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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_0103a8ad82dcc2c51f5cde661b4b5cb7.html">xrpl</a></li><li class="navelem"><a class="el" href="dir_f534ca90a4985f34ab325acfbcd39b84.html">basics</a></li> </ul>
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<div class="headertitle"><div class="title">include/xrpl/basics/random.h</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#ifndef XRPL_BASICS_RANDOM_H_INCLUDED</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#define XRPL_BASICS_RANDOM_H_INCLUDED</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include &lt;xrpl/beast/utility/instrumentation.h&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include &lt;xrpl/beast/xor_shift_engine.h&gt;</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/cstddef.html">cstddef</a>&gt;</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/cstdint.html">cstdint</a>&gt;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/limits.html">limits</a>&gt;</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/mutex.html">mutex</a>&gt;</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/random.html">random</a>&gt;</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a>&gt;</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceripple.html">ripple</a> {</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#ifndef __INTELLISENSE__</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="keyword">static_assert</span>(</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_integral.html">std::is_integral&lt;beast::xor_shift_engine::result_type&gt;::value</a> &amp;&amp;</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_unsigned.html">std::is_unsigned&lt;beast::xor_shift_engine::result_type&gt;::value</a>,</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <span class="stringliteral">&quot;The Ripple default PRNG engine must return an unsigned integral type.&quot;</span>);</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">static_assert</span>(</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits/max.html">std::numeric_limits&lt;beast::xor_shift_engine::result_type&gt;::max</a>() &gt;=</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits/max.html">std::numeric_limits&lt;std::uint64_t&gt;::max</a>(),</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <span class="stringliteral">&quot;The Ripple default PRNG engine return must be at least 64 bits wide.&quot;</span>);</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment">// Determines if a type can be called like an Engine</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Engine, <span class="keyword">class</span> Result = <span class="keyword">typename</span> Engine::result_type&gt;</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"><a class="line" href="namespaceripple_1_1detail.html#afc38aa9ea5bbed77a9d15119fe3ad676"> 32</a></span><span class="keyword">using </span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_invocable.html">is_engine</a> = <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_invocable.html">std::is_invocable_r&lt;Result, Engine&gt;</a>;</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="keyword">inline</span> <a class="code hl_class" href="classbeast_1_1detail_1_1xor__shift__engine.html">beast::xor_shift_engine</a>&amp;</div>
<div class="foldopen" id="foldopen00046" data-start="{" data-end="}">
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"><a class="line" href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de"> 46</a></span><a class="code hl_function" href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de">default_prng</a>()</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span>{</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// This is used to seed the thread-specific PRNGs on demand</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">static</span> <a class="code hl_class" href="classbeast_1_1detail_1_1xor__shift__engine.html">beast::xor_shift_engine</a> seeder = [] {</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/numeric/random/random_device.html">std::random_device</a> rng;</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/numeric/random/uniform_int_distribution.html">std::uniform_int_distribution&lt;std::uint64_t&gt;</a> distribution{1};</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">return</span> <a class="code hl_typedef" href="namespacebeast.html#a3a89b040ab5ccff1b2ce7692464c6a48">beast::xor_shift_engine</a>(distribution(rng));</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> }();</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> </div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="comment">// This protects the seeder</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">static</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/thread/mutex.html">std::mutex</a> m;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// The thread-specific PRNGs:</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keyword">thread_local</span> <a class="code hl_class" href="classbeast_1_1detail_1_1xor__shift__engine.html">beast::xor_shift_engine</a> engine = [] {</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> seed;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a> lk(m);</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/numeric/random/uniform_int_distribution.html">std::uniform_int_distribution&lt;std::uint64_t&gt;</a> distribution{1};</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> seed = distribution(seeder);</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> }</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classbeast_1_1detail_1_1xor__shift__engine.html">beast::xor_shift_engine</a>{seed};</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> }();</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">return</span> engine;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span>}</div>
</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Engine, <span class="keyword">class</span> Integral&gt;</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t</a>&lt;</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_integral.html">std::is_integral&lt;Integral&gt;::value</a> &amp;&amp; detail::is_engine&lt;Engine&gt;::value,</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> Integral&gt;</div>
<div class="foldopen" id="foldopen00096" data-start="{" data-end="}">
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"><a class="line" href="namespaceripple.html#a7e8c5e8439747ed61273789c9940d5b7"> 96</a></span><a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(Engine&amp; engine, Integral min, Integral max)</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span>{</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> XRPL_ASSERT(max &gt; min, <span class="stringliteral">&quot;ripple::rand_int : max over min inputs&quot;</span>);</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="comment">// This should have no state and constructing it should</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <span class="comment">// be very cheap. If that turns out not to be the case</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="comment">// it could be hand-optimized.</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::uniform_int_distribution&lt;Integral&gt;</a>(min, max)(engine);</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span>}</div>
</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> </div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Integral&gt;</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t&lt;std::is_integral&lt;Integral&gt;::value</a>, Integral&gt;</div>
<div class="foldopen" id="foldopen00108" data-start="{" data-end="}">
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"><a class="line" href="namespaceripple.html#a201c1de23cbce2b5ba49a6f96b96f9aa"> 108</a></span><a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(Integral min, Integral max)</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span>{</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(<a class="code hl_function" href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de">default_prng</a>(), min, max);</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span>}</div>
</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Engine, <span class="keyword">class</span> Integral&gt;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t</a>&lt;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_integral.html">std::is_integral&lt;Integral&gt;::value</a> &amp;&amp; detail::is_engine&lt;Engine&gt;::value,</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> Integral&gt;</div>
<div class="foldopen" id="foldopen00117" data-start="{" data-end="}">
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"><a class="line" href="namespaceripple.html#a0503294c3be3aff83a13e2a51a74f675"> 117</a></span><a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(Engine&amp; engine, Integral max)</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span>{</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(engine, Integral(0), max);</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span>}</div>
</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Integral&gt;</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t&lt;std::is_integral&lt;Integral&gt;::value</a>, Integral&gt;</div>
<div class="foldopen" id="foldopen00124" data-start="{" data-end="}">
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"><a class="line" href="namespaceripple.html#a004db52c5945c192ecca58e224ceb5f8"> 124</a></span><a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(Integral max)</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span>{</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(<a class="code hl_function" href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de">default_prng</a>(), max);</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span>}</div>
</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Integral, <span class="keyword">class</span> Engine&gt;</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t</a>&lt;</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_integral.html">std::is_integral&lt;Integral&gt;::value</a> &amp;&amp; detail::is_engine&lt;Engine&gt;::value,</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> Integral&gt;</div>
<div class="foldopen" id="foldopen00133" data-start="{" data-end="}">
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"><a class="line" href="namespaceripple.html#a8a5b5f5fa34f990853c3e197a8704f73"> 133</a></span><a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(Engine&amp; engine)</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span>{</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(engine, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits&lt;Integral&gt;::max</a>());</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span>}</div>
</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> </div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Integral = <span class="keywordtype">int</span>&gt;</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t&lt;std::is_integral&lt;Integral&gt;::value</a>, Integral&gt;</div>
<div class="foldopen" id="foldopen00140" data-start="{" data-end="}">
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"><a class="line" href="namespaceripple.html#a1747b036b81bd3769995670092912976"> 140</a></span><a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>()</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span>{</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(<a class="code hl_function" href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de">default_prng</a>(), <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits&lt;Integral&gt;::max</a>());</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span>}</div>
</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Byte, <span class="keyword">class</span> Engine&gt;</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t</a>&lt;</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> (<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same&lt;Byte, unsigned char&gt;::value</a> ||</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same&lt;Byte, std::uint8_t&gt;::value</a>) &amp;&amp;</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> detail::is_engine&lt;Engine&gt;::value,</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> Byte&gt;</div>
<div class="foldopen" id="foldopen00154" data-start="{" data-end="}">
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"><a class="line" href="namespaceripple.html#a7ea35455d341aef7e7f1b6efb83f26ab"> 154</a></span><a class="code hl_function" href="namespaceripple.html#a07f252d7421718e945f09463c3c8d255">rand_byte</a>(Engine&amp; engine)</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span>{</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>Byte<span class="keyword">&gt;</span>(rand_int&lt;Engine, std::uint32_t&gt;(</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> engine,</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits&lt;Byte&gt;::min</a>(),</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits&lt;Byte&gt;::max</a>()));</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span>}</div>
</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> </div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Byte = std::u<span class="keywordtype">int</span>8_t&gt;</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t</a>&lt;</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> (<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same&lt;Byte, unsigned char&gt;::value</a> ||</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same&lt;Byte, std::uint8_t&gt;::value</a>),</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> Byte&gt;</div>
<div class="foldopen" id="foldopen00167" data-start="{" data-end="}">
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"><a class="line" href="namespaceripple.html#a07f252d7421718e945f09463c3c8d255"> 167</a></span><a class="code hl_function" href="namespaceripple.html#a07f252d7421718e945f09463c3c8d255">rand_byte</a>()</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span>{</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="keywordflow">return</span> rand_byte&lt;Byte&gt;(<a class="code hl_function" href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de">default_prng</a>());</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span>}</div>
</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Engine&gt;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span><span class="keyword">inline</span> <span class="keywordtype">bool</span></div>
<div class="foldopen" id="foldopen00177" data-start="{" data-end="}">
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"><a class="line" href="namespaceripple.html#a37fc7093cfe63d4e2cab63d40aa813dd"> 177</a></span><a class="code hl_function" href="namespaceripple.html#ad7f6ed671155855d566c0adb954b188b">rand_bool</a>(Engine&amp; engine)</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span>{</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#a1747b036b81bd3769995670092912976">rand_int</a>(engine, 1) == 1;</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span>}</div>
</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span><span class="keyword">inline</span> <span class="keywordtype">bool</span></div>
<div class="foldopen" id="foldopen00183" data-start="{" data-end="}">
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"><a class="line" href="namespaceripple.html#ad7f6ed671155855d566c0adb954b188b"> 183</a></span><a class="code hl_function" href="namespaceripple.html#ad7f6ed671155855d566c0adb954b188b">rand_bool</a>()</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span>{</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad7f6ed671155855d566c0adb954b188b">rand_bool</a>(<a class="code hl_function" href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de">default_prng</a>());</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span>}</div>
</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span>} <span class="comment">// namespace ripple</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> </div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span><span class="preprocessor">#endif </span><span class="comment">// XRPL_BASICS_RANDOM_H_INCLUDED</span></div>
<div class="ttc" id="aclassbeast_1_1detail_1_1xor__shift__engine_html"><div class="ttname"><a href="classbeast_1_1detail_1_1xor__shift__engine.html">beast::detail::xor_shift_engine</a></div><div class="ttdef"><b>Definition</b> <a href="xor__shift__engine_8h_source.html#l00013">xor_shift_engine.h:14</a></div></div>
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<div class="ttc" id="anamespacebeast_html_a3a89b040ab5ccff1b2ce7692464c6a48"><div class="ttname"><a href="namespacebeast.html#a3a89b040ab5ccff1b2ce7692464c6a48">beast::xor_shift_engine</a></div><div class="ttdeci">detail::xor_shift_engine&lt;&gt; xor_shift_engine</div><div class="ttdoc">XOR-shift Generator.</div><div class="ttdef"><b>Definition</b> <a href="xor__shift__engine_8h_source.html#l00095">xor_shift_engine.h:95</a></div></div>
<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition</b> <a href="algorithm_8h_source.html#l00006">algorithm.h:6</a></div></div>
<div class="ttc" id="anamespaceripple_html_a07f252d7421718e945f09463c3c8d255"><div class="ttname"><a href="namespaceripple.html#a07f252d7421718e945f09463c3c8d255">ripple::rand_byte</a></div><div class="ttdeci">std::enable_if_t&lt;(std::is_same&lt; Byte, unsigned char &gt;::value||std::is_same&lt; Byte, std::uint8_t &gt;::value), Byte &gt; rand_byte()</div><div class="ttdef"><b>Definition</b> <a href="include_2xrpl_2basics_2random_8h_source.html#l00167">include/xrpl/basics/random.h:167</a></div></div>
<div class="ttc" id="anamespaceripple_html_a1747b036b81bd3769995670092912976"><div class="ttname"><a href="namespaceripple.html#a1747b036b81bd3769995670092912976">ripple::rand_int</a></div><div class="ttdeci">std::enable_if_t&lt; std::is_integral&lt; Integral &gt;::value, Integral &gt; rand_int()</div><div class="ttdef"><b>Definition</b> <a href="include_2xrpl_2basics_2random_8h_source.html#l00140">include/xrpl/basics/random.h:140</a></div></div>
<div class="ttc" id="anamespaceripple_html_ad7f6ed671155855d566c0adb954b188b"><div class="ttname"><a href="namespaceripple.html#ad7f6ed671155855d566c0adb954b188b">ripple::rand_bool</a></div><div class="ttdeci">bool rand_bool()</div><div class="ttdef"><b>Definition</b> <a href="include_2xrpl_2basics_2random_8h_source.html#l00183">include/xrpl/basics/random.h:183</a></div></div>
<div class="ttc" id="anamespaceripple_html_afe66a903fefc1f0613602efe9e2283de"><div class="ttname"><a href="namespaceripple.html#afe66a903fefc1f0613602efe9e2283de">ripple::default_prng</a></div><div class="ttdeci">beast::xor_shift_engine &amp; default_prng()</div><div class="ttdoc">Return the default random engine.</div><div class="ttdef"><b>Definition</b> <a href="include_2xrpl_2basics_2random_8h_source.html#l00046">include/xrpl/basics/random.h:46</a></div></div>
<div class="ttc" id="anumeric_limits_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits</a></div></div>
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<div class="ttc" id="arandom_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/random.html">random</a></div></div>
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