#14159: Don't install callbacks on values of TripleDict, MonoDict
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Reporter: nbruin | Owner: tbd
Type: PLEASE CHANGE | Status: new
Priority: major | Milestone: sage-5.8
Component: PLEASE CHANGE | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by SimonKing):
What do you mean by "value under that key"?
Ah! You mean this situation: `T[a,b,c]=v` and later `T[a,b,c]=w`. Then v
might become garbage collected and its callback would remove w from the
dictionary.
Indeed, this would be bad.
Potential solutions (two alternatives):
1. The callback shall test whether the value in the entry to be deleted
coincides with the value that is being garbage collected.
2. If an existing entry is overwritten by `__setitem__` then its callback
will be removed.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14159#comment:1>
Sage <http://www.sagemath.org>
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