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Re: helper class instance creation

Subject: Re: helper class instance creation
From: Godfrey van der Linden <email@hidden>
Date: Thu, 2 Jun 2005 14:00:10 -0700
Delivered-to: email@hidden
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OSObject doesn't come with that much overhead. It implements a reference counting mechanism and that is about it.

However that isn't really the issue. You will need to implement at least one object that IS an IOService subclass otherwise your drivers wont match. Since multiple inheritance is not allowed it means that your abstract class will probably need to inherit from IOService. Fortunately this is exactly the model that Families provide and you can use our Family infrastructure to help you, It may even be possible to deliver your project as three kexts, a family and 2 driver kexts.

Finally if you don't inherit from OSObject (or IOService) then you can use 'new' or even just create static or automatic classes. Remember thought that you will have significant binary compatibility issues if you split your code into multiple kexts.

Check out IOKit's use of

OSDeclareAbstractStructors() & OSDefineMetaClassAndAbstractStructors()

Godfrey

On 06/02/2005, at 12:41 , Parav Pandit wrote:

Hi,
 have one abstact class which represent my HBA card.
and 2 other classes derived from this abstract class.
Each one for different HBA.
This is not a driver class. It is just helper class.
This absract class is NOT derived any IOService or
OSObject or any other OS classes.
But I need the inheritance capability.
My question is :
How to create an instace of this independent class?
Can I use the "new" operator?
Or should I derive from OSObject?
But I don't want that big overhead for small
functionalies.
Or something else?
Regards,
Parav
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