="beta_distribution/param_type.html" title="Class param_type"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ 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alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.random.beta_distribution"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Class template beta_distribution</span></h2> 30<p>boost::random::beta_distribution</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_random/reference.html#header.boost.random.beta_distribution_hpp" title="Header <boost/random/beta_distribution.hpp>">boost/random/beta_distribution.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> RealType <span class="special">=</span> <span class="keyword">double</span><span class="special">></span> 36<span class="keyword">class</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">{</span> 37<span class="keyword">public</span><span class="special">:</span> 38 <span class="comment">// types</span> 39 <span class="keyword">typedef</span> <span class="identifier">RealType</span> <a name="boost.random.beta_distribution.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> 40 <span class="keyword">typedef</span> <span class="identifier">RealType</span> <a name="boost.random.beta_distribution.input_type"></a><span class="identifier">input_type</span><span class="special">;</span> 41 42 <span class="comment">// member classes/structs/unions</span> 43 44 <span class="keyword">class</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">{</span> 45 <span class="keyword">public</span><span class="special">:</span> 46 <span class="comment">// types</span> 47 <span class="keyword">typedef</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <a class="link" href="beta_distribution/param_type.html#boost.random.beta_distribution.param_type.distribution_type"><span class="identifier">distribution_type</span></a><span class="special">;</span> 48 49 <span class="comment">// <a class="link" href="beta_distribution/param_type.html#boost.random.beta_distribution.param_typeconstruct-copy-destruct">construct/copy/destruct</a></span> 50 <span class="keyword">explicit</span> <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_3-bb"><span class="identifier">param_type</span></a><span class="special">(</span><span class="identifier">RealType</span> <span class="special">=</span> <span class="number">1</span><span class="special">.</span><span class="number">0</span><span class="special">,</span> <span class="identifier">RealType</span> <span class="special">=</span> <span class="number">1</span><span class="special">.</span><span class="number">0</span><span class="special">)</span><span class="special">;</span> 51 52 <span class="comment">// <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_2-bb">public member functions</a></span> 53 <span class="identifier">RealType</span> <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_2_1-bb"><span class="identifier">alpha</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 54 <span class="identifier">RealType</span> <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_2_2-bb"><span class="identifier">beta</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 55 56 <span class="comment">// <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_4-bb">friend functions</a></span> 57 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> 58 <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> 59 <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_4_1-bb"><span class="keyword">operator</span><span class="special"><<</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 60 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> 61 <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> 62 <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_4_2-bb"><span class="keyword">operator</span><span class="special">>></span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 63 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_4_3-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 64 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="beta_distribution/param_type.html#id-1_3_34_5_6_5_1_1_1_3_4_4-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 65 <span class="special">}</span><span class="special">;</span> 66 67 <span class="comment">// <a class="link" href="beta_distribution.html#boost.random.beta_distributionconstruct-copy-destruct">construct/copy/destruct</a></span> 68 <span class="keyword">explicit</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_7-bb"><span class="identifier">beta_distribution</span></a><span class="special">(</span><span class="identifier">RealType</span> <span class="special">=</span> <span class="number">1</span><span class="special">.</span><span class="number">0</span><span class="special">,</span> <span class="identifier">RealType</span> <span class="special">=</span> <span class="number">1</span><span class="special">.</span><span class="number">0</span><span class="special">)</span><span class="special">;</span> 69 <span class="keyword">explicit</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_8-bb"><span class="identifier">beta_distribution</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 70 71 <span class="comment">// <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6-bb">public member functions</a></span> 72 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> URNG<span class="special">></span> <span class="identifier">RealType</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_1-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">URNG</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 73 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> URNG<span class="special">></span> 74 <span class="identifier">RealType</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_2-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">URNG</span> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 75 <span class="identifier">RealType</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_3-bb"><span class="identifier">alpha</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 76 <span class="identifier">RealType</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_4-bb"><span class="identifier">beta</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 77 <span class="identifier">RealType</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_5-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 78 <span class="identifier">RealType</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_6-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 79 <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_7-bb"><span class="identifier">param</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 80 <span class="keyword">void</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_8-bb"><span class="identifier">param</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 81 <span class="keyword">void</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_6_9-bb"><span class="identifier">reset</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 82 83 <span class="comment">// <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_9-bb">friend functions</a></span> 84 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> 85 <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> 86 <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_9_1-bb"><span class="keyword">operator</span><span class="special"><<</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> 87 <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 88 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> 89 <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> 90 <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_9_2-bb"><span class="keyword">operator</span><span class="special">>></span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> 91 <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 92 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_9_3-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 93 <span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="beta_distribution.html#id-1_3_34_5_6_5_1_1_1_9_4-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 94<span class="special">}</span><span class="special">;</span></pre></div> 95<div class="refsect1"> 96<a name="id-1.3.34.5.6.4.3.4"></a><h2>Description</h2> 97<p>The beta distribution is a real-valued distribution which produces values in the range [0, 1]. It has two parameters, alpha and beta.</p> 98<p>It has <span class="inlinemediaobject"><img src="../../images/random//form_0.png"></span>. </p> 99<div class="refsect2"> 100<a name="id-1.3.34.5.6.4.3.4.4"></a><h3> 101<a name="boost.random.beta_distributionconstruct-copy-destruct"></a><code class="computeroutput">beta_distribution</code> 102 public 103 construct/copy/destruct</h3> 104<div class="orderedlist"><ol class="orderedlist" type="1"> 105<li class="listitem"> 106<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_34_5_6_5_1_1_1_7-bb"></a><span class="identifier">beta_distribution</span><span class="special">(</span><span class="identifier">RealType</span> alpha <span class="special">=</span> <span class="number">1</span><span class="special">.</span><span class="number">0</span><span class="special">,</span> <span class="identifier">RealType</span> beta <span class="special">=</span> <span class="number">1</span><span class="special">.</span><span class="number">0</span><span class="special">)</span><span class="special">;</span></pre> 107<p>Constructs an <code class="computeroutput"><code class="computeroutput"><a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a></code></code> from its "alpha" and "beta" parameters.</p> 108<p>Requires: alpha > 0, beta > 0 </p> 109</li> 110<li class="listitem"> 111<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_34_5_6_5_1_1_1_8-bb"></a><span class="identifier">beta_distribution</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span> param<span class="special">)</span><span class="special">;</span></pre> 112<p>Constructs an <code class="computeroutput"><code class="computeroutput"><a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a></code></code> from its parameters. </p> 113</li> 114</ol></div> 115</div> 116<div class="refsect2"> 117<a name="id-1.3.34.5.6.4.3.4.5"></a><h3> 118<a name="id-1_3_34_5_6_5_1_1_1_6-bb"></a><code class="computeroutput">beta_distribution</code> public member functions</h3> 119<div class="orderedlist"><ol class="orderedlist" type="1"> 120<li class="listitem"> 121<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> URNG<span class="special">></span> <span class="identifier">RealType</span> <a name="id-1_3_34_5_6_5_1_1_1_6_1-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">URNG</span> <span class="special">&</span> urng<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 122<p>Returns a random variate distributed according to the beta distribution. </p> 123</li> 124<li class="listitem"> 125<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> URNG<span class="special">></span> 126 <span class="identifier">RealType</span> <a name="id-1_3_34_5_6_5_1_1_1_6_2-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">URNG</span> <span class="special">&</span> urng<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span> param<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 127<p>Returns a random variate distributed accordint to the beta distribution with parameters specified by <code class="computeroutput">param</code>. </p> 128</li> 129<li class="listitem"> 130<pre class="literallayout"><span class="identifier">RealType</span> <a name="id-1_3_34_5_6_5_1_1_1_6_3-bb"></a><span class="identifier">alpha</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 131<p>Returns the "alpha" parameter of the distribution. </p> 132</li> 133<li class="listitem"> 134<pre class="literallayout"><span class="identifier">RealType</span> <a name="id-1_3_34_5_6_5_1_1_1_6_4-bb"></a><span class="identifier">beta</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 135<p>Returns the "beta" parameter of the distribution. </p> 136</li> 137<li class="listitem"> 138<pre class="literallayout"><span class="identifier">RealType</span> <a name="id-1_3_34_5_6_5_1_1_1_6_5-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 139<p>Returns the smallest value that the distribution can produce. </p> 140</li> 141<li class="listitem"> 142<pre class="literallayout"><span class="identifier">RealType</span> <a name="id-1_3_34_5_6_5_1_1_1_6_6-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 143<p>Returns the largest value that the distribution can produce. </p> 144</li> 145<li class="listitem"> 146<pre class="literallayout"><a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <a name="id-1_3_34_5_6_5_1_1_1_6_7-bb"></a><span class="identifier">param</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 147<p>Returns the parameters of the distribution. </p> 148</li> 149<li class="listitem"> 150<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_5_1_1_1_6_8-bb"></a><span class="identifier">param</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&</span> param<span class="special">)</span><span class="special">;</span></pre> 151<p>Sets the parameters of the distribution. </p> 152</li> 153<li class="listitem"> 154<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_34_5_6_5_1_1_1_6_9-bb"></a><span class="identifier">reset</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 155<p>Effects: Subsequent uses of the distribution do not depend on values produced by any engine prior to invoking reset. </p> 156</li> 157</ol></div> 158</div> 159<div class="refsect2"> 160<a name="id-1.3.34.5.6.4.3.4.6"></a><h3> 161<a name="id-1_3_34_5_6_5_1_1_1_9-bb"></a><code class="computeroutput">beta_distribution</code> friend functions</h3> 162<div class="orderedlist"><ol class="orderedlist" type="1"> 163<li class="listitem"> 164<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> 165 <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> 166 <a name="id-1_3_34_5_6_5_1_1_1_9_1-bb"></a><span class="keyword">operator</span><span class="special"><<</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> os<span class="special">,</span> 167 <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span> wd<span class="special">)</span><span class="special">;</span></pre> 168<p>Writes an <code class="computeroutput"><code class="computeroutput"><a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a></code></code> to a <code class="computeroutput">std::ostream</code>. </p> 169</li> 170<li class="listitem"> 171<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span> 172 <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> 173 <a name="id-1_3_34_5_6_5_1_1_1_9_2-bb"></a><span class="keyword">operator</span><span class="special">>></span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> is<span class="special">,</span> 174 <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span> wd<span class="special">)</span><span class="special">;</span></pre> 175<p>Reads an <code class="computeroutput"><code class="computeroutput"><a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a></code></code> from a <code class="computeroutput">std::istream</code>. </p> 176</li> 177<li class="listitem"> 178<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id-1_3_34_5_6_5_1_1_1_9_3-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span> lhs<span class="special">,</span> 179 <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre> 180<p>Returns true if the two instances of <code class="computeroutput"><code class="computeroutput"><a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a></code></code> will return identical sequences of values given equal generators. </p> 181</li> 182<li class="listitem"> 183<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="id-1_3_34_5_6_5_1_1_1_9_4-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span> lhs<span class="special">,</span> 184 <span class="keyword">const</span> <a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre> 185<p>Returns true if the two instances of <code class="computeroutput"><code class="computeroutput"><a class="link" href="beta_distribution.html" title="Class template beta_distribution">beta_distribution</a></code></code> will return different sequences of values given equal generators. </p> 186</li> 187</ol></div> 188</div> 189</div> 190</div> 191<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 192<td align="left"></td> 193<td align="right"><div class="copyright-footer">Copyright © 2000-2005 Jens Maurer<br>Copyright © 2009, 2010 Steven Watanabe<p> 194 Distributed under the Boost Software License, Version 1.0. (See accompanying 195 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 196 </p> 197</div></td> 198</tr></table> 199<hr> 200<div class="spirit-nav"> 201<a accesskey="p" href="bernoulli_distribution/param_type.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_random/reference.html#header.boost.random.beta_distribution_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="beta_distribution/param_type.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 202</div> 203</body> 204</html> 205
