Thanks Stefan!
On Thu, Jul 2, 2009 at 12:32 AM, Stefan Behnel<stefan...@behnel.de> wrote:
> Hi,
>
> Chris Colbert wrote:
>> I'm thinking this may be what the new array type is for, but i'm not sure.
>>
>> say I have a C struct which I wrap as a class:
>>
>>
>> #mycfile.h
>> struct Foo
>> {
>> int* data[32];
>> };
>>
>> #my_dec_file.pxd
>> cdef exter from "mycfile.h":
>>
>> cdef struct Foo:
>> int* data[32]
>>
>> #my_cy_file.pxd
>> cimport my_dec_file
>>
>> cdef class Foo:
>> cdef my_dec_file.Foo* thisptr
>>
>> #my_cy_file.pyx
>> cimport my_dec_file
>>
>> cdef class Foo:
>> property data:
>> def _get_(self):
>> return self.thisptr.data <----i dont think this will work
>
> Right, it won't.
>
>
>> what I want to be able to do in python is this:
>>
>> <....get an instance of Foo i.e. foo = Foo() ....>
>>
>> b = foo.data[3:6] # where b can be a numpy array or a list, but a
>> numpy array would be better
>>
>> Further, is there a way to manipulate data like that directly via
>> python (i.e. without making a copy).
>>
>> suppose I want to add the value 2 to every value in foo.data[:]
>>
>> it would be nice to do (from python):
>>
>> foo.data[:] + 2
>>
>> Is there a way to implement that on the Cython side?
>
> Sure, just return an object from the "data" property that wraps the array
> and implements __setitem__ and __getitem__ appropriately. Not exactly
> trivial, but not too hard either.
>
> Once Cython has better array support, I guess this would simply become a
> builtin feature.
>
> Stefan
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