No Shift Option => Changing MQL4 to MQL5.

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MQL4 : 

double  iATR(
   string       symbol,     // symbol
   int          timeframe,  // timeframe
   int          period,     // averaging period
   int          shift       // shift
   );

MQL5 : 

int  iATR(
   string           symbol,        // symbol name
   ENUM_TIMEFRAMES  period,        // period
   int              ma_period      // averaging period 
   );


1. Same issue for other Indicators too. How to use Shift in MQL5? 

2. In MQL4 it return double value but in MQL5 it return int value?


How to use Shift in MQL5?

 
int ATRHandle; 
 ATRHandle = iATR(Symbol(), PERIOD_CURRENT, 5);

double ATRBuffer[];

OnTick or Any where (){

ArrayResize(ATRBuffer, AnySize);
Then
CopyBuffer(ATRHandle, 0, buffer number 
0,
42, Amount Needed
ATRBuffer);

ArraySetAsSeries(ATRBuffer, true) Enables You Index backwards like in MT4.
double ATRValue = ATRBuffer[shift]; your value 

}
}
Copy Buffers. 


MetaQuotes switched to Buffers to make things faster.
Unit once copy anytime.


 

Of course it doesn't have shift.

Perhaps you should read the manual, especially the examples.
   How To Ask Questions The Smart Way. (2004)
      How To Interpret Answers.
         RTFM and STFW: How To Tell You've Seriously Screwed Up.

They all (including iCustom) return a handle (an int). You get that in OnInit. In OnTick/OnCalculate/OnStart (after the indicator has updated its buffers), you use the handle, shift and count to get the data.
          Technical Indicators - Reference on algorithmic/automated trading language for MetaTrader 5
          Timeseries and Indicators Access / CopyBuffer - Reference on algorithmic/automated trading language for MetaTrader 5
          How to start with MQL5 - General - MQL5 programming forum - Page 3 #22 (2020)
          How to start with MQL5 - MetaTrader 5 - General - MQL5 programming forum - Page 7 #61 (2020)
          MQL5 for Newbies: Guide to Using Technical Indicators in Expert Advisors - MQL5 Articles (2010)
          How to call indicators in MQL5 - MQL5 Articles (2010)

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