Type help

BlitzMax Forums/BlitzMax Beginners Area/Type help

neos300

(Posted 2009) [#1]

Okay here is my basic thing.

Type MainType
Field Type:TType
End Type

Type TType
Method DoSomething()
'Do something
End Method
End Type

Global T:MainType

Now, I want to call the TType's DoSomething method, but I want to do it through T. How can i do this?

Hezkore

(Posted 2009) [#2]

Type MainType
	Field Type:TType
End Type

Type TType
	Method DoSomething()
	'Do something
	End Method
End Type

Global T:MainType
T.Type.DoSomething()

I don't think you can call the field "Type" though, but I'm not sure...

And this should also work:

Type MainType
	Field MyField:int
End Type

Type TType Extends MainType
	Method DoSomething()
	'Do something
	End Method
End Type

Global T:TType
T.DoSomething()

neos300

(Posted 2009) [#3]

No, I want MainType to have a field which is a TType object, and then do something like this:

T.Type.DoSomething()

Any idea how to do that?

GfK	(Posted 2009) [#4]

Type MainType
  Field Type:TType = New TType ' important!  Creates an instance of TType
End Type

Type TType
  Method DoSomething()
    'Do something
  End Method
End Type

Global T:MainType = new MainType
T.Type.DoSomething()

The key point you've missed is that its not enough to define a variable as a specific type. You must also create an instance before you can use it and access its fields/methods/etc.

chimaera

(Posted 2010) [#5]

May I ask what you would like to use this for? It all feels very weird of actually calling a type that is a field within another type.

There is one thing having like a Tlist in a type and the possability to access that.

Type Tplayer
   Field myList:Tlist = new Tlist

    function create:Tplayers()
       local players:Tplayers = new Tplayers
       return players
    end function
end type

global myPlayers:Tplayers = Tplayers.create()
print myPlayers.myList.count()

Sledge

(Posted 2010) [#6]

Type Tplayer
Field myList:Tlist = new Tlist

Invoke the list as global or every instance will have one.

*EDIT*
Here, see this:

SuperStrict

Type TPlayer
	Global list:TList = CreateList()
	
	Field name:String
	
	Function Make:TPlayer(arg_name:String)
		Local newPlayer:TPlayer = New TPlayer
		newPlayer.name = arg_name
		
		ListAddLast list,newPlayer
		Return newPlayer
	End Function
End Type	

Function CreatePlayer:TPlayer(arg_name:String)
	Return TPlayer.Make(arg_name)
End Function

Local player1:TPlayer = CreatePlayer("Bill")
Local player2:TPlayer = CreatePlayer("Jim")
Local player3:TPlayer = CreatePlayer("Sue")

For Local currentPlayer:TPlayer = EachIn TPlayer.list
	Print currentPlayer.name
Next

chimaera

(Posted 2010) [#7]

Yeah, sorry. The naming was a bit odd.

I would call it TPlayerManager. Then create a Tplayer. To create a player I would call TplayerManager.createPlayer() that in turn called a TplayerManager.list.addlast(Tplayer.create()).

Thats how I do it in my new game. Works like a charm.

MACCB

(Posted 2010) [#8]

There is probably a really simple answer but please can someone help. Why when I have called "Superstrict" does this return the error in debug "Compile Error ... Function can not return a value">>>

Type level
Field grid_value%[mapWidth,mapHeight] ' define our map array

Method read(x%,y%)
Return grid_value[x,y]
End Method
Method write(x%,y%,z%)
grid_value[x,y]=z
End Method
End Type

GfK	(Posted 2010) [#9]

You need to tell the method what you want it to return, i.e:

Method read:String(x:int, y:int)
  Return grid_value[x,y]
End Method

That's assuming your grid_value[] is an array of strings, which it may well not be but you get the idea.

MACCB

(Posted 2010) [#10]

That's is great. Thanks that has been bugging me for an hour :)

GfK	(Posted 2010) [#11]

This is the thing with SuperStrict - it assumes nothing. If you don't explicitly tell it, it won't work.