help with listremove()

BlitzMax Forums/BlitzMax Beginners Area/help with listremove()

Ian Lett

(Posted 2006) [#1]

i have a type called Sprite and a list called spritelist that has a number of sprite types stored in it, i want to remove 1 from the list so i try

listremove (spritelist, bob)

(bob is a sprite in the list as in bob:sprite=a member of the sprite list)

and i cant get it to work

and ideas ?

thanks
Ian

tonyg

(Posted 2006) [#2]

Have you got any code?
What doesn't'work? What errors do you get? Is the list global to Sprite?
There are so many ways to do this.
Here is something that works...

Type sprite
	Global spritelist:TList=CreateList()
	Field x
End Type
bob:Sprite = New sprite
bob.x = 5
ListAddLast(sprite.spritelist , bob)
Print CountList(sprite.spritelist)
ListRemove(sprite.spritelist , bob)
Print CountList(sprite.spritelist)

or a simpler example...

Type sprite
	Field x
End Type
Global spritelist:TList=CreateList()
bob:Sprite = New sprite
bob.x = 5
ListAddLast(spritelist , bob)
Print CountList(spritelist)
ListRemove(spritelist , bob)
Print CountList(spritelist)

Gabriel

(Posted 2006) [#3]

I've got into the habit now of keeping the TLink that is returned when you add an object to a TList. Then you can just call the Remove() method of that TLink.

EG:

Type sprite
   Global List:TList
   Field x:Int,y:Int
   Field Link:TLink
   Method New()
      If List=Null
         List=New TList
      End If
      Link=List.AddLast(Self)
   End Method
   Method Kill()
      Link.Remove()
      Link=Null
   End Method
End Type

bob:Sprite = New sprite
Print CountList(sprite.list)
bob.Kill()
Print CountList(sprite.list)