include/Geant4/G4SurfBits.icc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
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0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
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0024 // ********************************************************************
0025 //
0026 // Implementation of inline methods of G4SurfBits
0027 // --------------------------------------------------------------------
0028
0029 inline void G4SurfBits::SetBitNumber(unsigned int bitnumber, G4bool value)
0030 {
0031   // set bit number 'bitnumber' to be value
0032
0033   if (bitnumber >= fNBits)
0034   {
0035     unsigned int new_size = (bitnumber/8) + 1;
0036     if (new_size > fNBytes)
0037     {
0038       if (new_size < 100 * 1024 * 1024) { new_size *= 2; }
0039       unsigned char *old_location = fAllBits;
0040       fAllBits = new unsigned char[new_size];
0041       std::memcpy(fAllBits,old_location,fNBytes);
0042       std::memset(fAllBits+fNBytes ,0, new_size-fNBytes);
0043       fNBytes = new_size;
0044       delete [] old_location;
0045     }
0046     fNBits = bitnumber+1;
0047   }
0048   unsigned int loc = bitnumber/8;
0049   unsigned char bit = bitnumber%8;
0050   if (value)
0051   {
0052     fAllBits[loc] |= (1<<bit);
0053   }
0054   else
0055   {
0056     fAllBits[loc] &= (0xFF ^ (1<<bit));
0057   }
0058 }
0059
0060 inline G4bool G4SurfBits::TestBitNumber(unsigned int bitnumber) const
0061 {
0062   // Return the current value of the bit
0063
0064   if (bitnumber >= fNBits) { return false; }
0065   unsigned int loc = bitnumber/8;
0066   unsigned char value = fAllBits[loc];
0067   unsigned char bit = bitnumber%8;
0068   G4bool result = (value & (1<<bit)) != 0;
0069   return result;
0070   // short: return 0 != (fAllBits[bitnumber/8] & (1<< (bitnumber%8)));
0071 }
0072
0073 inline void G4SurfBits::ResetBitNumber(unsigned int bitnumber)
0074 {
0075   SetBitNumber(bitnumber,false);
0076 }
0077
0078 inline G4bool G4SurfBits::operator[](unsigned int bitnumber) const
0079 {
0080   return TestBitNumber(bitnumber);
0081 }