#14159: Don't install callbacks on values of TripleDict, MonoDict
------------------------------+---------------------------------------------
Reporter: nbruin | Owner: tbd
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.8
Component: memleak | Resolution:
Keywords: | Work issues: Make part the coverage script
happy
Report Upstream: N/A | Reviewers: Nils Bruin
Authors: Simon King | Merged in:
Dependencies: #13387 | Stopgaps:
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Comment (by SimonKing):
What I suggest is the following:
{{{
sage: from sage.structure.coerce_dict import MonoDict
sage: import gc
sage: M = MonoDict(13)
sage: MW = MonoDict(13, weak_values=True)
sage: class Foo: pass
sage: a = Foo()
sage: b = Foo()
sage: k = 1
sage: M[k] = a
sage: MW[k] = b
sage: M[k] is a
True
sage: MW[k] is b
True
sage: k in M
True
sage: k in MW
True
sage: import gc
sage: del a,b
sage: _ = gc.collect()
sage: k in M
True
sage: k in MW
False
sage: len(MW)
0
sage: len(M)
1
sage: MW[k] = int(5)
sage: MW[k]
5
}}}
Hence, we have the option to use weak values, but even in that case we
would accept non-weakrefable values, too.
And, similarly, for `TripleDict`, with using `weak_values` for the homset
cache.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14159#comment:25>
Sage <http://www.sagemath.org>
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