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DoubleBits.h

00001 /**********************************************************************
00002  * $Id: DoubleBits.h 2556 2009-06-06 22:22:28Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2006 Refractions Research Inc.
00008  *
00009  * This is free software; you can redistribute and/or modify it under
00010  * the terms of the GNU Lesser General Public Licence as published
00011  * by the Free Software Foundation. 
00012  * See the COPYING file for more information.
00013  *
00014  **********************************************************************
00015  *
00016  * Last port: index/quadtree/DoubleBits.java rev. 1.7 (JTS-1.10)
00017  *
00018  **********************************************************************/
00019 
00020 #ifndef GEOS_IDX_QUADTREE_DOUBLEBITS_H
00021 #define GEOS_IDX_QUADTREE_DOUBLEBITS_H
00022 
00023 #include <geos/export.h>
00024 #include <geos/platform.h> // for int64
00025 
00026 #include <string>
00027 
00028 namespace geos {
00029 namespace index { // geos::index
00030 namespace quadtree { // geos::index::quadtree
00031 
00032 
00045 class GEOS_DLL DoubleBits {
00046 
00047 public:
00048 
00049         static const int EXPONENT_BIAS=1023;
00050 
00051         static double powerOf2(int exp);
00052 
00053         static int exponent(double d);
00054 
00055         static double truncateToPowerOfTwo(double d);
00056 
00057         static std::string toBinaryString(double d);
00058 
00059         static double maximumCommonMantissa(double d1, double d2);
00060 
00061         DoubleBits(double nx);
00062 
00063         double getDouble() const;
00064 
00066         int64 biasedExponent() const;
00067 
00069         int getExponent() const;
00070 
00071         void zeroLowerBits(int nBits);
00072 
00073         int getBit(int i) const;
00074 
00087         int numCommonMantissaBits(const DoubleBits& db) const;
00088 
00090         std::string toString() const;
00091 
00092 private:
00093 
00094         double x;
00095 
00096         int64 xBits;
00097 };
00098 
00099 } // namespace geos::index::quadtree
00100 } // namespace geos::index
00101 } // namespace geos
00102 
00103 #endif // GEOS_IDX_QUADTREE_DOUBLEBITS_H
00104 
00105 /**********************************************************************
00106  * $Log$
00107  * Revision 1.2  2006/05/23 14:29:33  strk
00108  * * source/headers/geos/index/quadtree/DoubleBits.h, source/index/quadtree/DoubleBits.cpp: const correctness and documentation.
00109  *
00110  * Revision 1.1  2006/03/22 12:22:50  strk
00111  * indexQuadtree.h split
00112  *
00113  **********************************************************************/
00114 

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