Method clear_bit

sql/sql_bitmap.h:111–114

    buffer[bit_index(n)] |= bit_mask(n);
  }
  void clear_bit(uint n)
  {
    buffer[bit_index(n)] &= ~bit_mask(n);
  }
  bool is_set(uint n) const
  {
    return buffer[bit_index(n)] & bit_mask(n);