#5120: [with patch, needs review] An alternative implementation of the Unique
Representation design pattern
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Reporter: nthiery | Owner: nthiery
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.0
Component: misc | Resolution:
Keywords: unique representation |
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Changes (by nthiery):
* keywords: => unique representation
Old description:
> Class deriving from sage.structure.UniqueRepresentation class inherit a
> unique representation behavior for their instances. See the documentation
> for a brief discussion of the relative merits of UniqueRepresentation and
> UniqueFactory.
> This is also a generalization of the already existing class
> sage.categories.category.uniq1, which it will eventually supersede in the
> category patch.
>
> This class will be used extensively in upcoming patches (unique
> representation of categories, combinatorial free modules, ...)
>
> Class deriving from sage.structure.UniqueRepresentation? inherit a
> unique representation behavior for their instances (and consistent
> default implementations of equality testing, copying, pickling, ...).
>
> This class is used extensively in upcoming sage-combinat patches:
> - #5879 (crystals)
> - categories
> - free modules
New description:
Class deriving from sage.structure.UniqueRepresentation inherit a
unique representation behavior for their instances (and consistent
default implementations of equality testing, copying, pickling, ...).
See the documentation for a brief discussion of the relative merits of
UniqueRepresentation? and UniqueFactory?.
As a prerequisite, this patch implements sage.misc.ClasscallMetaclass,
a (trivial) metaclass for customizing class calls via a static method
of the class.
This class is used extensively in upcoming sage-combinat patches:
- #5879 (crystals)
- #5891 categories
- free modules
- automatic monoid
~500 lines of doctest for 15 lines of code
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5120#comment:17>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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