Re: Abstract Factory as a holder for different representation

Hi All

I am working on a Stock Exchange related program. Because I want, my
program be independent from specific market convention, I designed a
class hierarchy for market and a class hierarchy for Market Factory.
Market Factory is like Abstract Factory:
// Mrkt.h
struct Mrkt {
public:
   class AbsIndividual {
   public:
     virtual ~AbsIndividual() =0 {}
   };
   virtual ~Mrkt() =0;
};

struct IranMrkt : Mrkt {
   std::string Name;
   struct IndividualBaseInfo : Mrkt::AbsIndividual {
     std::string Nmae;
     std::string FamilyName;
   };

   struct InvestmentCompBaseInfo : Mrkt::AbsIndividual {
     std::string Name;
     std::string ExecutiveMngr;
   };
};

// MrktFactory.h

struct MrktFactory {
public:
   virtual Mrkt::AbsIndividual* MakeIndividual() const =0;
   virtual Mrkt::AbsIndividual* MakeInvestmentComp() const =0;

   virtual ~MrktFactory() { }
};

struct IranMrktFactory : MrktFactory {
   Mrkt::AbsIndividual* MakeIndividual() const {
      return new IranMrkt::IndividualBaseInfo();
   }
   Mrkt::AbsIndividual* MakeInvestmentComp() const {
      return new IranMrkt::InvestmentCompBaseInfo();
   }
};

int main()
{
   auto_ptr<MrktFactory> g_MrktFactory(new IranMrktFactory());
}

Up to here, my program is OK and everything is fine. But there is a
lot ot thing that I want to represent in specific market as a nested
class or object. For example, in IRAN, the market is opened at 9:00 am
and is closed at 12:30 pm. In IRAN, we use Solar system for
representing date and Thursday and Friday are holiday, so I should
have something like this:
struct IranMrkt : Mrkt {
  struct Calendar {
      // Calendar stuff
      class IranianDate {
         // ...
      };
   }
   // ...
};
My problem is: after creating Factory in main and after it is clear
that program bound to IranMrkt, I want to write the following code:
int main()
{
   auto_ptr<MrktFactory> g_MrktFactory(new IranMrktFactory());
   IranMrkt::Calendar Cal;
  // Stock Exchange Bell
  pair<IranMrkt::Calendar::IranianTime,
IranMrkt::Calendar::IranianTime> theBell;
}
I want, it to be plug and play not ad-hoc. I want to retrieve the
class from created factory.
Would you please help me and offer your solution?