On 08/23/2010 10:14 AM, Avi Kivity wrote:
On 08/23/2010 05:47 PM, Anthony Liguori wrote:
Devices can contain references to structs and objects. If a
Device contains a reference to an object, the object should be
stored in a BusState which is a container of Devices. Therefore,
the object should inherit from Device.
I disagree. It's up to the author to decide whether to split a
Device into 1 or 15 objects.
If one of the other objects is also a subclass of DeviceState, then
you're probably violating that DeviceState's contract. But that's
a different (and trivial) matter.
(side point: in C no objects have constructors and methods. in C++
all objects have constructors and methods, even PODs)
Things that inherit from DeviceState have ctors/dtors. Things that
don't end up inventing their own and probably will do so poorly.
you mean misimplement other_state_init(OtherState *) and
other_state_destroy(OtherState *)?
And hot plug, save/restore, properties, and all of the other things
that go along with qdev.
Hot plug is a good example of how easy it is to screw this up by not
having the right hooks being propagated through the device model.