Hi Mark!
On Thu, May 30, 2013 at 08:15:22PM -0700, Mark Shimozono wrote:
> I am trying to make a parent with multiple realizations. I looked
> at the tutorial
>
> sage: C = Sets().WithRealizations().example()
> sage: C??
>
> The calling and parameter passing mechanisms are escaping me here.
>
> Inside the scope of
>
> class SubsetAlgebra
>
> there is the
>
> class Fundamental
>
> with initialization
>
> def __init__(self, A):
>
> It is invoked by
> B = A.Fundamental()
> where A is an instance of the subset algebra.
>
> Normally this only passes one parameter.
> How does the __init__ method receive the parameter A?
The magic is in:
class Fundamental(..., BindableClass):
...
It makes Fundamental behave like a method in that A.Fundamental() is
equivalent to Fundamental(A). This saves you from having to write a
wrapper method doing just that for each of your realizations.
> Also, how does
>
> B.realization_of()
>
> know what it should return?
In the __init__ of Fundamental, B's category is set to ``A.Bases()``,
and B.realization_of() gets the information from there.
> Finally, if I were to write an element class for the Fundamental basis,
> how can I inform the parent class about its element class?
> I had trouble with the Element =
> declaration.
This should work as usual. I guess I would need a sample of code to
analyze what went wrong.
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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