#12603: copying cached_methods does not work properly
-----------------------------+----------------------------------------------
Reporter: saraedum | Owner: jason
Type: PLEASE CHANGE | Status: new
Priority: minor | Milestone: sage-5.0
Component: misc | Keywords: cached_method, cache
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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A few funny things can happen when copying cached methods:
{{{
sage: class A:
... @cached_method
... def f(self):
... return 1
...
sage: class B:
... g=A.f
... def f(self):
... return 2
...
...
sage: b=B()
sage: b.f()
2
sage: b.g()
1
sage: b.f()
1
}}}
The problem is that a call to b.g leads to a new MethodCaller in b.f;
something similar happens here:
{{{
sage: class C:
... g=A.f
...
sage: c=C()
sage: c.g is c.g
False
sage: c.g is c.f
True
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12603>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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