#16517: Allow CovariantFunctorialConstruction to work with Category_singleton
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Reporter: tscrim | Owner: tscrim
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: categories | Keywords: sd59
Merged in: | Authors: Travis Scrimshaw
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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There is a todo block in `category_with_axiom.py` starting at line 1249;
this does the first one:
{{{
- A functorial construction category (Graded, CartesianProducts,
...) having a :class:`Category_singleton` as base category
should be a :class:`CategoryWithAxiom_singleton`.
Nothing difficult to implement, but this will need to rework the
current "no subclass of a concrete class" assertion test of
:meth:`Category_singleton.__classcall__`.
}}}
This is needed in #16513 to have the differential semirings as a
construction.
What I'm currently doing in #16513 is making the check for an ABC of
`Category_singleton` in `Category_singleton.__classcall__()` much weaker
(and potentially more time consuming) by looking through the entire MRO.
I've separated this off here.
--
Ticket URL: <http://trac.sagemath.org/ticket/16517>
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