Array as parameter, is it possible? | Forex Factory

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Array as parameter, is it possible?

  • #1
  • First Post: Apr 28, 2010 5:08am Apr 28, 2010 5:08am
I'm wondering whether I can put array as parameter for any functions, especially user-defined function.
Let's say
Inserted Code
double xyz(double array1, double array2, int noofbars)
{
for (int i=1, i<noofbars; i++)
   {
   array1[i]=Time[i];
   array2[i]=Volume[i];
   }
then in the code we put
Inserted Code
double abc[],def[];
xyz(abc, def, 10);
i couldn't make it, but i don't know whether it is the problem of parameter input or it's that arrays can't be used as parameters in functions.
Thanks in advance
  • #2
  • Apr 28, 2010 5:47am Apr 28, 2010 5:47am
double xyz(double array1[], double array2[], int noofbars)
  • #3
  • Apr 28, 2010 11:38am Apr 28, 2010 11:38am
Quoting sangmane
double xyz(double array1[], double array2[], int noofbars)

double xyz(double &array1[], double &array2[], int noofbars)

Better to use & in front of parameters, cause the user wants to change them....!?
  • #4
  • Apr 28, 2010 8:11pm Apr 28, 2010 8:11pm
Quoting nightyhawk
double xyz(double &array1[], double &array2[], int noofbars)

Better to use & in front of parameters, cause the user wants to change them....!?
what is the "&" here for?
  • #5
  • Last Post: Apr 29, 2010 3:17am Apr 29, 2010 3:17am
Don't know it for sure - but it must have something to do with "call by value" and "call by reference".

Standard procedure call in MQL is cbv... which means the function
Inserted Code
void doFoo(int a)
only has access to the content (the value) of a... of course you can work with a and even change it, but after returning to the main program a has still his old value.

When using and & (call by reference) in front of parameter name it means, the function has access to the adress of the parameter. So every change is permanent.
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