Odtnhj

I'm trying to create an Array in MQL4, and on every tick I want to add a new value to array[0] and push the rest of the items back, so the old array[0] becomes array[1] and array[1] becomes array[2] and so on. I want to be able to do this an unlimited number of times, once per tick. Then I can access the value from the previous tick using array[1], but I can also access its current value array[0]. Thanks!

It is possible to have an array of primitives in MQL4, the problem here is that you will have to copy them all each tick which is waste of time and resources. If you want to save some more advanced data (let's say MqlTick), you have to store it as the structure or create a class and save classes. It should be really senseless to copy all objects, that is why you should think of applying CList or CArrayObj and adding objects to the end. Simple magic would help to call element with index 0:

#include <ArraysArrayObj.mqh>
class CTick : public CObject
 public: double m_bid, m_ask;
 CTick(const double bid,const double ask):m_bid(bid),m_ask(ask)
;
CArrayObj *listOfTicks;
CTick *getTickByShift(const int shift=0)
 
 return listOfTicks.At(listOfTicks.Total()-1-shift));
 
int OnInit()
 listOfTicks=new CArrayObj();
 return(1);

void OnTick()
 listOfTicks.Add(new CTick(Bid,Ask));
 //example of accessing ticks 0 and 3, keep in mind you do not have 3 at start!
 double bid0=getTickByShift(0).m_bid;
 double ask3=getTickByShift(3).m_bid;

void OnDeinit(const int reason)delete listOfTicks;

If you need really unlimited number of operations - probably 2^31-1 would be enough for you, to speed up you may think of listOfTicks.Step(1000); to have 1000 empty slots and do not resize(=copy all to the new location) the array every tick.