// To register a component, place on global scope
#define REGISTER_CREATOR( NAME ) \
  Component *NAME##Create( void )\
  {                              \
    return new NAME( );          \
  }                              \
  NAME##Creator( #NAME, NAME##Create )

struct Creator
{
  Creator( const char *name, Component *(*fn)( void ) )
    : Create( fn )
  {
    // Assume FACTORY is a global singleton or pointer
    FACTORY->Register( name, this );
  }

  Component *(*Create)( void );
}

class Factory
{
public:
  Component *CreateComponent( const std::string& name );
  void Register( const char *name, Creator creator );

private:
  std::map<std::string, Creator *> m_map;
};

Component *Factory::CreateComponent( const std::string& name )
{
  return m_map[name]->Create( );
}

void Factory::Register( const char *name, Creator creator )
{
  m_map[std::string( name )] = creator;
}