#13378: Do not cache the non-existence of coerce/convert map too often, and do
not
pretend that there is a conversion where it doesn't make sense at all
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Reporter: SimonKing | Owner: robertwb
Type: defect | Status:
needs_review
Priority: major | Milestone: sage-5.6
Component: coercion | Resolution:
Keywords: coercion conversion object cache | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: | Stopgaps:
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Comment (by SimonKing):
PS: If P is not a category object nor a type, it is impossible that there
is a coercion map from P to self. Therefore the patch introduces a short
cut: ``self.coerce_map_from(P)`` immediately returns None, and does not
try to find a coercion map by a costly backtrack algorithm.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13378#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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