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Common/vtkLargeInteger.h

00001 /*=========================================================================
00002 
00003   Program:   Visualization Toolkit
00004   Module:    $RCSfile: vtkLargeInteger.h,v $
00005   Language:  C++
00006 
00007   Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen 
00008   All rights reserved.
00009   See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
00010 
00011      This software is distributed WITHOUT ANY WARRANTY; without even 
00012      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00013      PURPOSE.  See the above copyright notice for more information.
00014 
00015 =========================================================================*/
00033 #ifndef __vtkLargeInteger_h
00034 #define __vtkLargeInteger_h
00035 
00036 #include "vtkObject.h"
00037 
00038 class VTK_COMMON_EXPORT vtkLargeInteger 
00039 {
00040 public:
00041   vtkLargeInteger(void);
00042   vtkLargeInteger(long n);
00043   vtkLargeInteger(unsigned long n);
00044   vtkLargeInteger(int n);
00045   vtkLargeInteger(unsigned int n);
00046   vtkLargeInteger(const vtkLargeInteger& n);
00047   ~vtkLargeInteger(void);
00048   
00049   char CastToChar(void) const;
00050   short CastToShort(void) const;
00051   int CastToInt(void) const;
00052   long CastToLong(void) const;
00053   unsigned long CastToUnsignedLong(void) const;
00054   
00055   int IsEven(void) const;
00056   int IsOdd(void) const;
00057   int GetLength(void) const; // in bits
00058   int GetBit(unsigned int p) const; // p'th bit (from zero)
00059   int IsZero() const; // is zero
00060   int GetSign(void) const; // is negative
00061   
00062   void Truncate(unsigned int n); // reduce to lower n bits
00063   void Complement(void); // * -1
00064   
00065   int operator==(const vtkLargeInteger& n) const;
00066   int operator!=(const vtkLargeInteger& n) const;
00067   int operator<(const vtkLargeInteger& n) const;
00068   int operator<=(const vtkLargeInteger& n) const;
00069   int operator>(const vtkLargeInteger& n) const;
00070   int operator>=(const vtkLargeInteger& n) const;
00071   
00072   vtkLargeInteger& operator=(const vtkLargeInteger& n);
00073   vtkLargeInteger& operator+=(const vtkLargeInteger& n);
00074   vtkLargeInteger& operator-=(const vtkLargeInteger& n);
00075   vtkLargeInteger& operator<<=(int n);
00076   vtkLargeInteger& operator>>=(int n);
00077   vtkLargeInteger& operator++(void);
00078   vtkLargeInteger& operator--(void);
00079   vtkLargeInteger  operator++(int);
00080   vtkLargeInteger  operator--(int);
00081   vtkLargeInteger& operator*=(const vtkLargeInteger& n);
00082   vtkLargeInteger& operator/=(const vtkLargeInteger& n);
00083   vtkLargeInteger& operator%=(const vtkLargeInteger& n);
00084   // no change of sign for following operators
00085   vtkLargeInteger& operator&=(const vtkLargeInteger& n);
00086   vtkLargeInteger& operator|=(const vtkLargeInteger& n);
00087   vtkLargeInteger& operator^=(const vtkLargeInteger& n);
00088   
00089   vtkLargeInteger operator+(const vtkLargeInteger& n) const;
00090   vtkLargeInteger operator-(const vtkLargeInteger& n) const;
00091   vtkLargeInteger operator*(const vtkLargeInteger& n) const;
00092   vtkLargeInteger operator/(const vtkLargeInteger& n) const;
00093   vtkLargeInteger operator%(const vtkLargeInteger& n) const;
00094   // no change of sign for following operators
00095   vtkLargeInteger operator&(const vtkLargeInteger& n) const;
00096   vtkLargeInteger operator|(const vtkLargeInteger& n) const;
00097   vtkLargeInteger operator^(const vtkLargeInteger& n) const;
00098   vtkLargeInteger operator<<(int n) const;
00099   vtkLargeInteger operator>>(int n) const;
00100   
00101   friend ostream& operator<<(ostream& s, const vtkLargeInteger& n);
00102   friend istream& operator>>(istream& s, vtkLargeInteger& n);
00103   
00104 private:
00105   char* Number;
00106   int Negative;
00107   unsigned int Sig;
00108   unsigned int Max;
00109   
00110   // unsigned operators
00111   int IsSmaller(const vtkLargeInteger& n) const; // unsigned
00112   int IsGreater(const vtkLargeInteger& n) const; // unsigned
00113   void Expand(unsigned int n); // ensure n'th bit exits
00114   void Contract(); // remove leading 0s
00115   void Plus(const vtkLargeInteger& n); // unsigned
00116   void Minus(const vtkLargeInteger& n); // unsigned
00117 };
00118 
00119 #endif
00120 
00121