Object wierdness

BlitzMax Forums/BlitzMax Beginners Area/Object wierdness

John-D

(Posted 2005) [#1]

Much though I love the OO aspects of BlitzMax (Mac version), I'm experiencing some wierdness.

I have the following user type defined:

Type entity_t
Field x,y
Method Update() Abstract
Method DrawGame() Abstract
Method DrawMap() Abstract
End Type

This type is then extend as follows:

Type wall_t Extends entity_t

Method DrawMap()
drawimage editWALL, x*16, y*16
End Method

Function Create:wall_t(dx:Int,dy:Int)
Local w:wall_t = New wall_t
w.x = dx
w.y = dy
Return w
End Function

End Type

I attempt to create a new instance of the type using:

levelList.AddLast(wall_t.create(x,y))

and the compile fails with:

Compile Error:Unable to create new object of abstract type 'Type'

The lines generating the error is this one:

Local w:wall_t = New wall_t

Anyone have any ideas what I'm doing wrong?

Cheers

John

QuietBloke

(Posted 2005) [#2]

Your base class entity_t has three abstract methods. The wall_t type extends this class but only defines one of the abstract methods. If you define the other two abstact methods I suspect the program will compile.

John-D

(Posted 2005) [#3]

Ahhhhh. Yup, that did the trick :)

Thanks

John