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CommonBits.h
1 /**********************************************************************
2 * $Id: CommonBits.h 2556 2009-06-06 22:22:28Z strk $
3 *
4 * GEOS - Geometry Engine Open Source
5 * http://geos.refractions.net
6 *
7 * Copyright (C) 2005-2006 Refractions Research Inc.
8 *
9 * This is free software; you can redistribute and/or modify it under
10 * the terms of the GNU Lesser General Public Licence as published
11 * by the Free Software Foundation.
12 * See the COPYING file for more information.
13 *
14 **********************************************************************/
15
16 #ifndef GEOS_PRECISION_COMMONBITS_H
17 #define GEOS_PRECISION_COMMONBITS_H
18
19 #include <geos/export.h>
20 #include <geos/platform.h> // for int64
21
22 namespace geos {
23 namespace precision { // geos.precision
24
34 class GEOS_DLL CommonBits {
35
36 private:
37
38 bool isFirst;
39
40 int commonMantissaBitsCount;
41
42 int64 commonBits;
43
44 int64 commonSignExp;
45
46 public:
47
55 static int64 signExpBits(int64 num);
56
68 static int numCommonMostSigMantissaBits(int64 num1, int64 num2);
69
77 static int64 zeroLowerBits(int64 bits, int nBits);
78
86 static int getBit(int64 bits, int i);
87
88 CommonBits();
89
90 void add(double num);
91
92 double getCommon();
93
94 };
95
96 } // namespace geos.precision
97 } // namespace geos
98
99 #endif // GEOS_PRECISION_COMMONBITS_H
100
101 /**********************************************************************
102 * $Log$
103 * Revision 1.1 2006/03/23 09:17:19 strk
104 * precision.h header split, minor optimizations
105 *
106 **********************************************************************/