On Oct 1, 2009, at 7:17 AM, Neal Becker wrote:
> I need to code some cython functions which will be instantiated for
> several
> different data types. Very much like what c++ templates are used for.
>
> What approaches can be used to do this?
>
> (I'm guessing some kind of macro text processing. Does cython use
> cpp?)
>
> Now suppose in general I need a little more intelligence. For
> example,
> suppose I have a function that is templated on a single datatype.
> Suppose
> some types internal to that function depend in a (possibly
> nontrivial way)
> on that datatype. Same approach?
>
> How about a function templated on multiple datatypes?
Somewhat hackish is to do this with a pxi.
Define a pxi using a dummy type, e.g.
cdef class Wrapper:
cdef TYPE value
cdef set(self, TYPE value):
self.value = value
cdef TYPE get(self):
return self.value
...
Then make several pyx/pxd files that do
ctypedef TYPE double
include "wrapper.pxi"
And voila, "templates."
Of course, eventually we'll want to have a much nicer way of doing
this, e.g. being able to template cdef classes like you can in C++
(though I don't think we want to go with the full template
metaprograming model they have).
- Robert
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