#13394: Write a WeakValueDictionary with safer key removal
-------------------------------------+-------------------------------------
Reporter: nbruin | Owner: rlm
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: Simon King | Reviewers:
Report Upstream: None of the above | Work issues:
- read trac for reasoning. | Commit:
Branch: | fab0ed4112b9f798e2690f4c885b57cd711ea698
u/SimonKing/ticket/13394 | Stopgaps:
Dependencies: |
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Comment (by SimonKing):
PS: We don't even need a hash collision to fool Python's dicts.
{{{
sage: D = {}
sage: class Key(object):
....: def __hash__(self):
....: print "hash of",id(self)
....: return 6
....: def __cmp__(self, other):
....: print "inserting 5"
....: D[5] = ZZ
....: return self is other
sage: D[Key()] = QQ
hash of 215852940
sage: D[Key()] = ZZ
hash of 215852524
inserting 5
sage: len(D)
2
sage: D.keys()
[5, <__main__.Key at 0xcdda78c>]
sage: id(_[1])
215852940
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/13394#comment:48>
Sage <http://www.sagemath.org>
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and MATLAB
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