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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  **********************************************************************/

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