#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:3 hivert]:
> I think that in {{{Element}}} method {{{__copy__}}} line 427 (sage
5.0rc0) the
> following line...
> Should be fixed not to copy cached methods
[[BR]]
But this affects all of the mutable classes in which caching is handled
correctly. If instances of `Bar` are mutable and invalidate the cache when
modified, why shouldn't a `b = Bar(); copy(b)` also copy the cache?
This only helps in a very specific case (immutable superclass with no
cached methods and mutable copies), and even then only when a bug actually
exists in the subclass. Trying to predict everything that subclasses might
do wrong within the superclass is the path to unhappiness (and breaks
encapsulation) =)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12941#comment:5>
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