#10963: More functorial constructions
-------------------------------------+-------------------------------------
Reporter: nthiery | Owner: stumpc5
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.1
Component: categories | Resolution:
Keywords: days54 | Merged in:
Authors: Nicolas M. Thiéry | Reviewers: Simon King, Frédéric
Report Upstream: N/A | Chapoton
Branch: | Work issues: Detect and fix
public/ticket/10963 | Heisenbugs
Dependencies: #11224, #8327, | Commit:
#10193, #12895, #14516, #14722, | 5ccf253b17c151d8e773037ac634a64f84f03075
#13589, #14471, #15069, #15094, | Stopgaps:
#11688, #13394, #15150, #15506 |
-------------------------------------+-------------------------------------
Comment (by SimonKing):
Here is the proof of concept of a cached function that prevents infinite
recursion by storing some value in its cache:
{{{
sage: @cached_function
....: def bla(x):
....: bla.cache[(x,),()] = None
....: try:
....: if x:
....: return bla(x-1)+2
....: return bla(x) or 100
....: finally:
....: try:
....: del bla.cache[(x,),()]
....: except KeyError:
....: print x,"not stored"
....:
sage: bla(3)
106
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:254>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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