#14278: Clear the cache of a cached representation
---------------------------+------------------------------------------------
Reporter: SimonKing | Owner: jason
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.9
Component: misc | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors: Simon King
Merged in: | Dependencies: #14054
Stopgaps: |
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I have seen doctests that try to demonstrate how to clear a cache of class
instances. See sage/modular/abvar/abvar_ambient_jacobian.py, for example.
This made me think: It would be nice to be able to define a class method
for `CachedRepresentation` that clears the cache from all instances of
this class.
With my patch, the following works:
{{{
sage: class A(UniqueRepresentation):
... def __init__(self, x):
... pass
sage: class B(A):
... @staticmethod
... def __classcall__(cls, *args, **kwds):
... return super(B,cls).__classcall__(cls,*args,**kwds)
sage: class C(B): pass
sage: a = A(1)
sage: b = B(2)
sage: c = C(3)
sage: a is A(1)
True
sage: b is B(2)
True
sage: c is C(3)
True
sage: B._clear_cache_()
sage: a is A(1)
True
sage: b is B(2)
False
sage: c is C(3)
False
}}}
Note that B overloads `__classcall__`, but nevertheless the _clear_cache_
methods finds the cache and removes all instances of B and its subclass C.
Sorry, I have no idea what component to choose. Let it be misc, then...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14278>
Sage <http://www.sagemath.org>
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