Dealing with 3D arrays of lists and run-time error

BlitzMax Forums/BlitzMax Programming/Dealing with 3D arrays of lists and run-time error

DampeS8N

(Posted 2011) [#1]

Anyone know why I might be getting the run-time error:

Unhandled Exception:Attempt to access field or method of Null object

With this code

'at the head of the Type
Field Map:TList[,,]

'In a constructor for the Type
Map = New TList[X+1,Y+1,Z+1]

'In a method for the type
Map[Entity.MapX,Entity.MapY,Entity.MapZ].AddFirst(Entity)

I've simplified this pretty harshly. The constructor is a function that assembles a new object and then returns it. The actual code there, if it matters, is:

Ma.Map = New TList[Ma.X+1,Ma.Y+1,Ma.Z+1]

I'm sure I'm just being a moron.

Also, hello everyone, long time no see.

::EDIT::

OK, so I am a moron. LOL

If Map[Entity.MapX,Entity.MapY,Entity.MapZ]
	Map[Entity.MapX,Entity.MapY,Entity.MapZ].AddLast(Entity)
Else
	Local list:TList = New TList
	list.AddLast(Entity)
	Map[Entity.MapX,Entity.MapY,Entity.MapZ] = list
EndIf

I assumed the lists were already created when the array was created. Silly me.

Last edited 2011

Last edited 2011