#9468: Extend ClasscallMetaclass to allow for membership testing
---------------------------------+------------------------------------------
Reporter: nthiery | Owner: jason
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.5
Component: misc | Keywords:
Author: Nicolas M. Thiéry | Upstream: N/A
Reviewer: Florent Hivert | Merged:
Work_issues: |
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From the doc:
{{{
Let ``cls`` be a class in :class:`ClasscallMetaclass`, and
consider
a call of the form:
``x in cls``
If ``cls`` defines a method ``__classcontains__``, then this
results in a call to::
- ``cls.__classcontains__(cls, x)``
EXAMPLES:
We construct a class which implements membership testing, and
which contains ``1`` and no other x::
sage: from sage.misc.classcall_metaclass import
ClasscallMetaclass
sage: class Foo(object):
... __metaclass__ = ClasscallMetaclass
... @staticmethod
... def __classcontains__(cls, x):
... return x == 1
sage: 1 in Foo
True
sage: 2 in Foo
False
}}}
This patch also fixes some typos and such in the documentation of
ClassCallMetaclass
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9468>
Sage <http://www.sagemath.org>
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