Stefan Behnel wrote:
> Dag Sverre Seljebotn, 03.02.2010 10:22:
>
>> Me and Kurt's been talking about (finally) getting the memory views
>> merged.
>>
>
> Could you add a sentence or two on what we are talking about here? We've
> had several discussions in the past regarding various kinds of memory views
> and array types.
>
These are the ones implemented by Kurt last summer, and which was
discussed in that painstakingly long discussion which ended with Robert
being pronounced BD.
I.e.:
cdef int[:,::1] arr = some_object # acquires C-contiguous PEP 3118 view
cdef int[:,::1] other = arr # refcounted assignment without requesting a
new view
cdef func(int[:, ::1] arr): # takes an efficient custom Cython struct
pass
and so on. Currently it only supports some automatic buffer copying
(Kurt can explain better exactly what) and direct access to underlying
buffer pointers and shape/strides, i.e. syntax candy. Obviously
efficient indexing should be added, which is relatively easy.
I am aware that full documentation in the form of a CEP is somewhat
lacking (that is, things have shifted a bit since the CEPs were
written), but as it is, if I were to update the CEPs I wouldn't have
time to actually get this merged, and I'd really prefer to finish things
first, then document it.
Rationale: Like I said last summer, my stance here is primarily "let's
reserve a corner of the syntax for the stuff numeric users/data pushers
need", and let things evolve out of what people actually use and request
and implement, not out of academic discussions on the mailing list. I
just don't have time for the latter.
(Sorry for going into defensive position immediately, but the experience
from last summer still haunt me.)
Dag Sverre
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