#12941: Cache should be cleared on cloning
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Reporter: hivert | Owner: hivert
Type: defect | Status: new
Priority: major | Milestone: sage-5.1
Component: combinatorics | Resolution:
Keywords: Clone, cache, days38 | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Florent Hivert | Merged in:
Dependencies: | Stopgaps:
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Comment (by mjo):
Replying to [comment:7 sdenton]:
> mjo:
> The idea of the cloneable array is that you make a clone, modify it, and
then at the end of that modification the array should fit the parameters
defined by the class, though it is itself a new object. The array is only
mutable during this cloning process; I think the f1[1]=100000 line should
not be allowed, if my understanding is correct.
[[BR]]
Sorry, you're right. I botched my test. This does work:
{{{
sage: f = Foo(Parent(), [1,2,3])
sage: f1 = f.clone()
sage: f1[1] = 10000
sage: f1
[1, 10000, 3]
}}}
but doesn't do what I think it does. (I hit `up` a bunch of times, and
apparently that's what I typed earlier when I should have done `with
f.clone()...`)
[[BR]][[BR]]
> My understanding is that there's a push to switch from using the
CombintaorialObject class to the ClonableArray class, which would make
this cloning behavior a rather common occurrence.
[[BR]]
I still think the bug is in `Foo`. I could instead cache `sum()` in
`self._cache`; would the superclass still be responsible for that?
Another philosophical argument: `copy()` should make a copy.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12941#comment:8>
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