#14711: Weak references in the coercion graph
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Reporter: jpflori | Owner: davidloeffler
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-6.2
Component: number fields | Resolution:
Keywords: memleak, number | Merged in:
field, QuadraticField | Reviewers: Nils Bruin, Jean-
Authors: Simon King, | Pierre Flori
Travis Scrimshaw, Jean-Pierre | Work issues:
Flori | Commit:
Report Upstream: N/A | ea58b22f0bf2652e7d04b3d55e6217dcb8732cdf
Branch: | Stopgaps:
public/ticket/14711 |
Dependencies: |
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Comment (by jpflori):
Replying to [comment:219 nthiery]:
> Hi!
>
> Replying to [comment:215 tscrim]:
> > I've actually changed `TriangularModuleMorphism` to print out a copy
of itself when raising an error because I didn't like the WARNING message
being displayed. (FTR, they were being used as expected since they are
suppose to be internal coercions.)
>
> Sorry, I haven't been following the details. Having to change the
> code of existing morphisms when the usage is as expected feels like a
> smell (one more thing to think about when using/implementing
> morphisms). If I understand properly, in certain circumstances, one
> has to make copies of morphisms. Is it described somewhere in the
documentation what those
Not with Travis last changes.
Now the `coerce/convert_map_from` methods return "safe" objects for which
the copying was automatically done.
It's only the `_internal_` prefixed methods which return weakened objects
but might be faster as no copies are involved.
--
Ticket URL: <http://trac.sagemath.org/ticket/14711#comment:220>
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