Overiding methods help needed
BlitzMax Forums/BlitzMax Beginners Area/Overiding methods help needed
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| Can anyone please provide me with a very simple example of how you overide methods and the benefits of doing so as I am having lots of problems trying to figure it out. Any advice would be great. Jason. |
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| You can not overwrite methods other than redefine them with the exactly same type header. so if the original was: Update(timedif:float) then the one on the extended type must be Update(xxx:float) as well you can not remove that nor add something else. nor can you define 2 different versions of update. |
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| I'm not sure if this is a good way to do it but I just had this idea of a way in which you could use overridden methods. You have a base vehicle type which is abstract. That means you cannot make an actual vehicle - it is a template. A vehicle variable can accept any type that extends from it. Here we have smallship and largeship. Each ship has a different upgrade method, and you would put any actions unique to a type of ship in its own type. Only common actions are placed in vehicle. Type vehicle Abstract
Method upgrade:vehicle() Abstract
Method move()
'assuming all vehicles move in the same way put common code in this type
End Method
End Type
Type smallship Extends vehicle
Method upgrade:vehicle()
Local newvehicle:vehicle = New largeship
Return newvehicle
End Method
End Type
Type largeship Extends vehicle
Method upgrade:vehicle()
Local newvehicle:vehicle = New nextship
Return newvehicle
End Method
End Type
'''''''''
Local player:vehicle = New smallship
player = player.upgrade() 'now a bigship |
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