#4536: [with patch, needs review] Various number field order and ideal utilities
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Reporter: cremona | Owner: was
Type: enhancement | Status: new
Priority: major | Milestone: sage-3.2.1
Component: number theory | Resolution:
Keywords: number fields, orders, ideals |
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Comment (by cremona):
Replying to [comment:3 mhansen]:
> Replying to [comment:2 cremona]:
> > Quick answer: it never occurred to me to do it any other way! But
isn't it completely standard in Sage that when an object has a property
(such as the norm for an ideal) then one computes it the first time and
caches it so that further requests for the property used the cached value?
This is surely different from caching values of a function.
>
> The cached_method decorator is relatively new which is why it isn't in
use throughout Sage. For an example, see the groebner_basis method in
sage/rings/polynomial/multi_polynomial_ideal.py
>
> That's exactly what the cached_method decorator does except that it also
handles the case where arguments are passed into the method. The values
are cached in a dictionary attribute on the object itself so it gets
garbage collected correctly. It also supports things such as clearing the
cache, etc.
That looks brilliant, and had completely passed me by. I'll start using
it right away! It would also be a good idea to start to systematically
use it all over (wouldn't it) -- then people would see it and use it
themselves.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4536#comment:4>
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