CommonBits.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2005-2006 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.
 *
 **********************************************************************/
 
#ifndef GEOS_PRECISION_COMMONBITS_H
#define GEOS_PRECISION_COMMONBITS_H
 
#include <geos/export.h>
#include <geos/platform.h> // for int64
 
namespace geos {
namespace precision { // geos.precision

class GEOS_DLL CommonBits {
 
private:
 
        bool isFirst;
 
        int commonMantissaBitsCount;
 
        int64 commonBits;
 
        int64 commonSignExp;
 
public:

        static int64 signExpBits(int64 num);

        static int numCommonMostSigMantissaBits(int64 num1, int64 num2);

        static int64 zeroLowerBits(int64 bits, int nBits);

        static int getBit(int64 bits, int i);
 
        CommonBits();
 
        void add(double num);
 
        double getCommon();
 
};
 
} // namespace geos.precision
} // namespace geos
 
#endif // GEOS_PRECISION_COMMONBITS_H