#14214: Cythoned homsets
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Reporter: SimonKing | Owner: tbd
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.10
Component: performance | Resolution:
Keywords: Hom, cython, cached method | Work issues: How to store
domain and codomain?
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #14159, #12951, #13184 | Stopgaps:
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Comment (by nbruin):
Replying to [comment:56 nbruin]:
> Replying to [comment:55 SimonKing]:
> > And I guess you could get it still a bit faster, if you do `def
__get__(self, Parent instance, cls)`, because our homsets are parents, and
because the cdef public attribute `__cached_methods` could be accessed
more quickly if the instance is known to be a Parent.
>
> Excellent idea! if `__cached_method` isn't in a slot then we wouldn't
want to use it anyway. It does mean that we lose flexibility: If for some
reason, we have a class that can't inherit directly from Parent but does
want to cooperate in this protocol, it won't be able to.
Note that `_element_class` on `Parent` is a `@lazy_attribute`. That code
could benefit from a `Parent instance` too, so perhaps you DO want to use
an (adapted form of) `@lazy_attribute` for both. In the case of `_domain`
and `_codomain`, the wrapped function would be irrelevant.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14214#comment:65>
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