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Tiny Help with TLists

BlitzMax Forums/BlitzMax Beginners Area/Tiny Help with TLists

Chroma(Posted 2006) [#1]
I have a main TList that has all my objects in it. Then I have a second TList that I'm using to also track the same objects that are in a certain state.

The problem is how do I get a specific object in a list so I can alter it's properties? I see the MyList.Last command but I'm not sure how I can actually get the last item. If I do a f:MyObject = MyList.Last it doesn't work. So basically the question is what is the correct syntax for getting an object from the list so I can change it's properties.

Any help is appreciated.


H&K(Posted 2006) [#2]
You have to cast the object back to you MyObject, (I think), so I would guess
f:MyObject = MyObject (MyList.Last)
Im just guessing, so wait until the big boys answer, or just test it I suppose


Dreamora(Posted 2006) [#3]
f:MyObject = MyObject(MyList.Last() ) (or .first() )

first() and last() are methods, not fields.
Blitz methods and functions that return something need to have () to return something. (you can call them without the () if they do not return anything without any problem)


Amon(Posted 2006) [#4]
What i do is have a seperate field in my type called "id". I assign an id to an object then when i need to manipulate the object I check if the id matches and make the necessary changes.


H&K(Posted 2006) [#5]
hay that means I was nearly right. ;) ;) ;)


Chroma(Posted 2006) [#6]
Ok now what if I have the object in the 2nd list and i change a value. Will the same object in the first list be effected?


tonyg(Posted 2006) [#7]
Yes. The entry in the both lists is simply a pointer to the same single object.
Type ttest
	Field x
End Type
temp:ttest = New ttest
temp.x = 5
list1:TList = CreateList()
list2:TList = CreateList()
ListAddLast list1 , temp
ListAddLast list2 , temp
newtemp:TTest = ttest(list2.last() )
newtemp.x = 10
For all1:ttest = EachIn list1
	Print "Value in list1 : " +  all1.x
Next
For all2:ttest = EachIn list2
	Print "Value in list2 : " + all2.x
Next



Chroma(Posted 2006) [#8]
Excellent! Now how can I use the object from one list to target the same object in the other list?


H&K(Posted 2006) [#9]
You just point the link to the same object


Chroma(Posted 2006) [#10]
Not using Links but I found a workaround. Thanks for the help all. =)