<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.15"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>libstdc++: std::random_device Class Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtreedata.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> /* @license 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$(document).ready(function(){initNavTree('a06292.html','');}); /* @license-end */ </script> <div id="doc-content"> <div class="header"> <div class="summary"> <a href="#pub-types">Public Types</a> | <a href="#pub-methods">Public Member Functions</a> | <a href="#pub-static-methods">Static Public Member Functions</a> | <a href="a06289.html">List of all members</a> </div> <div class="headertitle"> <div class="title">std::random_device Class Reference<div class="ingroups"><a class="el" href="a01473.html">Numerics</a> » <a class="el" href="a01491.html">Random Number Generation</a> » <a class="el" href="a01531.html">Random Number Generators</a></div></div> </div> </div><!--header--> <div class="contents"> <table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a> Public Types</h2></td></tr> <tr class="memitem:a26ac3786bd3a188268ded69f800c9dd1"><td class="memItemLeft" align="right" valign="top">typedef unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="a06292.html#a26ac3786bd3a188268ded69f800c9dd1">result_type</a></td></tr> <tr class="separator:a26ac3786bd3a188268ded69f800c9dd1"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a> Public Member Functions</h2></td></tr> <tr class="memitem:a0d6340abe765e84a0f55bcba6490de4c"><td class="memItemLeft" align="right" valign="top"><a id="a0d6340abe765e84a0f55bcba6490de4c"></a>  </td><td class="memItemRight" valign="bottom"><b>random_device</b> (const <a class="el" href="a01506.html#ga32db3d9898c44d3b3a578b560f7758cc">std::string</a> &__token="mt19937")</td></tr> <tr class="separator:a0d6340abe765e84a0f55bcba6490de4c"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a884123203d4054a2bfbb9a90dc3cceea"><td class="memItemLeft" align="right" valign="top"><a id="a884123203d4054a2bfbb9a90dc3cceea"></a>  </td><td class="memItemRight" valign="bottom"><b>random_device</b> (const <a class="el" href="a06292.html">random_device</a> &)=delete</td></tr> <tr class="separator:a884123203d4054a2bfbb9a90dc3cceea"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a67be9b0c9184c9bc6266719a47fc0029"><td class="memItemLeft" align="right" valign="top"><a id="a67be9b0c9184c9bc6266719a47fc0029"></a> double </td><td class="memItemRight" valign="bottom"><b>entropy</b> () const noexcept</td></tr> <tr class="separator:a67be9b0c9184c9bc6266719a47fc0029"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ad1507444f41e579bf69c3f04770cc817"><td class="memItemLeft" align="right" valign="top"><a id="ad1507444f41e579bf69c3f04770cc817"></a> <a class="el" href="a06292.html#a26ac3786bd3a188268ded69f800c9dd1">result_type</a> </td><td class="memItemRight" valign="bottom"><b>operator()</b> ()</td></tr> <tr class="separator:ad1507444f41e579bf69c3f04770cc817"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a943e37c6f2f78a6c4fb85ac1742b79ea"><td class="memItemLeft" align="right" valign="top"><a id="a943e37c6f2f78a6c4fb85ac1742b79ea"></a> void </td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="a06292.html">random_device</a> &)=delete</td></tr> <tr class="separator:a943e37c6f2f78a6c4fb85ac1742b79ea"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a> Static Public Member Functions</h2></td></tr> <tr class="memitem:a6a208ccdcdb6b2fde868fbcece538aa6"><td class="memItemLeft" align="right" valign="top"><a id="a6a208ccdcdb6b2fde868fbcece538aa6"></a> static constexpr <a class="el" href="a06292.html#a26ac3786bd3a188268ded69f800c9dd1">result_type</a> </td><td class="memItemRight" valign="bottom"><b>max</b> ()</td></tr> <tr class="separator:a6a208ccdcdb6b2fde868fbcece538aa6"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a014f52f681bfb8363f58d1b265dc92b0"><td class="memItemLeft" align="right" valign="top"><a id="a014f52f681bfb8363f58d1b265dc92b0"></a> static constexpr <a class="el" href="a06292.html#a26ac3786bd3a188268ded69f800c9dd1">result_type</a> </td><td class="memItemRight" valign="bottom"><b>min</b> ()</td></tr> <tr class="separator:a014f52f681bfb8363f58d1b265dc92b0"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <div class="textblock"><p>A standard interface to a platform-specific non-deterministic random number generator (if any are available). </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l01560">1560</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div><h2 class="groupheader">Member Typedef Documentation</h2> <a id="a26ac3786bd3a188268ded69f800c9dd1"></a> <h2 class="memtitle"><span class="permalink"><a href="#a26ac3786bd3a188268ded69f800c9dd1">◆ </a></span>result_type</h2> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef unsigned int <a class="el" href="a06292.html#a26ac3786bd3a188268ded69f800c9dd1">std::random_device::result_type</a></td> </tr> </table> </div><div class="memdoc"> <p>The type of the generated random value. </p> <p class="definition">Definition at line <a class="el" href="a00452_source.html#l01564">1564</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p> </div> </div> <hr/>The documentation for this class was generated from the following file:<ul> <li><a class="el" href="a00452_source.html">random.h</a></li> </ul> </div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="navelem"><a class="el" href="a01538.html">std</a></li><li 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