Hi,
You must bypass the element_class.
1) Convert your base classes to categorized classes using something along
Parent P:
def ___init__(self):
self.element_class_A = self.__make_element_class__(MyElementA)
self.element_class_B = self.__make_element_class__(MyElementB)
2) then you can use these classes (and will benefit from the category stuff)
Parent P:
def _element_constructor_(self, data):
if some_condition(data):
return self.element_class_A(data)
else:
return self.element_class_B(data)
3) In order to make the tests pass (ie TestSuite(P).run()) you must
set P.element to either element_class_A or element_class_B.
Vincent
2014-08-23 10:53 UTC+02:00, Daniel Krenn <kr...@aon.at>:
> I'm going through [1] to construct a new algebraic structure. I have one
> parent, but want more than one elements, which should be associated to
> this parent. More precisely, I have the following classes:
>
> +- MyElementBase
> +-- MyElementA (derived from MyElementBase)
> +-- MyElementB (derived from MyElementBase)
>
> In [1] it says, we should use
> return self.element_class(data)
> in Parent._element_constructor_ to create objects. This creates a class
> derived from Parent.Element (which IMHO should be MyElementBase) and
> Parent.category().element_class.
>
> How can I create "the correct" instance of MyElementA and MyElementB
> inside _element_constructor_ depending on the input? (I want to do this,
> since MyElementA is a specialized version of MyElementBase for some
> inputs; similar MyElementB)
>
> Daniel
>
> [1]
> http://www.sagemath.org/doc/thematic_tutorials/coercion_and_categories.html
>
> --
> You received this message because you are subscribed to the Google Groups
> "sage-devel" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to sage-devel+unsubscr...@googlegroups.com.
> To post to this group, send email to sage-devel@googlegroups.com.
> Visit this group at http://groups.google.com/group/sage-devel.
> For more options, visit https://groups.google.com/d/optout.
>
--
You received this message because you are subscribed to the Google Groups
"sage-devel" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-devel+unsubscr...@googlegroups.com.
To post to this group, send email to sage-devel@googlegroups.com.
Visit this group at http://groups.google.com/group/sage-devel.
For more options, visit https://groups.google.com/d/optout.
