Tlist and integers

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assari

(Posted 2006) [#1]

I've always been under the impression that TLists only works with Objects.

If I try to compile this code

mylist:TList=CreateList()

For i=0 To 5
ListAddLast MyList,i
Next

For s=EachIn MyList

Print s

Next

The compiler will complain that it expect an object for the eachin index.

So is it correct for me to make a statement that TList works with objects only. Skidracer (in this post seems to suggest it does work with int). How would you use it w integers correctly?

WendellM

(Posted 2006) [#2]

I think what he may be refering to there is that in non-strict mode, the compiler will let you assign an integer to a list, but it's really a null object:

' Strict

Local myList:TList = CreateList()
' Local myList:Int = CreateList()

Local obj:Object = "Hey, I'm a string!"
Local i:Int

For i = 0 To 5
	ListAddLast myList, i
	ListAddLast myList, obj 
Next

Local c = CountList( myList )
Print "Count = " + c

Local o:Object[] = ListToArray( myList )

For i = 0 To c - 1
	If o[i] = Null Then
		Print i + " = null"
	Else
		Print i + " = " + o[i].ToString()
	EndIf
Next

This code runs fine, but shows that "i" is actually assigned as a null. If you un-comment Strict, you'll need to comment out "ListAddLast myList, i".

Also interesting is that with Strict commented out, you can declare myList as an Int rather than as a TList (swap the commenting in the declarations) and it will still run. However, then element 1 of the converted array shows up as a handle(?!), while the rest appear as strings or nulls.

I'd think that both of these issues are unintentional and it wouldn't surprise me if they were changed(/fixed)in a future update.