How do I decide whether a method-function pointer belongs in the instance structure or class structure in GObject? but in gstreamer more function pointers put into instance structure，why？

[Sebastian Dröge]

On Mo, 2015-12-28 at 00:57 -0800, zhang007z wrote:
> According to OOP concept and GObject conventional advice, try to put
> function method pointers of instance structure into class structure.
> I realize that function pointers of gstreamer instance structure also
> entirely could put into class structure. I don't understand that why
> some pointers put into instance structure and other some put into
> class structure? Is its cause relation with the mechanism of
> implementating gstreamer? or is it only the convention of gstreamer ?

It depends. The only place where it is not done as a virtual method
(i.e. not in the class struct) is in GstPad. The reason here is that a)
you would otherwise need a lot of GstPad subclasses and b) those are
more like signals than virtual methods conceptually.

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com

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