Hi,
Arnaud Bergeron wrote:
> Sorry if this is the wrong list to ask questions like that, I couldn't
> find any other list for cython.
cython-dev is our general purpose list, so it's fine to ask here.
> I am looking for a way to implement the uniqueness of a class in
> Cython.
You mean a singleton. A class is always unique, but it's instances are not
necessarily.
There are many recipes for implementing singletons in Python, many of which
also work in Cython.
> I have a class say:
>
> cdef class Unique(object):
> cdef val
>
> def __init__(self, val):
> self.val = val
>
> And I want to have only one instance at a time with a single value of val.
If you meant one instance for each distinct value of val, then a factory might
work:
cdef class _Unique(object):
cdef object __weakref__
...
def Unique(val):
# do your usual WeakValueDictionary handling here.
return the_right_instance
> And if this requires monkey-patching the tp_new slot of the class,
> perhaps some pointers as to what should the replacement method should
> at least do in order not to screw the rest of the system.
I'd avoid that for now, unless you really require subclassing support etc.
Stefan
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