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<hr><h1>radix_sort.h</h1><a href="radix__sort_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 
00007 <font class="comment">/* Copyright, 2001 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025 
00026 <font class="preprocessor">#ifndef NL_RADIX_SORT_H</font>
00027 <font class="preprocessor"></font><font class="preprocessor">#define NL_RADIX_SORT_H</font>
00028 <font class="preprocessor"></font>
00029 <font class="preprocessor">#include "<a class="code" href="types__nl_8h.html">nel/misc/types_nl.h</a>"</font>
00030 <font class="preprocessor">#include "<a class="code" href="common_8h.html">nel/misc/common.h</a>"</font>
00031 
00032 
00033 <font class="keyword">namespace </font>NL3D {
00034 
00035 
00036 <font class="comment">// ***************************************************************************</font>
<a name="l00049"></a><a class="code" href="classNL3D_1_1CRadixSort.html">00049</a> <font class="comment"></font><font class="keyword">template</font>&lt;<font class="keyword">class</font> T&gt; <font class="keyword">class </font>CRadixSort
00050 {
00051 <font class="keyword">public</font>:
00052 
<a name="l00062"></a><a class="code" href="classNL3D_1_1CRadixSort.html#a0">00062</a>         <a class="code" href="classNL3D_1_1CRadixSort.html#a0">CRadixSort</a>(uint keyDepth= 32, uint digitDepth= 8)
00063         {
00064                 <font class="comment">// setup</font>
00065                 <a class="code" href="classNL3D_1_1CRadixSort.html#o0">_KeyDepth</a>= keyDepth;
00066                 <a class="code" href="namespaceNLMISC.html#a215">NLMISC::clamp</a>(<a class="code" href="classNL3D_1_1CRadixSort.html#o0">_KeyDepth</a>, 1U, 32U);
00067                 <a class="code" href="classNL3D_1_1CRadixSort.html#o1">_DigitDepth</a>= digitDepth;
00068                 <a class="code" href="namespaceNLMISC.html#a215">NLMISC::clamp</a>(<a class="code" href="classNL3D_1_1CRadixSort.html#o1">_DigitDepth</a>, 1U, 16U);
00069                 <a class="code" href="classNL3D_1_1CRadixSort.html#o1">_DigitDepth</a>= <a class="code" href="bit__set_8cpp.html#a0">std::min</a>(<a class="code" href="classNL3D_1_1CRadixSort.html#o1">_DigitDepth</a>, <a class="code" href="classNL3D_1_1CRadixSort.html#o0">_KeyDepth</a>);
00070 
00071                 <font class="comment">// resize the array of digits.</font>
00072                 <a class="code" href="classNL3D_1_1CRadixSort.html#o2">_DigitSize</a>= 1&lt;&lt;<a class="code" href="classNL3D_1_1CRadixSort.html#o1">_DigitDepth</a>;
00073                 <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>.resize(<a class="code" href="classNL3D_1_1CRadixSort.html#o2">_DigitSize</a>);
00074         }
00075 
<a name="l00084"></a><a class="code" href="classNL3D_1_1CRadixSort.html#a1">00084</a>         T                               *<a class="code" href="classNL3D_1_1CRadixSort.html#a1">sort</a>(T *array0, T *array1, uint size) {<font class="keywordflow">return</font> <a class="code" href="classNL3D_1_1CRadixSort.html#c0">doSort</a>(array0, array1, size, <font class="keyword">true</font>);}
00085 
00086 
<a name="l00090"></a><a class="code" href="classNL3D_1_1CRadixSort.html#a2">00090</a>         T                               *<a class="code" href="classNL3D_1_1CRadixSort.html#a2">reverse_sort</a>(T *array0, T *array1, uint size) {<font class="keywordflow">return</font> <a class="code" href="classNL3D_1_1CRadixSort.html#c0">doSort</a>(array0, array1, size, <font class="keyword">false</font>);}
00091 
00092 
00093 <font class="comment">// ***********************</font>
00094 <font class="keyword">private</font>:
00095 
<a name="l00096"></a><a class="code" href="structNL3D_1_1CRadixSort_1_1CSortDigit.html">00096</a>         <font class="keyword">struct  </font>CSortDigit
00097         {
00098                 <font class="comment">// For a digit, how many elements it has in the array.</font>
<a name="l00099"></a><a class="code" href="structNL3D_1_1CRadixSort_1_1CSortDigit.html#m0">00099</a>                 uint    <a class="code" href="structNL3D_1_1CRadixSort_1_1CSortDigit.html#m0">Count</a>;
00100                 <font class="comment">// current ptr where to write in destArray</font>
<a name="l00101"></a><a class="code" href="structNL3D_1_1CRadixSort_1_1CSortDigit.html#m1">00101</a>                 T               *<a class="code" href="structNL3D_1_1CRadixSort_1_1CSortDigit.html#m1">Ptr</a>;
00102         };
00103 
00104         <font class="comment">// setup</font>
<a name="l00105"></a><a class="code" href="classNL3D_1_1CRadixSort.html#o0">00105</a>         uint                    <a class="code" href="classNL3D_1_1CRadixSort.html#o0">_KeyDepth</a>;
<a name="l00106"></a><a class="code" href="classNL3D_1_1CRadixSort.html#o1">00106</a>         uint                    <a class="code" href="classNL3D_1_1CRadixSort.html#o1">_DigitDepth</a>;
<a name="l00107"></a><a class="code" href="classNL3D_1_1CRadixSort.html#o2">00107</a>         uint                    <a class="code" href="classNL3D_1_1CRadixSort.html#o2">_DigitSize</a>;
00108         <font class="comment">// We sort digits per digit (default is byte per byte)</font>
<a name="l00109"></a><a class="code" href="classNL3D_1_1CRadixSort.html#o3">00109</a>         std::vector&lt;CSortDigit&gt;         <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>;
00110 
00111 
<a name="l00113"></a><a class="code" href="classNL3D_1_1CRadixSort.html#c0">00113</a>         T                               *<a class="code" href="classNL3D_1_1CRadixSort.html#c0">doSort</a>(T *arraySrc, T *arrayDst, uint size, <font class="keywordtype">bool</font> increasingOrder)
00114         {
00115                 <font class="keywordflow">if</font>(size==0)
00116                         <font class="keywordflow">return</font> arraySrc;
00117 
00118                 <font class="comment">// for all digits.</font>
00119                 <font class="keywordflow">for</font>(uint        digit=0; digit&lt; <a class="code" href="classNL3D_1_1CRadixSort.html#o0">_KeyDepth</a>; digit+=<a class="code" href="classNL3D_1_1CRadixSort.html#o1">_DigitDepth</a> )
00120                 {
00121                         sint    i;
00122                         <font class="comment">// how many bits do we shift?</font>
00123                         uint    digitShift= digit;
00124                         uint    digitMask= <a class="code" href="classNL3D_1_1CRadixSort.html#o2">_DigitSize</a> - 1;
00125 
00126                         <font class="comment">// Init digit count.</font>
00127                         <font class="keywordflow">for</font>(i=0; i&lt;(sint)<a class="code" href="classNL3D_1_1CRadixSort.html#o2">_DigitSize</a>; i++)
00128                         {
00129                                 <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>[i].Count= 0;
00130                         }
00131 
00132                         <font class="comment">// for all elements in array, count the usage of current digit.</font>
00133                         T       *srcPtr= arraySrc;
00134                         <font class="keywordflow">for</font>(i=0; i&lt;(sint)size; i++, srcPtr++)
00135                         {
00136                                 <font class="comment">// get the key for this element</font>
00137                                 uint32  key= srcPtr-&gt;getRadixKey();
00138                                 <font class="comment">// get the actual digit of interest</font>
00139                                 key&gt;&gt;= digitShift;
00140                                 key&amp;= digitMask;
00141                                 <font class="comment">// increment the use of this digit.</font>
00142                                 <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>[key].Count++;
00143                         }
00144 
00145                         <font class="comment">// for all digit, init start Ptr.</font>
00146                         T       *dstPtr= arrayDst;
00147                         <font class="keywordflow">if</font>(increasingOrder)
00148                         {
00149                                 <font class="keywordflow">for</font>(i=0; i&lt;(sint)<a class="code" href="classNL3D_1_1CRadixSort.html#o2">_DigitSize</a>; i++)
00150                                 {
00151                                         <font class="comment">// setup the dest ptr for this digit.</font>
00152                                         <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>[i].Ptr= dstPtr;
00153                                         <font class="comment">// increment the ptr of digit usage</font>
00154                                         dstPtr+= <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>[i].Count;
00155                                 }
00156                         }
00157                         <font class="keywordflow">else</font>
00158                         {
00159                                 <font class="comment">// reverse order of copy for digits, so the biggest one will </font>
00160                                 <font class="comment">// copy in the beginning of the array</font>
00161                                 <font class="keywordflow">for</font>(i=<a class="code" href="classNL3D_1_1CRadixSort.html#o2">_DigitSize</a>-1; i&gt;=0; i--)
00162                                 {
00163                                         <font class="comment">// setup the dest ptr for this digit.</font>
00164                                         <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>[i].Ptr= dstPtr;
00165                                         <font class="comment">// increment the ptr of digit usage</font>
00166                                         dstPtr+= <a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>[i].Count;
00167                                 }
00168                         }
00169 
00170                         <font class="comment">// for all elements, sort for this digit, by copying from src to dest.</font>
00171                         srcPtr= arraySrc;
00172                         <font class="keywordflow">for</font>(i=0; i&lt;(sint)size; i++, srcPtr++)
00173                         {
00174                                 <font class="comment">// get the key for this element</font>
00175                                 uint32  key= srcPtr-&gt;getRadixKey();
00176                                 <font class="comment">// get the actual digit of interest</font>
00177                                 key&gt;&gt;= digitShift;
00178                                 key&amp;= digitMask;
00179                                 <font class="comment">// copy to good digit dst, and increment dest ptr.</font>
00180                                 *(<a class="code" href="classNL3D_1_1CRadixSort.html#o3">_SortDigits</a>[key].Ptr++)= *srcPtr;
00181                         }
00182 
00183                         <font class="comment">// arraDst has now values of arraySrc sorted for the current digit.</font>
00184                         <font class="comment">// now, restart with next digit, so swap src / dst</font>
00185                         std::swap(arraySrc, arrayDst);
00186                 }
00187 
00188                 <font class="comment">// return the array correctly sorted. because of last swap, this is arraySrc</font>
00189                 <font class="keywordflow">return</font> arraySrc;
00190         }
00191 
00192 };
00193 
00194 
00195 } <font class="comment">// NL3D</font>
00196 
00197 
00198 <font class="preprocessor">#endif // NL_RADIX_SORT_H</font>
00199 <font class="preprocessor"></font>
00200 <font class="comment">/* End of radix_sort.h */</font>
</pre></div>

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