On Wed, Feb 15, 2012 at 02:47:04PM -0800, Anne Schilling wrote:
> Perhaps I need
>
> __metaclass__ = ClasscallMetaclass
>
> @staticmethod
> def __classcall_private__(cls, p, order = None):
Yes, this sounds like it. You have:
sage: type(p)
<class 'sage.combinat.posets.posets.LinearExtensionOfPoset'>
compared to:
sage: type(Core([2,1],4))
<class 'sage.combinat.core.Cores_length_with_category.element_class'>
so p does not inherit the category code.
Alternatively, instead of having a new LinearExtensionOfPoset(P,
[3,1,2]) function, you might want to use an idiom like:
sage: P.linear_extension([3,1,2])
whose implementation would do the analogue of what classcall does for
Cores, i.e. delegate the work to P.linear_extensions()([3,2,1]). This
avoids polluting the main namespace of Sage. There is just the small
issue that P.linear_extension already exists as a method, so one needs
to keep backward compatibility:
sage: P.linear_extension()
... the internal linear extension of P ...
sage: P.linear_extension([3,1,2])
... the linear extension [3,1,2] of P ...
Yet another alternative would be to just have:
sage: P.linear_extensions()([3,1,2])
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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