#16353: A cached_function with selective memory
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.3
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
performance | Work issues:
Keywords: | Commit:
Authors: | 7eb8f900f1a143c6cc85b9382a365b57a9c42ecc
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/16353 |
Dependencies: |
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Comment (by ncohen):
> How can you tell from the input parameters whether the caller is going
to mutate the result you're returning?
`O_O`
It is simple :
1) If I can use the feature implemented in this branch
--> I can only cache the return values I am interested in caching (they
are boolean-->immutable) and I can return other values as immutable types,
which is their most natural type.
2) If I cannot use the feature implemented in this branch, I have to use
cached_method
--> Thus I have to cache everything that my function returns, and so I
cannot return immutables types anymore. And I have to return tuples of
tuples instead of lists, which complicated matters uselessly.
> Surely a non-internal routine will have uniform input/output
specifications, i.e., always return either mutable types or immutable
types?
No. My function returns booleans or lists of lists, depending on what the
user asks. If I have to make it tuples of tuples and cache them for
naught, it's a waste for everybody.
With this branch, I can cache only what I want and not have to change what
my function returns to fit the cached_method's needs.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/16353#comment:39>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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