Method Resize

avida-core/source/tools/cBitArray.cc:26–66

void cRawBitArray::Resize(const int old_bits, const int new_bits)
{
  const int num_old_fields = GetNumFields(old_bits);
  const int num_new_fields = GetNumFields(new_bits);
  if (num_old_fields == num_new_fields) {
    // Clear all bits past the new end and stop.
    unsigned int & last_field = bit_fields[num_new_fields - 1];
    for (int i = new_bits; i < old_bits; i++) {
      const unsigned int clear_bit = i & 31;
      last_field &= ~(1 << clear_bit);
    }
    return;
  }

  // If we made it this far, we have to change the number of fields.
  // Create the new bit array and copy the old one into it.
  unsigned int * new_bit_fields = new unsigned int[ num_new_fields ];
  for (int i = 0; i < num_new_fields && i < num_old_fields; i++) {
    new_bit_fields[i] = bit_fields[i];
  }
  
  // If the old bits are longer, we need to clear the end of the last
  // bit field.
  if (num_old_fields > num_new_fields) {
    unsigned int & last_field = new_bit_fields[num_new_fields - 1];
    for (int clear_bit=GetFieldPos(new_bits); clear_bit < 32; clear_bit++) {
      last_field &= ~(1 << clear_bit);
    }
  }
  
  // If the new bits are longer, clear everything past the end of the old
  // bits.
  for (int i = num_old_fields; i < num_new_fields; i++) {
    new_bit_fields[i] = 0;
  }

  if (bit_fields != NULL) {
    delete [] bit_fields;
  }
  bit_fields = new_bit_fields;
}


void cRawBitArray::ResizeSloppy(const int new_bits)