Dynamically allocated - jagged object arrays

//+------------------------------------------------------------------+
//|                             TwoDimensionalObjectArrayExample.mq5 |
//|                                                      nicholishen |
//|                                   www.reddit.com/u/nicholishenFX |
//+------------------------------------------------------------------+
#property copyright "nicholishen"
#property link      "www.reddit.com/u/nicholishenFX"
#property version   "1.00"
#include <Arrays\ArrayObj.mqh>
#define  SORT_ASCENDING  0
#define  SORT_DESCENDING 1
//+------------------------------------------------------------------+
//|     Example Object                                               |
//+------------------------------------------------------------------+
class CSymbol : public CObject
{
private:
   string            m_symbol;
public:
                     CSymbol(const string symbol):m_symbol(symbol){}
   string            Symbol()    const { return m_symbol;                              }
   double            Ask()       const { return SymbolInfoDouble(m_symbol,SYMBOL_ASK); }
   double            Bid()       const { return SymbolInfoDouble(m_symbol,SYMBOL_BID); }    
      //--- Override the Compare method of CObject. It must have the same signature!
      int            Compare(const CObject *node,const int mode=0) const override;      
};
int CSymbol::Compare(const CObject *node,const int mode=0) const override // This is the overridden compare method called by QuickSort()
{
   //CSymbol *nodeCast = (CSymbol*)node; // Casting CObject pointer to pointer of this class can make code easier to read
   int compare = StringCompare(this.Symbol(),((CSymbol*)node).Symbol());         // Comparing string value for alphabetical sort
   return mode == SORT_ASCENDING ? compare : compare == 0 ? compare : compare == 1 ? -1 : 1;
}
//+------------------------------------------------------------------+
//|      Example Group of Objects                                    |
//+------------------------------------------------------------------+
class CSymbolGroup : public CArrayObj // Inherits CArrayObj
{
public:
   //--- Add Symbol objects to dynamic array and sorts the array alphabetically
   void              Add(const string symbol)   { this.Add(new CSymbol(symbol)); this.Sort(SORT_ASCENDING);}
   //--- This method allows you to use [] like in a normal array
   //--- Return type needs to be the name of the class stored in array
   CSymbol          *operator[](const int index) const { return((CSymbol*)At(index));  }
};
//+------------------------------------------------------------------+
//|       Example Array of Groups of Objects                         |
//+------------------------------------------------------------------+
class CSymbolMaster : public CArrayObj
{
public:            
   CSymbolGroup     *operator[](const int index) const { return((CSymbolGroup*)At(index)); }
};
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
{
   CSymbolMaster Master;
   CSymbolGroup  *group;
   //--- Group 1
   group = new CSymbolGroup;
   group.Add("EURUSD");
   group.Add("USDJPY");
   group.Add("EURGBP");
   Master.Add(group);
   //--- Group 2
   group = new CSymbolGroup;
   group.Add("EURJPY");
   group.Add("GBPJPY");
   group.Add("CADCHF");
   group.Add("CHFJPY");
   group.Add("AUDNZD");
   group.Add("CADJPY");
   group.Add("EURAUD");
   Master.Add(group);
   //--- for each element in master
   for(int i = 0; i < Master.Total();i++)
   {
      Print("Group ",i+1," has (",Master[i].Total(),") members");
      //--- for each element in symbols group
      for(int j = 0; j < Master[i].Total();j++)
      {
         Print(Master[i][j].Symbol()         ,
               " Bid = ",Master[i][j].Bid()  ,
               " | Ask = ",Master[i][j].Ask()
               );
      }
   }  
}
//+------------------------------------------------------------------+
/*----------OUTPUT------------------
Group 1 has (3) members
EURGBP Bid = 0.85112 | Ask = 0.85119
EURUSD Bid = 1.06431 | Ask = 1.06438
USDJPY Bid = 113.499 | Ask = 113.506
Group 2 has (7) members
AUDNZD Bid = 1.06696 | Ask = 1.06714
CADCHF Bid = 0.76815 | Ask = 0.76833
CADJPY Bid = 87.16   | Ask = 87.178
CHFJPY Bid = 113.458 | Ask = 113.474
EURAUD Bid = 1.37971 | Ask = 1.37996
EURJPY Bid = 120.799 | Ask = 120.809
GBPJPY Bid = 141.923 | Ask = 141.94
*/