Re: AW: typemaps for python lists (double,int) as function arguments

At 01:45 PM 1/31/03 +0000, Marcus Stojek wrote:
> In reality I am using the (double*, int size) solution right now. And I
> was just reading the chapter of the doc you referred to :-)

Well, great minds think alike :)

> In "real" reality my funcitons look like:
>
> calc(double*, int size, double*, int size, double*, int size)
>
> with the first two lists going in and the last storing the result.
> For other functions the number of in and out list changes and some
> additional parameters are passed in.
>
> So would you suggest writing a single typemap for each function, maybe
> using the parameter names explicitly? Or is there a smarter solution.

No, there's no need to write a typemap for each function. If you write one 
for (double*, int), it will be applied to each such couple of arguments in 
your functions.


> For the outgoing list I guess I have to use an (argout) typemap that will
> create Pythonlist for me.

Yes, I think so---even though I didn't have to wrap such functions myself, 
so I don't have first-hand experience.

> The only way I found for doing this is PyList_New and a PyList_Append 
> loop. Isn't that awfully slow?

Probably. It might help to use PyList_New(size) and 
PyList_SetItem(list,i,obj) instead of PyList_Append---this way you allocate 
just once.

Bye,
        Luigi

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