unresolved static variable

[Giannos Antoniou]

struct myMqlTradeResult: MqlTradeResult
  {
public:
   bool              isSuccessful;
  };

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class myTransaction
  {
public:
   myMqlTradeResult  result;
   MqlTradeRequest    request;

  };


//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CMyCommand
  {
private:


public:
   static myTransaction lstTransactions[];
   
   static void  CMyCommand::AddTransaction(MqlTradeRequest &_request, myMqlTradeResult &_result)
     {
      myTransaction t;   
      t.request =_request;
      t.result=_result;
      
      ArrayResize(CMyCommand::lstTransactions,ArraySize(CMyCommand::lstTransactions)+1);   //unresolved static variable 'CMyCommand::lstTransactions'   MyCommand.mqh   55      31

      CMyCommand::lstTransactions[ArraySize(CMyCommand::lstTransactions)-1]=t;
     }
 }

I am getting the compilation error:    unresolved static variable 'CMyCommand::lstTransactions'   

Any ideas?

[Roberto Jacobs]

Giannos Antoniou:

I am getting the compilation error:    unresolved static variable 'CMyCommand::lstTransactions'   

Any ideas?

Don't use static variable

[William Roeder]

Perhaps you should read the manual. Especially the first example.
          Language Basics / Object-Oriented Programming / Static Members of a Class - Reference on algorithmic/automated trading language for MetaTrader 5

[Giannos Antoniou]

William Roeder:

Perhaps you should read the manual. Especially the first example.
          Language Basics / Object-Oriented Programming / Static Members of a Class - Reference on algorithmic/automated trading language for MetaTrader 5

I got your point. I should give initial value to the static array.  However, If I do it, how can i resize the array? My goal is to use it as a List<myTransaction> in order to add and remove items.

If this approach is not proper, could you suggest me another approach, please?

[William Roeder]

Giannos Antoniou: I should give initial value to the static array.  However, If I do it, how can i resize the array?

1. How can you give initial values to an array with no size?
2. You already posted code that resizes an array. You already know how.