GEOS
3.6.2
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00001 /********************************************************************** 00002 * 00003 * GEOS - Geometry Engine Open Source 00004 * http://geos.osgeo.org 00005 * 00006 * Copyright (C) 2006 Refractions Research Inc. 00007 * 00008 * This is free software; you can redistribute and/or modify it under 00009 * the terms of the GNU Lesser General Public Licence as published 00010 * by the Free Software Foundation. 00011 * See the COPYING file for more information. 00012 * 00013 ********************************************************************** 00014 * 00015 * Last port: index/quadtree/DoubleBits.java rev. 1.7 (JTS-1.10) 00016 * 00017 **********************************************************************/ 00018 00019 #ifndef GEOS_IDX_QUADTREE_DOUBLEBITS_H 00020 #define GEOS_IDX_QUADTREE_DOUBLEBITS_H 00021 00022 #include <geos/export.h> 00023 #include <geos/platform.h> // for int64 00024 00025 #include <string> 00026 00027 namespace geos { 00028 namespace index { // geos::index 00029 namespace quadtree { // geos::index::quadtree 00030 00031 00044 class GEOS_DLL DoubleBits { 00045 00046 public: 00047 00048 static const int EXPONENT_BIAS=1023; 00049 00050 static double powerOf2(int exp); 00051 00052 static int exponent(double d); 00053 00054 static double truncateToPowerOfTwo(double d); 00055 00056 static std::string toBinaryString(double d); 00057 00058 static double maximumCommonMantissa(double d1, double d2); 00059 00060 DoubleBits(double nx); 00061 00062 double getDouble() const; 00063 00065 int64 biasedExponent() const; 00066 00068 int getExponent() const; 00069 00070 void zeroLowerBits(int nBits); 00071 00072 int getBit(int i) const; 00073 00086 int numCommonMantissaBits(const DoubleBits& db) const; 00087 00089 std::string toString() const; 00090 00091 private: 00092 00093 double x; 00094 00095 int64 xBits; 00096 }; 00097 00098 } // namespace geos::index::quadtree 00099 } // namespace geos::index 00100 } // namespace geos 00101 00102 #endif // GEOS_IDX_QUADTREE_DOUBLEBITS_H