Nested Arrays And Classes

[burt4munger]

Please let me know what I'm doing wrong here.  I want to have the equivalent of a 2d array, but with named dimensions so instead of having parent[3][2] references I would have parent.marklist[3].marks[2], where marklist and marks were their own classes:

 

class  cChecks

   local marks

   

   function init()

      private i

      for (i = 0, i < 10, i++)

         marks = 0

      endfor

   endfunction

   

endclass

 

class cParent

   local marklist

   

   function init()

      private l

      

      for (l = 0, l < 10, l++)

         marklist[l] = new(cChecks)

         marklist[l].init()

      endfor

   endfunction

   

   

endclass

 

 

global Parent = new(cParent)

Parent.init()

 

private i

private j

 

for (i = 0, i < 10, i++)

   for(j=0, j< 10, j++)

      Parent.MarkList.marks[j] = j

   endfor

endfor

 

?Parent.MarkList[3].Marks  produces 9 not {0,1,2,3,4,5,6,7,8,9} as expected.

 

If I manually assign values, like Parent.Marklist[3].Marks[5] = 32 it will work.  It seems like using class references with two or more [] in a line is having a problem.  This also seems to appear calling a class function with an array reference  topclass[x].myfunction(something[index]).

 

This is all with version 5.90 build 2151.

 

What am I doing wrong?

[AzeoTech]

As I've mentioned before somewhere here on the forum related to objects, one of the bugs of DAQFactory OOP, and a reason its not considered a release feature is that you can't have more than one () or [] in a symbol.  So, you can do:

 

topclass[x].memberVariable

 

but you can't do:

 

topclass[x].memberArray[y]

 

because there are two []'s in the full symbol.  Same goes if its a function:

 

topclass[x].memberFunction()

 

The workaround is to simply make a reference to topclass[x] first:

 

private tempOb = topClass[x]

tempOb.memberFunction()

[SteveMyres]

I believe the parser can't currently handle [] and () in the same expression.

[AzeoTech]

Its not the same expression, otherwise you couldn't do:  sin(x) + cos(y), its only in the same symbol.  Now technically, I suppose, most compilers would split topclass[x].memberFunction() into two symbols, but DAQFactory doesn't, which is, actually, the source of the problem and the eventual fix.

[SteveMyres]

Yeah sorry, symbol is the more accurate term.