#12978: conditionally_defined decorator for methods and nested classes
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Reporter: nthiery | Owner: jason
Type: enhancement | Status: new
Priority: major | Milestone: sage-
Component: misc | wishlist
Keywords: categories, | Resolution:
conditionally_defined | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nthiery):
Replying to [comment:3 SimonKing]:
> Do I understand correctly that you want the following behaviour:
> {{{
> #!python
> class A(object):
> def my_method(self, *args,**kwargs):
> <default_implementation>
> class B(A):
> @conditionally_defined(f)
> def my_method(self, *args,**kwargs):
> <other implementation>
> }}}
> such that the default implementation is used when `f(self)` evaluates to
False (or an attribute error is raised if the the `super(B,B)` does not
define `my_method`), and uses the specialised "other implementation" if
`f(self)` evaluates to True?
+1
> I am pretty sure that one can use lazy_attribute behind the scenes,
> and the job of `@conditionally_defined` would be to create this lazy
> attribute, so that the user does not need to do it.
Definitely!
Cheers,
Nicolas
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Ticket URL: <http://trac.sagemath.org/ticket/12978#comment:4>
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