DoubleBits.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2006 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: index/quadtree/DoubleBits.java rev. 1.7 (JTS-1.10)
 *
 **********************************************************************/
 
#ifndef GEOS_IDX_QUADTREE_DOUBLEBITS_H
#define GEOS_IDX_QUADTREE_DOUBLEBITS_H
 
#include <geos/export.h>
#include <geos/platform.h> // for int64
 
#include <string>
 
namespace geos {
namespace index { // geos::index
namespace quadtree { // geos::index::quadtree
 

class GEOS_DLL DoubleBits {
 
public:
 
        static const int EXPONENT_BIAS=1023;
 
        static double powerOf2(int exp);
 
        static int exponent(double d);
 
        static double truncateToPowerOfTwo(double d);
 
        static std::string toBinaryString(double d);
 
        static double maximumCommonMantissa(double d1, double d2);
 
        DoubleBits(double nx);
 
        double getDouble() const;

        int64 biasedExponent() const;

        int getExponent() const;
 
        void zeroLowerBits(int nBits);
 
        int getBit(int i) const;

        int numCommonMantissaBits(const DoubleBits& db) const;

        std::string toString() const;
 
private:
 
        double x;
 
        int64 xBits;
};
 
} // namespace geos::index::quadtree
} // namespace geos::index
} // namespace geos
 
#endif // GEOS_IDX_QUADTREE_DOUBLEBITS_H