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<h1>DoubleBits.h</h1>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**********************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> * $Id: DoubleBits.h 2556 2009-06-06 22:22:28Z strk $</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * GEOS - Geometry Engine Open Source</span>
<a name="l00005"></a>00005 <span class="comment"> * http://geos.refractions.net</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Copyright (C) 2006 Refractions Research Inc.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * This is free software; you can redistribute and/or modify it under</span>
<a name="l00010"></a>00010 <span class="comment"> * the terms of the GNU Lesser General Public Licence as published</span>
<a name="l00011"></a>00011 <span class="comment"> * by the Free Software Foundation. </span>
<a name="l00012"></a>00012 <span class="comment"> * See the COPYING file for more information.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> **********************************************************************</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * Last port: index/quadtree/DoubleBits.java rev. 1.7 (JTS-1.10)</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> **********************************************************************/</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="preprocessor">#ifndef GEOS_IDX_QUADTREE_DOUBLEBITS_H</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define GEOS_IDX_QUADTREE_DOUBLEBITS_H</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include &lt;geos/export.h&gt;</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;geos/platform.h&gt;</span> <span class="comment">// for int64</span>
<a name="l00025"></a>00025 
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;string&gt;</span>
<a name="l00027"></a>00027 
<a name="l00028"></a>00028 <span class="keyword">namespace </span>geos {
<a name="l00029"></a>00029 <span class="keyword">namespace </span>index { <span class="comment">// geos::index</span>
<a name="l00030"></a><a class="code" href="namespacegeos_1_1index_1_1quadtree.html">00030</a> <span class="keyword">namespace </span>quadtree { <span class="comment">// geos::index::quadtree</span>
<a name="l00031"></a>00031 
<a name="l00032"></a>00032 
<a name="l00045"></a><a class="code" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html">00045</a> <span class="keyword">class </span>GEOS_DLL <a class="code" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html" title="DoubleBits manipulates Double numbers by using bit manipulation and bit-field extraction.">DoubleBits</a> {
<a name="l00046"></a>00046 
<a name="l00047"></a>00047 <span class="keyword">public</span>:
<a name="l00048"></a>00048 
<a name="l00049"></a>00049         <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> EXPONENT_BIAS=1023;
<a name="l00050"></a>00050 
<a name="l00051"></a>00051         <span class="keyword">static</span> <span class="keywordtype">double</span> powerOf2(<span class="keywordtype">int</span> exp);
<a name="l00052"></a>00052 
<a name="l00053"></a>00053         <span class="keyword">static</span> <span class="keywordtype">int</span> exponent(<span class="keywordtype">double</span> d);
<a name="l00054"></a>00054 
<a name="l00055"></a>00055         <span class="keyword">static</span> <span class="keywordtype">double</span> truncateToPowerOfTwo(<span class="keywordtype">double</span> d);
<a name="l00056"></a>00056 
<a name="l00057"></a>00057         <span class="keyword">static</span> std::string toBinaryString(<span class="keywordtype">double</span> d);
<a name="l00058"></a>00058 
<a name="l00059"></a>00059         <span class="keyword">static</span> <span class="keywordtype">double</span> maximumCommonMantissa(<span class="keywordtype">double</span> d1, <span class="keywordtype">double</span> d2);
<a name="l00060"></a>00060 
<a name="l00061"></a>00061         <a class="code" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html" title="DoubleBits manipulates Double numbers by using bit manipulation and bit-field extraction.">DoubleBits</a>(<span class="keywordtype">double</span> nx);
<a name="l00062"></a>00062 
<a name="l00063"></a>00063         <span class="keywordtype">double</span> getDouble() <span class="keyword">const</span>;
<a name="l00064"></a>00064 
<a name="l00066"></a>00066         int64 biasedExponent() <span class="keyword">const</span>;
<a name="l00067"></a>00067 
<a name="l00069"></a>00069         <span class="keywordtype">int</span> getExponent() <span class="keyword">const</span>;
<a name="l00070"></a>00070 
<a name="l00071"></a>00071         <span class="keywordtype">void</span> zeroLowerBits(<span class="keywordtype">int</span> nBits);
<a name="l00072"></a>00072 
<a name="l00073"></a>00073         <span class="keywordtype">int</span> getBit(<span class="keywordtype">int</span> i) <span class="keyword">const</span>;
<a name="l00074"></a>00074 
<a name="l00087"></a>00087         <span class="keywordtype">int</span> numCommonMantissaBits(<span class="keyword">const</span> <a class="code" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html" title="DoubleBits manipulates Double numbers by using bit manipulation and bit-field extraction.">DoubleBits</a>&amp; db) <span class="keyword">const</span>;
<a name="l00088"></a>00088 
<a name="l00090"></a>00090         std::string toString() <span class="keyword">const</span>;
<a name="l00091"></a>00091 
<a name="l00092"></a>00092 <span class="keyword">private</span>:
<a name="l00093"></a>00093 
<a name="l00094"></a>00094         <span class="keywordtype">double</span> x;
<a name="l00095"></a>00095 
<a name="l00096"></a>00096         int64 xBits;
<a name="l00097"></a>00097 };
<a name="l00098"></a>00098 
<a name="l00099"></a>00099 } <span class="comment">// namespace geos::index::quadtree</span>
<a name="l00100"></a>00100 } <span class="comment">// namespace geos::index</span>
<a name="l00101"></a>00101 } <span class="comment">// namespace geos</span>
<a name="l00102"></a>00102 
<a name="l00103"></a>00103 <span class="preprocessor">#endif // GEOS_IDX_QUADTREE_DOUBLEBITS_H</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span>
<a name="l00105"></a>00105 <span class="comment">/**********************************************************************</span>
<a name="l00106"></a>00106 <span class="comment"> * $Log$</span>
<a name="l00107"></a>00107 <span class="comment"> * Revision 1.2  2006/05/23 14:29:33  strk</span>
<a name="l00108"></a>00108 <span class="comment"> * * source/headers/geos/index/quadtree/DoubleBits.h, source/index/quadtree/DoubleBits.cpp: const correctness and documentation.</span>
<a name="l00109"></a>00109 <span class="comment"> *</span>
<a name="l00110"></a>00110 <span class="comment"> * Revision 1.1  2006/03/22 12:22:50  strk</span>
<a name="l00111"></a>00111 <span class="comment"> * indexQuadtree.h split</span>
<a name="l00112"></a>00112 <span class="comment"> *</span>
<a name="l00113"></a>00113 <span class="comment"> **********************************************************************/</span>
<a name="l00114"></a>00114 
</pre></div></div>
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