CommonBits.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://geos.osgeo.org
00005  *
00006  * Copyright (C) 2005-2006 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 #ifndef GEOS_PRECISION_COMMONBITS_H
00016 #define GEOS_PRECISION_COMMONBITS_H
00017 
00018 #include <geos/export.h>
00019 #include <geos/platform.h> // for int64
00020 
00021 namespace geos {
00022 namespace precision { // geos.precision
00023 
00033 class GEOS_DLL CommonBits {
00034 
00035 private:
00036 
00037         bool isFirst;
00038 
00039         int commonMantissaBitsCount;
00040 
00041         int64 commonBits;
00042 
00043         int64 commonSignExp;
00044 
00045 public:
00046 
00054         static int64 signExpBits(int64 num);
00055 
00067         static int numCommonMostSigMantissaBits(int64 num1, int64 num2);
00068 
00076         static int64 zeroLowerBits(int64 bits, int nBits);
00077 
00085         static int getBit(int64 bits, int i);
00086 
00087         CommonBits();
00088 
00089         void add(double num);
00090 
00091         double getCommon();
00092 
00093 };
00094 
00095 } // namespace geos.precision
00096 } // namespace geos
00097 
00098 #endif // GEOS_PRECISION_COMMONBITS_H

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