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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Random123-1.09: Random123/conventional/Engine.hpp Source File</title>
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<div class="tabs"><ul class="tablist"><li style="padding-left: 1.5em; font-weight: bold">Random123-1.09  Documentation</li></ul></div>
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<h1>Random123/conventional/Engine.hpp</h1>  </div>
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<a href="Engine_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">Copyright 2010-2011, D. E. Shaw Research.</span>
<a name="l00003"></a>00003 <span class="comment">All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment">modification, are permitted provided that the following conditions are</span>
<a name="l00007"></a>00007 <span class="comment">met:</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment">* Redistributions of source code must retain the above copyright</span>
<a name="l00010"></a>00010 <span class="comment">  notice, this list of conditions, and the following disclaimer.</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment">* Redistributions in binary form must reproduce the above copyright</span>
<a name="l00013"></a>00013 <span class="comment">  notice, this list of conditions, and the following disclaimer in the</span>
<a name="l00014"></a>00014 <span class="comment">  documentation and/or other materials provided with the distribution.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment">* Neither the name of D. E. Shaw Research nor the names of its</span>
<a name="l00017"></a>00017 <span class="comment">  contributors may be used to endorse or promote products derived from</span>
<a name="l00018"></a>00018 <span class="comment">  this software without specific prior written permission.</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment">THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00021"></a>00021 <span class="comment">&quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00022"></a>00022 <span class="comment">LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00023"></a>00023 <span class="comment">A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00024"></a>00024 <span class="comment">OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00025"></a>00025 <span class="comment">SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00026"></a>00026 <span class="comment">LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00027"></a>00027 <span class="comment">DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00028"></a>00028 <span class="comment">THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00029"></a>00029 <span class="comment">(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00030"></a>00030 <span class="comment">OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00031"></a>00031 <span class="comment">*/</span>
<a name="l00032"></a>00032 <span class="preprocessor">#ifndef __Engine_dot_hpp_</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor">#define __Engine_dot_hpp_</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include &quot;../features/compilerfeatures.h&quot;</span>
<a name="l00036"></a>00036 <span class="preprocessor">#include &quot;../array.h&quot;</span>
<a name="l00037"></a>00037 <span class="preprocessor">#include &lt;limits&gt;</span>
<a name="l00038"></a>00038 <span class="preprocessor">#include &lt;stdexcept&gt;</span>
<a name="l00039"></a>00039 <span class="preprocessor">#include &lt;sstream&gt;</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include &lt;algorithm&gt;</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include &lt;vector&gt;</span>
<a name="l00042"></a>00042 <span class="preprocessor">#if R123_USE_CXX11_TYPE_TRAITS</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span><span class="preprocessor">#include &lt;type_traits&gt;</span>
<a name="l00044"></a>00044 <span class="preprocessor">#endif</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span>
<a name="l00046"></a>00046 <span class="keyword">namespace </span>r123{
<a name="l00067"></a>00067 <span class="keyword">template</span>&lt;<span class="keyword">typename</span> CBRNG&gt;
<a name="l00068"></a><a class="code" href="structr123_1_1Engine.html">00068</a> <span class="keyword">struct </span><a class="code" href="structr123_1_1Engine.html">Engine</a> {
<a name="l00069"></a><a class="code" href="structr123_1_1Engine.html#a45ee0086cf8cd6d10febb76dc88f8b22">00069</a>     <span class="keyword">typedef</span> CBRNG cbrng_type;
<a name="l00070"></a><a class="code" href="structr123_1_1Engine.html#a96e0f5f039d5efd6aae77b63bafaad90">00070</a>     <span class="keyword">typedef</span> <span class="keyword">typename</span> CBRNG::ctr_type ctr_type;
<a name="l00071"></a><a class="code" href="structr123_1_1Engine.html#a18132a79d2327990c4809b37300eddc3">00071</a>     <span class="keyword">typedef</span> <span class="keyword">typename</span> CBRNG::key_type key_type;
<a name="l00072"></a><a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">00072</a>     <span class="keyword">typedef</span> <span class="keyword">typename</span> CBRNG::ukey_type ukey_type;
<a name="l00073"></a><a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">00073</a>     <span class="keyword">typedef</span> <span class="keyword">typename</span> ctr_type::value_type result_type;
<a name="l00074"></a><a class="code" href="structr123_1_1Engine.html#a8fb9eb1ab76ad9b5374a47cf84ecd306">00074</a>     <span class="keyword">typedef</span> <span class="keywordtype">size_t</span> elem_type;
<a name="l00075"></a>00075 
<a name="l00076"></a>00076 <span class="keyword">protected</span>:
<a name="l00077"></a><a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">00077</a>     <a class="code" href="structr123_1_1Engine.html#a45ee0086cf8cd6d10febb76dc88f8b22">cbrng_type</a> <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>;
<a name="l00078"></a><a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">00078</a>     <a class="code" href="structr123_1_1Engine.html#a18132a79d2327990c4809b37300eddc3">key_type</a> <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a>;
<a name="l00079"></a><a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">00079</a>     <a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a> <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00080"></a><a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">00080</a>     <a class="code" href="structr123_1_1Engine.html#a96e0f5f039d5efd6aae77b63bafaad90">ctr_type</a> <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>;
<a name="l00081"></a><a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">00081</a>     <a class="code" href="structr123_1_1Engine.html#a8fb9eb1ab76ad9b5374a47cf84ecd306">elem_type</a> <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>;
<a name="l00082"></a><a class="code" href="structr123_1_1Engine.html#a6169d4fbce1fd7725fabda4c693bf250">00082</a>     <a class="code" href="structr123_1_1Engine.html#a96e0f5f039d5efd6aae77b63bafaad90">ctr_type</a> <a class="code" href="structr123_1_1Engine.html#a6169d4fbce1fd7725fabda4c693bf250">v</a>;
<a name="l00083"></a>00083 
<a name="l00084"></a><a class="code" href="structr123_1_1Engine.html#aa7ad87d7238a0f820ee37640071dee7d">00084</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#aa7ad87d7238a0f820ee37640071dee7d">fix_invariant</a>(){
<a name="l00085"></a>00085         <span class="keywordflow">if</span>( <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> != 0 ) {
<a name="l00086"></a>00086             <a class="code" href="structr123_1_1Engine.html#a6169d4fbce1fd7725fabda4c693bf250">v</a> = <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>, <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a>);
<a name="l00087"></a>00087         }
<a name="l00088"></a>00088     }        
<a name="l00089"></a>00089 <span class="keyword">public</span>:
<a name="l00090"></a><a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">00090</a>     <span class="keyword">explicit</span> <a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">Engine</a>() : <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(), <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>(), <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>() {
<a name="l00091"></a>00091         <a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a> x = {{}};
<a name="l00092"></a>00092         <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a> = x;
<a name="l00093"></a>00093         <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a> = <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00094"></a>00094     }
<a name="l00095"></a><a class="code" href="structr123_1_1Engine.html#ae1a249af828cfdac77db6c16e3f8f8eb">00095</a>     <span class="keyword">explicit</span> <a class="code" href="structr123_1_1Engine.html#ae1a249af828cfdac77db6c16e3f8f8eb">Engine</a>(<a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">result_type</a> r) : <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(), <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>(), <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>() {
<a name="l00096"></a>00096         <a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a> x = {{<span class="keyword">typename</span> ukey_type::value_type(r)}};
<a name="l00097"></a>00097         <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a> = x;
<a name="l00098"></a>00098         <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a> = <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00099"></a>00099     }
<a name="l00100"></a>00100     <span class="comment">// 26.5.3 says that the SeedSeq templates shouldn&#39;t particpate in</span>
<a name="l00101"></a>00101     <span class="comment">// overload resolution unless the type qualifies as a SeedSeq.</span>
<a name="l00102"></a>00102     <span class="comment">// How that is determined is unspecified, except that &quot;as a</span>
<a name="l00103"></a>00103     <span class="comment">// minimum a type shall not qualify as a SeedSeq if it is</span>
<a name="l00104"></a>00104     <span class="comment">// implicitly convertible to a result_type.&quot;  </span>
<a name="l00105"></a>00105     <span class="comment">//</span>
<a name="l00106"></a>00106     <span class="comment">// First, we make sure that even the non-const copy constructor</span>
<a name="l00107"></a>00107     <span class="comment">// works as expected.  In addition, if we&#39;ve got C++0x</span>
<a name="l00108"></a>00108     <span class="comment">// type_traits, we use enable_if and is_convertible to implement</span>
<a name="l00109"></a>00109     <span class="comment">// the convertible-to-result_type restriction.  Otherwise, the</span>
<a name="l00110"></a>00110     <span class="comment">// template is unconditional and will match in some surpirsing</span>
<a name="l00111"></a>00111     <span class="comment">// and undesirable situations.</span>
<a name="l00112"></a><a class="code" href="structr123_1_1Engine.html#a37dd55cee849b59d678f74780f785672">00112</a>     <a class="code" href="structr123_1_1Engine.html#a37dd55cee849b59d678f74780f785672">Engine</a>(<a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; e) : <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(e.<a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>), <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>(e.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>), <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>(e.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>), <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>(e.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>){
<a name="l00113"></a>00113         <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a> = <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00114"></a>00114         <a class="code" href="structr123_1_1Engine.html#aa7ad87d7238a0f820ee37640071dee7d">fix_invariant</a>();
<a name="l00115"></a>00115     }
<a name="l00116"></a><a class="code" href="structr123_1_1Engine.html#a478b486b166316597a51ffdd7b5b2d0c">00116</a>     <a class="code" href="structr123_1_1Engine.html#a478b486b166316597a51ffdd7b5b2d0c">Engine</a>(<span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; e) : <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(e.<a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>), <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>(e.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>), <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>(e.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>), <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>(e.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>){
<a name="l00117"></a>00117         <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a> = <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00118"></a>00118         <a class="code" href="structr123_1_1Engine.html#aa7ad87d7238a0f820ee37640071dee7d">fix_invariant</a>();
<a name="l00119"></a>00119     }
<a name="l00120"></a>00120 
<a name="l00121"></a>00121     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SeedSeq&gt;
<a name="l00122"></a><a class="code" href="structr123_1_1Engine.html#a52b968cfefe413441d668b3013de023a">00122</a>     <span class="keyword">explicit</span> <a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">Engine</a>(SeedSeq &amp;s
<a name="l00123"></a>00123 #<span class="keywordflow">if</span> R123_USE_CXX11_TYPE_TRAITS
<a name="l00124"></a>00124                     , <span class="keyword">typename</span> std::enable_if&lt;!std::is_convertible&lt;SeedSeq, result_type&gt;::value&gt;::type* =0
<a name="l00125"></a>00125 #endif
<a name="l00126"></a>00126                     )
<a name="l00127"></a>00127         : <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(), <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>(), <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>() {
<a name="l00128"></a>00128         <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a> = <a class="code" href="structr123_1_1Engine.html#aff36bc97d11bc66f6c0edb75d8dc88e5">ukey_type::seed</a>(s);
<a name="l00129"></a>00129         <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a> = <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00130"></a>00130     }
<a name="l00131"></a><a class="code" href="structr123_1_1Engine.html#a93429593bdb12b202b4b8ed38fe08bc4">00131</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#a93429593bdb12b202b4b8ed38fe08bc4">seed</a>(<a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">result_type</a> r){
<a name="l00132"></a>00132         *<span class="keyword">this</span> = <a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">Engine</a>(r);
<a name="l00133"></a>00133     }
<a name="l00134"></a>00134     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SeedSeq&gt;
<a name="l00135"></a><a class="code" href="structr123_1_1Engine.html#ac4d05ee820a1eb70e76cabb14645dad4">00135</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#aff36bc97d11bc66f6c0edb75d8dc88e5">seed</a>(SeedSeq &amp;s
<a name="l00136"></a>00136 #<span class="keywordflow">if</span> R123_USE_CXX11_TYPE_TRAITS
<a name="l00137"></a>00137                     , <span class="keyword">typename</span> std::enable_if&lt;!std::is_convertible&lt;SeedSeq, result_type&gt;::value&gt;::type* =0
<a name="l00138"></a>00138 #endif
<a name="l00139"></a>00139               ){ 
<a name="l00140"></a>00140         *<span class="keyword">this</span> = <a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">Engine</a>(s);
<a name="l00141"></a>00141     }
<a name="l00142"></a><a class="code" href="structr123_1_1Engine.html#aff36bc97d11bc66f6c0edb75d8dc88e5">00142</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#aff36bc97d11bc66f6c0edb75d8dc88e5">seed</a>(){
<a name="l00143"></a>00143         *<span class="keyword">this</span> = <a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">Engine</a>();
<a name="l00144"></a>00144     }
<a name="l00145"></a><a class="code" href="structr123_1_1Engine.html#a606e3ba824542e52f12df1345126e721">00145</a>     <span class="keyword">friend</span> <span class="keywordtype">bool</span> <a class="code" href="structr123_1_1Engine.html#a606e3ba824542e52f12df1345126e721">operator==</a>(<span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; lhs, <span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; rhs){
<a name="l00146"></a>00146         <span class="keywordflow">return</span> lhs.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>==rhs.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a> &amp;&amp; lhs.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> == rhs.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> &amp;&amp; lhs.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a> == rhs.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00147"></a>00147     }
<a name="l00148"></a><a class="code" href="structr123_1_1Engine.html#af0947cdcfc03aef7ec30c9fafa660445">00148</a>     <span class="keyword">friend</span> <span class="keywordtype">bool</span> <a class="code" href="structr123_1_1Engine.html#af0947cdcfc03aef7ec30c9fafa660445">operator!=</a>(<span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; lhs, <span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; rhs){
<a name="l00149"></a>00149         <span class="keywordflow">return</span> lhs.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>!=rhs.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a> || lhs.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> != rhs.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> || lhs.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>!=rhs.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00150"></a>00150     }
<a name="l00151"></a>00151 
<a name="l00152"></a><a class="code" href="structr123_1_1Engine.html#ae0321571f689fca00c608d11ecad7d8d">00152</a>     <span class="keyword">friend</span> std::ostream&amp; <a class="code" href="structr123_1_1Engine.html#ae0321571f689fca00c608d11ecad7d8d">operator&lt;&lt;</a>(std::ostream&amp; os, <span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; be){
<a name="l00153"></a>00153         <span class="keywordflow">return</span> os &lt;&lt; be.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; be.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; be.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>;
<a name="l00154"></a>00154     }
<a name="l00155"></a>00155 
<a name="l00156"></a><a class="code" href="structr123_1_1Engine.html#ae708b771ab5ac17700d34bad875a16d9">00156</a>     <span class="keyword">friend</span> std::istream&amp; <a class="code" href="structr123_1_1Engine.html#ae708b771ab5ac17700d34bad875a16d9">operator&gt;&gt;</a>(std::istream&amp; is, <a class="code" href="structr123_1_1Engine.html">Engine</a>&amp; be){
<a name="l00157"></a>00157         is &gt;&gt; be.<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a> &gt;&gt; be.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a> &gt;&gt; be.<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>;
<a name="l00158"></a>00158         be.<a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a> = be.<a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00159"></a>00159         be.<a class="code" href="structr123_1_1Engine.html#aa7ad87d7238a0f820ee37640071dee7d">fix_invariant</a>();
<a name="l00160"></a>00160         <span class="keywordflow">return</span> is;
<a name="l00161"></a>00161     }
<a name="l00162"></a>00162 
<a name="l00163"></a>00163     <span class="comment">// The &lt;random&gt; shipped with MacOS Xcode 4.5.2 imposes a</span>
<a name="l00164"></a>00164     <span class="comment">// non-standard requirement that URNGs also have static data</span>
<a name="l00165"></a>00165     <span class="comment">// members: _Min and _Max.  Later versions of libc++ impose the</span>
<a name="l00166"></a>00166     <span class="comment">// requirement only when constexpr isn&#39;t supported.  Although the</span>
<a name="l00167"></a>00167     <span class="comment">// Xcode 4.5.2 requirement is clearly non-standard, it is unlikely</span>
<a name="l00168"></a>00168     <span class="comment">// to be fixed and it is very easy work around.  We certainly</span>
<a name="l00169"></a>00169     <span class="comment">// don&#39;t want to go to great lengths to accommodate every buggy</span>
<a name="l00170"></a>00170     <span class="comment">// library we come across, but in this particular case, the effort</span>
<a name="l00171"></a>00171     <span class="comment">// is low and the benefit is high, so it&#39;s worth doing.  Thanks to</span>
<a name="l00172"></a>00172     <span class="comment">// Yan Zhou for pointing this out to us.  See similar code in</span>
<a name="l00173"></a>00173     <span class="comment">// ../MicroURNG.hpp</span>
<a name="l00174"></a><a class="code" href="structr123_1_1Engine.html#aa73e4d27847915f1438fd37b30777111">00174</a>     <span class="keyword">const</span> <span class="keyword">static</span> <a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">result_type</a> <a class="code" href="structr123_1_1Engine.html#aa73e4d27847915f1438fd37b30777111">_Min</a> = 0;
<a name="l00175"></a><a class="code" href="structr123_1_1Engine.html#ae549f81e966b0414bcaf0f24b566ebd8">00175</a>     <span class="keyword">const</span> <span class="keyword">static</span> <a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">result_type</a> <a class="code" href="structr123_1_1Engine.html#ae549f81e966b0414bcaf0f24b566ebd8">_Max</a> = ~((result_type)0);
<a name="l00176"></a>00176 
<a name="l00177"></a><a class="code" href="structr123_1_1Engine.html#af5441fc62932c3d099f8b16150d2aa81">00177</a>     <span class="keyword">static</span> R123_CONSTEXPR <a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">result_type</a> min <a class="code" href="structr123_1_1Engine.html#af5441fc62932c3d099f8b16150d2aa81">R123_NO_MACRO_SUBST</a> () { <span class="keywordflow">return</span> <a class="code" href="structr123_1_1Engine.html#aa73e4d27847915f1438fd37b30777111">_Min</a>; }
<a name="l00178"></a><a class="code" href="structr123_1_1Engine.html#a112318f7d0015ecf4c3c6a8a5c76371b">00178</a>     <span class="keyword">static</span> R123_CONSTEXPR <a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">result_type</a> max <a class="code" href="structr123_1_1Engine.html#a112318f7d0015ecf4c3c6a8a5c76371b">R123_NO_MACRO_SUBST</a> () { <span class="keywordflow">return</span> <a class="code" href="structr123_1_1Engine.html#ae549f81e966b0414bcaf0f24b566ebd8">_Max</a>; }
<a name="l00179"></a>00179 
<a name="l00180"></a><a class="code" href="structr123_1_1Engine.html#aca309d0b4f2a8fff1f6f2ab38c6caf93">00180</a>     <a class="code" href="structr123_1_1Engine.html#a3d7cb66d43f99f5e227990af985ecb45">result_type</a> <a class="code" href="structr123_1_1Engine.html#aca309d0b4f2a8fff1f6f2ab38c6caf93">operator()</a>(){
<a name="l00181"></a>00181         <span class="keywordflow">if</span>( <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>.size() == 1 )     <span class="comment">// short-circuit the scalar case.  Compilers aren&#39;t mind-readers.</span>
<a name="l00182"></a>00182             <span class="keywordflow">return</span> <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>.incr(), <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a>)[0];
<a name="l00183"></a>00183         <span class="keywordflow">if</span>( <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> == 0 ){
<a name="l00184"></a>00184             <a class="code" href="structr123_1_1Engine.html#a6169d4fbce1fd7725fabda4c693bf250">v</a> = <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>.incr(), <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a>);
<a name="l00185"></a>00185             <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> = <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>.size();
<a name="l00186"></a>00186         }
<a name="l00187"></a>00187         <span class="keywordflow">return</span> <a class="code" href="structr123_1_1Engine.html#a6169d4fbce1fd7725fabda4c693bf250">v</a>[--<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>];
<a name="l00188"></a>00188     }
<a name="l00189"></a>00189 
<a name="l00190"></a><a class="code" href="structr123_1_1Engine.html#a82a56c2c02b146dceb68ef3fd0a969fb">00190</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#a82a56c2c02b146dceb68ef3fd0a969fb">discard</a>(R123_ULONG_LONG skip){
<a name="l00191"></a>00191         <span class="comment">// don&#39;t forget:  elem counts down</span>
<a name="l00192"></a>00192         <span class="keywordtype">size_t</span> nelem = <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>.size();
<a name="l00193"></a>00193         <span class="keywordtype">size_t</span> sub = skip % nelem;
<a name="l00194"></a>00194         skip /= nelem;
<a name="l00195"></a>00195         <span class="keywordflow">if</span> (<a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> &lt; sub) {
<a name="l00196"></a>00196             <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> += nelem;
<a name="l00197"></a>00197             skip++;
<a name="l00198"></a>00198         }
<a name="l00199"></a>00199         <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> -= sub;
<a name="l00200"></a>00200         <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>.incr(skip);
<a name="l00201"></a>00201         <a class="code" href="structr123_1_1Engine.html#aa7ad87d7238a0f820ee37640071dee7d">fix_invariant</a>();
<a name="l00202"></a>00202     }
<a name="l00203"></a>00203          
<a name="l00204"></a>00204     <span class="comment">//--------------------------</span>
<a name="l00205"></a>00205     <span class="comment">// Some bonus methods, not required for a Random Number</span>
<a name="l00206"></a>00206     <span class="comment">// Engine</span>
<a name="l00207"></a>00207 
<a name="l00208"></a>00208     <span class="comment">// Constructors and seed() method for ukey_type seem useful</span>
<a name="l00209"></a>00209     <span class="comment">// We need const and non-const to supersede the SeedSeq template.</span>
<a name="l00210"></a><a class="code" href="structr123_1_1Engine.html#ab5f45b4eb97995cc45350abee3ec8388">00210</a>     <span class="keyword">explicit</span> <a class="code" href="structr123_1_1Engine.html#ab5f45b4eb97995cc45350abee3ec8388">Engine</a>(<span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a> &amp;uk) : <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a>(uk), <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>(uk), <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>(), <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>(){}
<a name="l00211"></a><a class="code" href="structr123_1_1Engine.html#aeb178b9305cbf1fb7e11e8e33a631ba7">00211</a>     <span class="keyword">explicit</span> <a class="code" href="structr123_1_1Engine.html#aeb178b9305cbf1fb7e11e8e33a631ba7">Engine</a>(<a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a> &amp;uk) : <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a>(uk), <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>(uk), <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>(), <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>(){}
<a name="l00212"></a><a class="code" href="structr123_1_1Engine.html#a5c4d68dbbccfc71f467f3c902f5b93da">00212</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#a5c4d68dbbccfc71f467f3c902f5b93da">seed</a>(<span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a>&amp; uk){
<a name="l00213"></a>00213         *<span class="keyword">this</span> = <a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">Engine</a>(uk);
<a name="l00214"></a>00214     }        
<a name="l00215"></a><a class="code" href="structr123_1_1Engine.html#a7bd6d3417cefb904c879f41d2c29e15e">00215</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#a7bd6d3417cefb904c879f41d2c29e15e">seed</a>(<a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a>&amp; uk){
<a name="l00216"></a>00216         *<span class="keyword">this</span> = <a class="code" href="structr123_1_1Engine.html#ac5676bbe189b0cdc1bef0dd812262ccd">Engine</a>(uk);
<a name="l00217"></a>00217     }        
<a name="l00218"></a>00218 
<a name="l00219"></a>00219     <span class="comment">// Forward the e(counter) to the CBRNG we are templated</span>
<a name="l00220"></a>00220     <span class="comment">// on, using the current value of the key.</span>
<a name="l00221"></a><a class="code" href="structr123_1_1Engine.html#af396a7d1656af55805e38f3d9c0fbef7">00221</a>     <a class="code" href="structr123_1_1Engine.html#a96e0f5f039d5efd6aae77b63bafaad90">ctr_type</a> <a class="code" href="structr123_1_1Engine.html#af396a7d1656af55805e38f3d9c0fbef7">operator()</a>(<span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html#a96e0f5f039d5efd6aae77b63bafaad90">ctr_type</a>&amp; <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>)<span class="keyword"> const</span>{
<a name="l00222"></a>00222         <span class="keywordflow">return</span> <a class="code" href="structr123_1_1Engine.html#a5e430e850badcc4fd0f74de4a49a673b">b</a>(c, <a class="code" href="structr123_1_1Engine.html#adb9e1841a81f213a115e9f092f5c4654">key</a>);
<a name="l00223"></a>00223     }
<a name="l00224"></a>00224 
<a name="l00225"></a>00225     <span class="comment">// Since you can seed *this with a ukey_type, it seems reasonable</span>
<a name="l00226"></a>00226     <span class="comment">// to allow the caller to know what seed/ukey *this is using.</span>
<a name="l00227"></a><a class="code" href="structr123_1_1Engine.html#aa7812a494fdb677c2e325db0acfe924a">00227</a>     <a class="code" href="structr123_1_1Engine.html#a32973bdda8697bcbb4dde11c0366a5e3">ukey_type</a> <a class="code" href="structr123_1_1Engine.html#aa7812a494fdb677c2e325db0acfe924a">getseed</a>()<span class="keyword"> const</span>{
<a name="l00228"></a>00228         <span class="keywordflow">return</span> <a class="code" href="structr123_1_1Engine.html#a11a79253c3a7b07e697f7bf4c7edb52f">ukey</a>;
<a name="l00229"></a>00229     }
<a name="l00230"></a>00230 
<a name="l00231"></a>00231     <span class="comment">// Maybe the caller want&#39;s to know the details of</span>
<a name="l00232"></a>00232     <span class="comment">// the internal state, e.g., so it can call a different</span>
<a name="l00233"></a>00233     <span class="comment">// bijection with the same counter.</span>
<a name="l00234"></a><a class="code" href="structr123_1_1Engine.html#a621df886f2a21ffb22e63d9094389173">00234</a>     std::pair&lt;ctr_type, elem_type&gt; <a class="code" href="structr123_1_1Engine.html#a621df886f2a21ffb22e63d9094389173">getcounter</a>()<span class="keyword"> const </span>{
<a name="l00235"></a>00235         <span class="keywordflow">return</span> make_pair(<a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>,  <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a>);
<a name="l00236"></a>00236     }
<a name="l00237"></a>00237 
<a name="l00238"></a>00238     <span class="comment">// And the inverse.</span>
<a name="l00239"></a><a class="code" href="structr123_1_1Engine.html#a6104bf5ee89450403379d5680bfae172">00239</a>     <span class="keywordtype">void</span> <a class="code" href="structr123_1_1Engine.html#a6104bf5ee89450403379d5680bfae172">setcounter</a>(<span class="keyword">const</span> <a class="code" href="structr123_1_1Engine.html#a96e0f5f039d5efd6aae77b63bafaad90">ctr_type</a>&amp; _c, <a class="code" href="structr123_1_1Engine.html#a8fb9eb1ab76ad9b5374a47cf84ecd306">elem_type</a> _elem){
<a name="l00240"></a>00240         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> nelem = <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a>.size();
<a name="l00241"></a>00241         <span class="keywordflow">if</span>( <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> &gt; nelem )
<a name="l00242"></a>00242             <span class="keywordflow">throw</span> std::range_error(<span class="stringliteral">&quot;Engine::setcounter called  with elem out of range&quot;</span>);
<a name="l00243"></a>00243         <a class="code" href="structr123_1_1Engine.html#afb056ed93053f4175aabc9f4e5dd7b8d">c</a> = _c;
<a name="l00244"></a>00244         <a class="code" href="structr123_1_1Engine.html#a7b40128e9dc7427cd13d27477647b319">elem</a> = _elem;
<a name="l00245"></a>00245         <a class="code" href="structr123_1_1Engine.html#aa7ad87d7238a0f820ee37640071dee7d">fix_invariant</a>();
<a name="l00246"></a>00246     }
<a name="l00247"></a>00247 };
<a name="l00248"></a>00248 } <span class="comment">// namespace r123</span>
<a name="l00249"></a>00249 
<a name="l00250"></a>00250 <span class="preprocessor">#endif</span>
</pre></div></div>
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