template functions overloading is not supported yet in MQL4

Hm, I just copied this code from the help and it compiled without problem:

template<typename T>
T ArrayMax(T &arr[])
  {
   uint size=ArraySize(arr);
   if(size==0) return(0);          
   
   T max=arr[0];
   for(uint n=1;n<size;n++)
      if(max<arr[n]) max=arr[n];
//---
   return(max);
  }

Mt4, build 646, MetaEditor v.934

I did not run that code though. 

Add "&" in front of "arr[]" in the function specification. Arrays can be passed by reference only. Maybe that is the reason for compiler error.