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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><<font class="keyword">class</font> T> <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<<<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<CSortDigit> <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< <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<(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<(sint)size; i++, srcPtr++)
00135 {
00136 <font class="comment">// get the key for this element</font>
00137 uint32 key= srcPtr->getRadixKey();
00138 <font class="comment">// get the actual digit of interest</font>
00139 key>>= digitShift;
00140 key&= 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<(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>=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<(sint)size; i++, srcPtr++)
00173 {
00174 <font class="comment">// get the key for this element</font>
00175 uint32 key= srcPtr->getRadixKey();
00176 <font class="comment">// get the actual digit of interest</font>
00177 key>>= digitShift;
00178 key&= 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>
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