[Cython] calling gmp automatically

[Robert Bradshaw]

On Dec 23, 2008, at 5:46 AM, Dag Sverre Seljebotn wrote:

> Ondrej Certik wrote:
>> Preferably one could use it like this:
>>
>> cdef mpz tmp
>> tmp = den/f.v[i]
>> vec[0][i] = f.v[i]*tmp
>>
>> or something like that and leave it to Cython to call the correct
>> methods. I don't like the fact that Cython would have to be gmp aware
>> --- maybe there is some way to just implement a cdef class mpz that
>> would support __add__, __mull__ and things like that, so as to behave
>> just like python integer, but still be as fast as the explicit code
>> above.
>
> Yep. Operator overloading using inline cdef functions should be a very
> non-controversial feature to add to Cython, and not very difficult  
> to add
> either (transform from eg. BinopNode to SimpleCallNode in the right
> circumstances), and that would solve this problem in a much more  
> generic
> way. At first that would require one to create a "cdef class" wrapper
> class containing the struct as a member and the overloaded  
> operators, but
> when that is all working one could discuss allowing such overloads in
> structs as well?

Yes, this has been on my want-to-do list for a long time. In fact,  
I've been thinking about this in terms of adding support for native  
(double) complex types. One question is weather/how to handle memory  
allocation if we implemented gmp integers in a more native way.

- Robert