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# CommonBits.h

    00001 /**********************************************************************
    00002  * $Id: CommonBits.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) 2005-2006 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 #ifndef GEOS_PRECISION_COMMONBITS_H
    00017 #define GEOS_PRECISION_COMMONBITS_H
    00018
    00019 #include <geos/export.h>
    00020 #include <geos/platform.h> // for int64
    00021
    00022 namespace geos {
    00023 namespace precision { // geos.precision
    00024
    00034 class GEOS_DLL CommonBits {
    00035
    00036 private:
    00037
    00038         bool isFirst;
    00039
    00040         int commonMantissaBitsCount;
    00041
    00042         int64 commonBits;
    00043
    00044         int64 commonSignExp;
    00045
    00046 public:
    00047
    00055         static int64 signExpBits(int64 num);
    00056
    00068         static int numCommonMostSigMantissaBits(int64 num1, int64 num2);
    00069
    00077         static int64 zeroLowerBits(int64 bits, int nBits);
    00078
    00086         static int getBit(int64 bits, int i);
    00087
    00088         CommonBits();
    00089
    00090         void add(double num);
    00091
    00092         double getCommon();
    00093
    00094 };
    00095
    00096 } // namespace geos.precision
    00097 } // namespace geos
    00098
    00099 #endif // GEOS_PRECISION_COMMONBITS_H
    00100
    00101 /**********************************************************************
    00102  * $Log$
    00103  * Revision 1.1  2006/03/23 09:17:19  strk
    00104  * precision.h header split, minor optimizations
    00105  *
    00106  **********************************************************************/