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  25 <div class="refentry">
  26 <a name="boost.compute.discrete_distribution"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Class template discrete_distribution</span></h2>
  29 <p>boost::compute::discrete_distribution &#8212; Produces random integers on the interval [0, n), where probability of each integer is given by the weight of the ith integer divided by the sum of all weights. </p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_compute/reference.html#header.boost.compute.random.discrete_distribution_hpp" title="Header &lt;boost/compute/random/discrete_distribution.hpp&gt;">boost/compute/random/discrete_distribution.hpp</a>&gt;
  33
  34 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> IntType <span class="special">=</span> <span class="identifier">uint_</span><span class="special">&gt;</span>
  35 <span class="keyword">class</span> <a class="link" href="discrete_distribution.html" title="Class template discrete_distribution">discrete_distribution</a> <span class="special">{</span>
  36 <span class="keyword">public</span><span class="special">:</span>
  37   <span class="comment">// types</span>
  38   <span class="keyword">typedef</span> <span class="identifier">IntType</span> <a name="boost.compute.discrete_distribution.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
  39
  40   <span class="comment">// <a class="link" href="discrete_distribution.html#boost.compute.discrete_distributionconstruct-copy-destruct">construct/copy/destruct</a></span>
  41   <a class="link" href="discrete_distribution.html#idm46009691916480-bb"><span class="identifier">discrete_distribution</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  42   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> InputIterator<span class="special">&gt;</span>
  43     <a class="link" href="discrete_distribution.html#idm46009691915680-bb"><span class="identifier">discrete_distribution</span></a><span class="special">(</span><span class="identifier">InputIterator</span><span class="special">,</span> <span class="identifier">InputIterator</span><span class="special">)</span><span class="special">;</span>
  44   <a class="link" href="discrete_distribution.html#idm46009691911808-bb"><span class="special">~</span><span class="identifier">discrete_distribution</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  45
  46   <span class="comment">// <a class="link" href="discrete_distribution.html#idm46009691927904-bb">public member functions</a></span>
  47   <span class="special">::</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="keyword">double</span> <span class="special">&gt;</span> <a class="link" href="discrete_distribution.html#idm46009691927344-bb"><span class="identifier">probabilities</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  48   <span class="identifier">result_type</span> <span class="identifier">min</span> <a class="link" href="discrete_distribution.html#idm46009691925920-bb"><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  49   <span class="identifier">result_type</span> <span class="identifier">max</span> <a class="link" href="discrete_distribution.html#idm46009691924464-bb"><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  50   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> OutputIterator<span class="special">,</span> <span class="keyword">typename</span> Generator<span class="special">&gt;</span>
  51     <span class="keyword">void</span> <a class="link" href="discrete_distribution.html#idm46009691923008-bb"><span class="identifier">generate</span></a><span class="special">(</span><span class="identifier">OutputIterator</span><span class="special">,</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="identifier">Generator</span> <span class="special">&amp;</span><span class="special">,</span>
  52                   <span class="identifier">command_queue</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  53
  54   <span class="comment">// <a class="link" href="discrete_distribution.html#idm46009691910496-bb">private member functions</a></span>
  55    <a class="link" href="discrete_distribution.html#idm46009691909920-bb"><span class="identifier">BOOST_STATIC_ASSERT_MSG</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_integral</span><span class="special">&lt;</span> <span class="identifier">IntType</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">value</span><span class="special">,</span>
  56                            <span class="string">"Template argument must be integral"</span><span class="special">)</span><span class="special">;</span>
  57 <span class="special">}</span><span class="special">;</span></pre></div>
  58 <div class="refsect1">
  59 <a name="idm46113317133376"></a><h2>Description</h2>
  60 <p>The following example shows how to setup a discrete distribution to produce 0 and 1 with equal probability</p>
  61 <pre class="programlisting"></pre>
  62 <div class="refsect2">
  63 <a name="idm46113317132048"></a><h3>
  64 <a name="boost.compute.discrete_distributionconstruct-copy-destruct"></a><code class="computeroutput">discrete_distribution</code>
  65         public
  66        construct/copy/destruct</h3>
  67 <div class="orderedlist"><ol class="orderedlist" type="1">
  68 <li class="listitem">
  69 <pre class="literallayout"><a name="idm46009691916480-bb"></a><span class="identifier">discrete_distribution</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  70 <p>Creates a new discrete distribution with a single weight p = { 1 }. This distribution produces only zeroes. </p>
  71 </li>
  72 <li class="listitem">
  73 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> InputIterator<span class="special">&gt;</span>
  74   <a name="idm46009691915680-bb"></a><span class="identifier">discrete_distribution</span><span class="special">(</span><span class="identifier">InputIterator</span> first<span class="special">,</span> <span class="identifier">InputIterator</span> last<span class="special">)</span><span class="special">;</span></pre>
  75 <p>Creates a new discrete distribution with weights given by the range [<code class="computeroutput">first</code>, <code class="computeroutput">last</code>). </p>
  76 </li>
  77 <li class="listitem">
  78 <pre class="literallayout"><a name="idm46009691911808-bb"></a><span class="special">~</span><span class="identifier">discrete_distribution</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Destroys the <code class="computeroutput"><a class="link" href="discrete_distribution.html" title="Class template discrete_distribution">discrete_distribution</a></code> object. </li>
  79 </ol></div>
  80 </div>
  81 <div class="refsect2">
  82 <a name="idm46113317112768"></a><h3>
  83 <a name="idm46009691927904-bb"></a><code class="computeroutput">discrete_distribution</code> public member functions</h3>
  84 <div class="orderedlist"><ol class="orderedlist" type="1">
  85 <li class="listitem">
  86 <pre class="literallayout"><span class="special">::</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="keyword">double</span> <span class="special">&gt;</span> <a name="idm46009691927344-bb"></a><span class="identifier">probabilities</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns the probabilities. </li>
  87 <li class="listitem">
  88 <pre class="literallayout"><span class="identifier">result_type</span> <span class="identifier">min</span> <a name="idm46009691925920-bb"></a><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns the minimum potentially generated value. </li>
  89 <li class="listitem">
  90 <pre class="literallayout"><span class="identifier">result_type</span> <span class="identifier">max</span> <a name="idm46009691924464-bb"></a><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns the maximum potentially generated value. </li>
  91 <li class="listitem">
  92 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> OutputIterator<span class="special">,</span> <span class="keyword">typename</span> Generator<span class="special">&gt;</span>
  93   <span class="keyword">void</span> <a name="idm46009691923008-bb"></a><span class="identifier">generate</span><span class="special">(</span><span class="identifier">OutputIterator</span> first<span class="special">,</span> <span class="identifier">OutputIterator</span> last<span class="special">,</span>
  94                 <span class="identifier">Generator</span> <span class="special">&amp;</span> generator<span class="special">,</span> <span class="identifier">command_queue</span> <span class="special">&amp;</span> queue<span class="special">)</span><span class="special">;</span></pre>
  95 <p>Generates uniformly distributed integers and stores them to the range [<code class="computeroutput">first</code>, <code class="computeroutput">last</code>). </p>
  96 </li>
  97 </ol></div>
  98 </div>
  99 <div class="refsect2">
 100 <a name="idm46113317078128"></a><h3>
 101 <a name="idm46009691910496-bb"></a><code class="computeroutput">discrete_distribution</code> private member functions</h3>
 102 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"> <a name="idm46009691909920-bb"></a><span class="identifier">BOOST_STATIC_ASSERT_MSG</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_integral</span><span class="special">&lt;</span> <span class="identifier">IntType</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">value</span><span class="special">,</span>
 103                          <span class="string">"Template argument must be integral"</span><span class="special">)</span><span class="special">;</span></pre></li></ol></div>
 104 </div>
 105 </div>
 106 </div>
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 108 <td align="left"></td>
 109 <td align="right"><div class="copyright-footer">Copyright &#169; 2013, 2014 Kyle Lutz<p>
 110         Distributed under the Boost Software License, Version 1.0. (See accompanying
 111         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>)
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