Re: [Swig-user] how to refer arguments in typemap?

[Changsheng J. <jia...@gm...>]

Thanks for you reply.

I am a newbie, sorry for the garrulous.

Using multi-arguments typemap, since the numinputs can only be 0 or 1, then
we have to packed all arguments in script language to a list. That's not
convenient.

For example, We have to write in script svd((mat, k)), not svd(mat, k).

Another problem of multi-arguments typemap is that there will be too many
typemaps, for every different parameter forms. small typemap can be flexible
combined, but multi-arguments typemap not.

                                                     Changsheng Jiang


On Fri, Feb 5, 2010 at 05:57, William S Fulton <ws...@fu...>wrote:

> Changsheng Jiang wrote:
>
>> Hi list,
>>
>> I am wrapping a function, which init resource and return according the
>> parameters, for example
>>
>> svd(int m, int n, int k, double *A, double *U, double *S, double *V);
>>
>> U, S, V is argout, and init-ed according m, n and k, i.e., U is of
>> size m*k, V is of size n*k, S is of size k.
>>
>> I have wrote
>>
>> %typemap(in,numinputs=0) double *U(PyObject *array = NULL) {
>>  npy_intp dims[1];
>>  dims[0] = arg1 * arg3;
>>  array = PyArray_SimpleNew(1, dims, NPY_DOUBLE);
>>  $1 = array_data(array);
>> }
>>
>> %typemap(argout) double *U {
>>  $result = SWIG_Python_AppendOutput($result, array$argnum);
>> }
>>
>> It does not work, for, arg1 and arg3(relative to m, k, respectively.)
>> are initialized after the insertion of the typemap(in) fragments.
>>
>> My question is as the subject: How to refer a parameters?
>>
>>
> You can't as a typemap is for a type or types for which it is declared.
> Typemaps are independent of other parameters in a method unless you use
> multi-argument typemaps where the linkage between the parameters is when
> they are adjacent to each other. See docs. You could try a multi-argument
> typemap for all 5 parameters.
>
> William
>