#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):
Look at the following snippet from `Parent.coerce_map_from(self,S)`:
{{{
#!python
if S == self:
# non-unique parents
if unique_parent_warnings:
print "Warning: non-unique parents %s"%(type(S))
return self._generic_convert_map(S)
}}}
`self._generic_convert_map(S)` does not do caching.
Hence, the general problem is: A coercion from self to self will never be
cached.
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Ticket URL: <http://trac.sagemath.org/ticket/4740#comment:18>
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