There's a lot of email today but as I finished one part I'm staking out
the course again.
I'm thinking about letting the class author specify default buffer
options. Something like this:
cdef extern class Image ...:
__cythonbufferdefaults__ = {'ndim' : 2}
__cythonbuffermandatory__ = {'dtype': unsigned char, indirect=True}
__cythonbufferalways__ = True
[1]
I think this makes a lot of sense, as the author of the Image class
might export exactly this kind of buffer and nothing else. With the
above settings, one would automatically get efficient indexing on all
"cdef Image" instances.
NumPy is kind of special in the flexibility it provides, but even there,
setting indirect=False can provide a speedup transparently. Once the
indirect option is implemented at all, that is :-) but that *must*
happen to make NumPy as efficient as possible.
As for priority, I guess this is below most of what I've talked about so
far. Though it might suddenly look like a low hanging fruit that I go
for when I need a break from other stuff.
[1] (Well, I consider custom parsing for that last line better than
inventing a wholly new syntax...and we've been talking about new
Python-style type references as well, which fits in here)
--
Dag Sverre
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