what are Tlists/Tlinks?
BlitzMax Forums/BlitzMax Beginners Area/what are Tlists/Tlinks?
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| I give up. So what are they? Where can I find a clear explanation of them? Bleh. |
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| tlists are lists of all of the types you put in them with list.addlast(temp:mytype) so when you say For m:mytype = EachIn mylist Next it will iterate through every type you put in that list |
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| Basically TList is a linked list - a chain of joined-together links. Each link contains an object which you store within it. So it lets you chain together lots of objects. You can add and remove links in the chain easily and the gap left will be closed. Search for linked lists on wikipedia. |
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| Ok, I think I get Tlist now. So you could have several different objects in the same list? What about Tlink? |
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| So you could have several different objects in the same list? Yes What about Tlink? TLINK is the 'link' to a determinated object into the list. Generally you dont' know what position a determinated object has in the list. With its LINK you can get it immediately. So you can REMOVE it, get its VALUE or move to the prev or next item-link in the list. When you add an object to a list a best practice is to store in a field the link. Stupidest example in the world Type myobject Field value:Int Field link:TLink End Type Local mylist:TList=New TList Local ob:myobject For k=1 To 100 ob=New myobject ob.value=k ob.link=mylist.addlast(ob) Next |
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| I'm thankful for stupid examples. |
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| How do you update the current object? I have a list of strings in a tlist and a tlink pointing to the current one, how do I change the string pointed to by tlink? |
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Local list:TList = New TList
list.addlast("one")
list.addlast("two")
Local link:TLink = List.addlast("four")
link._value = "three"
Local s$
For s=EachIn list
Print s
Next
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| Crap _value is in Tlink. Where do you guys learn this stuff?? |
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| BRL.LinkedList or, C:\Program Files\BlitzMax\mod\brl.mod\linkedlist.mod Often, I've found that viewing source files can be a very good source of documentation. |
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Behold the stupidist example in the world!' arrays.bmx SuperStrict Framework brl.basic Local arr:Int[]=[9,8,7,6,5,4,3,2,1] Local i:Int Print "-arr contents" For i=EachIn arr Print i Next Print "-arr.length" Print arr.length arr=arr[..18] Print "-arr.length after slice operator" Print arr.length Print "-arr 0..8 loop" For i=0 To arr.length-1 Print arr[i] Next |
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| Ok, I have a Tlink to the current Tlist object. I want to go back N times in the list but I have to avoid loosing my current Tlink if N times is too many. Do I have to store the Tlink or is there a smarter way? |
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Type tdatum
Field value:Int
Field link:TLink
End Type
Global list_mylist:TList=New TList
'some data
Local i:Int,da:tdatum
Local curlink:TLink,prevlink:TLink
For i=1 To 10
da=New tdatum
da.value=i*10
da.link=list_mylist.addlast(da)
Next
'print the content of the list
For da=EachIn list_mylist
Print "> "+da.value
Next
'find the item in the list with VALUE=60
For da=EachIn list_mylist
If da.value=60
'curlink=da.link ' this is a FASTER solution
'or ...>
curlink = list_mylist.FindLink(da) ' this is SLOW ->
' Bmax need to scan the entire list to find the link...better saving it into the user-type
End If
Next
If curlink<>Null
Print "New link found..."
Print "Move BACK of 3 link..."
For Local s:Int=1 To 3
prevlink=curlink.PrevLink()
' you should check if PREVLINK is null or not...
curlink=prevlink
Next
Print "Now What is value of CURLINK? ="+tdatum(curlink.value()).value
'you need to CAST into your type ... link.Value() will return an OBJECT
End If
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| How do you continue code to the next line? Is it ..? Edit: too slow. :) |
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