return same type of object
bdesth.quelquechose at free.quelquepart.fr
Wed Oct 25 00:28:00 CEST 2006
David Isaac a écrit :
> Bruno wrote:
>>This is usually known as a 'factory method'. You do realise that both
> solutions are *not* strictky equilavent, do you?
> Your point I believe is that after inheritance the factory method
> in the subclass will still
> return MyClass()
> but will return an instance of the subclass if I
> return self.__class__()
> You did not comment further so I take it your view is that
> each is fine, pick the one that gives the behavior you want.
I did not comment because I don't know which behaviour is appropriate in
> But Steve suggests going with the latter.
That's what I'd do too a priori.
> Here is an (very crude) argument for going with the latter:
> if you know you want an instance of MyClass(),
> you can do that directly,
Sure, but that's another point. If you want an instance of a subclass of
MyClass, you can also do that directly !-)
MVHO is that in most cases, one would expect such a factory method to
play nicely with subclassing. But as I said, this is not a hard rule.
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