Extract data

#include <iostream>

using namespace std;

class Base
{
public:
  virtual void init() = 0;
};

class Impl : public Base
{
  char m_data[ 2 ];
public:
  virtual void init()
  {
    m_data[ 0 ] = 'c';
    m_data[ 1 ] = 'x';
  }
};

Base* getInstance()
{
  Base* res = new Impl();
  res->init();
  return res;
}

struct Extractor
{
  char data[ 10 ];
};

int main()
{
  Base* b = getInstance();
  Extractor* ext = (Extractor*)( b );
  cout << "1 byte " << ext->data[ sizeof( void* ) +0 ] << endl;
  cout << "2 byte " << ext->data[ sizeof( void* ) +1 ] << endl;
  return 0;
}