#4740: avoid creating unneeded homsets when coercing
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Reporter: mabshoff | Owner: robertwb
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.11
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: Mike Hansen | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Comment (by SimonKing):
Next observation: If one creates
{{{
sage: I = F.coerce_map_from(F)
}}}
and then does `del I`, the homset is again erased from the cache.
But this must not happen! Namely, `F.coerce_map_from(...)` is supposed to
use a cache. Granted, the cache is again using weak keys (via
`TripleDict`), but as long as `F` is kept in memory, the coercion from F
to F must not vanish.
--
Ticket URL: <http://trac.sagemath.org/ticket/4740#comment:17>
Sage <http://www.sagemath.org>
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