#13566: Simplicial complex examples as singletons
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Reporter: tscrim | Owner: tscrim
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-5.6
Component: algebraic topology | Resolution:
Keywords: simplicial | Work issues:
Report Upstream: N/A | Reviewers: Travis
Scrimshaw
Authors: Christian Nassau, John Palmieri | Merged in:
Dependencies: #13244, #12587 | Stopgaps:
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Comment (by SimonKing):
Sorry, I did not read the whole discussion, but I see in the patch that
cached_method is used. Hence, the constructed simplicial complexes will be
kept in memory indefinitely. Wouldn't it be a better idea to turn
simplicial_complexes into a `UniqueFactory`?
Of course, in a `UniqueFactory` one would usually ask for a Klein bottle
by `simplicial_complexes("KleinBottle")`. But of course one could still
define methods `KleinBottle` and so on, so that
`simplicial_complexes.KleinBottle()` is equivalent to
`simplicial_complexes("KleinBottle")`.
The latter could be automatised by a `__getattr__` method:
{{{
def __getattr__(self, s):
return lambda : self(s)
}}}
Why would that solve the problem with permanent caching? Well,
`UniqueFactory` will soon be using weak dictionaries for caching (in fact
it already uses weak references, but improperly, and that's supposed to be
fixed in #12215).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13566#comment:23>
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