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//--- input parameters
input int ma_period=20; // moving average period
 
//--- handle of the indicator used in the EA
int indicator_handle;   
//+------------------------------------------------------------------+
//| Expert initialization function |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- check ma_period validity
   if(ma_period<=0)
     {
      PrintFormat("Invalid ma_period input value: %d",ma_period);
      return (INIT_PARAMETERS_INCORRECT);
     }
//--- during optimization
   if(MQLInfoInteger(MQL_OPTIMIZATION))
     {
      //--- check available RAM for the agent
      int available_memory_mb=TerminalInfoInteger(TERMINAL_MEMORY_TOTAL);
      if(available_memory_mb<2000)
        {
         PrintFormat("Insufficient memory for the test agent: %d MB",
                     available_memory_mb);
         return (INIT_AGENT_NOT_SUITABLE);
        }
     }
//--- check for the indicator
   indicator_handle=iCustom(_Symbol,_Period,"My_Indicator",ma_period);
   if(indicator_handle==INVALID_HANDLE)
     {
      PrintFormat("Failed to generate My_Indicator handle. Error code %d",
                  GetLastError());
      return (INIT_FAILED);
     }
//--- EA initialization successful
   return(INIT_SUCCEEDED);
  }

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