On 01/14/2015 01:10 PM, jason wrote:
On Wednesday, January 14, 2015 at 12:05:55 PM UTC-5, Mark Lawrence wrote:
I'm confused, can you please explain what you're trying to achieve
rather than how you're trying to achieve it and I'm sure that others
will give better answers than I can :)
Good call. Coming up with a minimal example make things pretty far out of
context.
The base class represents a generic function (in formal logic) with some name
and a list of parameters. The derived class is some sort of specialization of
that generic class (like associative functions, etc).
It is desirable to do certain things to these functions, like perform
substitution or canonization, that can be implemented in the basic class but
which I'd like to return as a copy rather than modify the class. Thus, the base
class needs to know which derived class (if any) to create.
The burden is indeed on me to keep the signature of the init() for each of
these the same.
If there are additional parameters possible, you might be able to use
*args, **vargs to pass them through the call.
--
DaveA
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