#11115: Rewrite cached_method in Cython
---------------------------+------------------------------------------------
Reporter: SimonKing | Owner: jason
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7
Component: misc | Keywords: category cython cache
Author: Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Description changed by SimonKing:
Old description:
> In order to make full use of the parent and element methods of a
> category, it should be possible to define a ''cached'' method in the
> category, so that any object of that category inherits it ''with
> caching''.
>
> Currently, it fails as follows:
> {{{
> sage: class MyCategory(Category):
> ....: def super_categories(self):
> ....: return [Objects()]
> ....: class ParentMethods:
> ....: @cached_method
> ....: def f(self, x):
> ....: return x^2
> ....:
> sage: cython("""from sage.structure.parent cimport Parent
> ....: cdef class MyClass(Parent): pass
> ....: """)
> sage: O = MyClass(category=MyCategory())
> sage: O.f(4)
> 16
> sage: O.f(x) is O.f(x)
> False
> }}}
>
> So, the method is inherited, but not cached.
>
> Also, cached_method could be a lot faster.
>
> Depends on #9976
New description:
Broadening the original description of the ticket:
The aim is to provide a Cython version of the cached_method decorator.
There are three benefits:
1)
Speed (see timings in the comments)
2)
Using cached methods in Cython code.
3) Parent and element methods of categories
Let me elaborate on the last point:
In order to make full use of the parent and element methods of a category,
it should be possible to define a ''cached'' method in the category, so
that any object of that category inherits it ''with caching''.
Currently, it fails as follows:
{{{
sage: class MyCategory(Category):
....: def super_categories(self):
....: return [Objects()]
....: class ParentMethods:
....: @cached_method
....: def f(self, x):
....: return x^2
....:
sage: cython("""from sage.structure.parent cimport Parent
....: cdef class MyClass(Parent): pass
....: """)
sage: O = MyClass(category=MyCategory())
sage: O.f(4)
16
sage: O.f(x) is O.f(x)
False
}}}
So, the method is inherited, but not cached.
Depends on #9976
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11115#comment:4>
Sage <http://www.sagemath.org>
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