[Cython] wrapping c++

[Robert Bradshaw]

On Mar 4, 2008, at 9:07 AM, Stefan Behnel wrote:

> Neal Becker wrote:
>> Stefan Behnel wrote:
>>
>>> William Stein wrote:
>>>> cdef extern from "":
>>>>     void DEFINE_SET "#define SET(a,b,c) a[b]=c; //"()
>>>>     void SET(intvec, int, int)
>>>> DEFINE_SET()
>>>>
>>>> The key thing is the evil dirty trick to define a SET macro  
>>>> directly in
>>>> Cython.
>>>
>>> "Evil" and "dirty" were exactly the two words that came to my mind
>>> before I even got to reading your own comment on this. :)
>>>
>>> I would really put something like this into an external header  
>>> file, and
>>> just declare "SET()" as being external...
>>>
>> Any thoughts on what it would take to support a non-evil  
>> implementation?
>
> The above is ok, except that I wouldn't write something like this  
> into a
> Cython file. You will likely need a header file for a couple of low- 
> level
> things anyway, so I would just create one with the "#define" above and
> keep the 'cdef extern from "theheader.h"' for the "SET()" function  
> (read:
> macro).


I've been thinking about adding C++ operator support to Cython. I'm  
not sure of the best syntax to use for this, but it should be  
possible to tell Cython that a certain type has overloaded operators,  
and also to be able to specify a specific function to use for such  
operators (for example, this would be useful in numpy for fast  
indexing of arrays--one would define a macro that does the dirty work  
and it would be like the PEX a{i,j}.

- Robert