#14711: Memleak when creating QuadraticField
-------------------------------------+-------------------------------------
Reporter: jpflori | Owner: davidloeffler
Type: defect | Status: new
Priority: critical | Milestone: sage-5.13
Component: number fields | Resolution:
Keywords: memleak, number | Merged in:
field, QuadraticField | Reviewers:
Authors: Simon King | Work issues: Provide copy of
Report Upstream: N/A | composed maps
Branch: | Commit:
u/SimonKing/ticket/14711 | Stopgaps:
Dependencies: |
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Changes (by {'newvalue': u'Simon King', 'oldvalue': ''}):
* work_issues: => Provide copy of composed maps
* author: => Simon King
Comment:
I have pushed two more commits, and now ''all'' doctests should pass (to
be verified).
I also think I have extensively explained the rationale behind the
changes. Hence, I have already clicked "Needs review". But it was too soon
(see below).
A potential "todo": We might want that a weakened map returned by
`P.coerce_map_from(Q)` will print as
{{{
sage: QQ['x'].coerce_map_from(QQ)
This is a map used by the coercion system.
If you want to use it outside of the coercion system,
please use a copy of the map
sage: copy(_)
Polynomial base injection morphism:
From: Rational Field
To: Univariate Polynomial Ring in x over Rational Field
}}}
In this case, we may want to have `__copy__` methods everywhere. Even
though the current branch improves copying, I just obtained the following
crash that I want to fix first:
{{{
sage: QQ['x'].coerce_map_from(ZZ)
Composite map:
From: Integer Ring
To: Univariate Polynomial Ring in x over Rational Field
Defn: Natural morphism:
From: Integer Ring
To: Rational Field
then
Polynomial base injection morphism:
From: Rational Field
To: Univariate Polynomial Ring in x over Rational Field
sage: phi = copy(_)
sage: phi(2)
<SEGFAULT>
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/14711#comment:86>
Sage <http://www.sagemath.org>
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