#11935: Make parent/element classes independent of base rings
---------------------------+------------------------------------------------
Reporter: SimonKing | Owner: nthiery
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.3
Component: categories | Keywords: parent class, element class,
category
Work_issues: | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #9138 #11900 #11943
---------------------------+------------------------------------------------
Changes (by SimonKing):
* dependencies: #9138, #11900 => #9138 #11900 #11943
Old description:
> At #11900 and [http://groups.google.com/group/sage-combinat-
> devel/browse_thread/thread/99c74827d704e677 sage-combinat-devel], as well
> as in some comments in sage/categories/category.py, the idea was
> discussed to make, for example,
> `Algebras(GF(3)).parent_class==Algebras(GF(5)).parent_class` - hence,
> make the parent/element classes as independent from the base of a
> category as possible.
>
> Apply only one of the two patches, at your choice!
New description:
At #11900 and [http://groups.google.com/group/sage-combinat-
devel/browse_thread/thread/99c74827d704e677 sage-combinat-devel], as well
as in some comments in sage/categories/category.py, the idea was discussed
to make, for example,
`Algebras(GF(3)).parent_class==Algebras(GF(5)).parent_class` - hence, make
the parent/element classes as independent from the base of a category as
possible.
Apply [attachment:trac11935_weak_pickling_by_construction_rel11943.patch]
--
Comment:
I decided to make this ticket depend on #11943, for two reasons: Firstly,
it is rather clear that #11943 is a good idea, while I am less sure here
(it is good for speed, but may under very particular circumstances break
new pickles). Secondly, #11943 seems less invasive than the patch here.
I think that the "potentially breaking new pickles in a distant future"
aspect is less urgent with the "weak pickling by construction" approach.
Hence, I have only updated the second patch, the first can now be
disregarded.
Apply trac11935_weak_pickling_by_construction_rel11943.patch
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11935#comment:15>
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