Re: Array return argument with typemaps

On Thu, 4 Jun 2020 at 18:02, Alberto Luaces <[email protected]>
wrote:

> Hello,
>
> I am wrapping a function that receives a pointer to class, double
> parameter and writes the computation to an array:
>
> extern "C" void interp5C(spline *stat, double G, double *f);
>
> The input arguments are working well.  The "stat" object holds the size
> of the system and thus the size that "f" should have.
>
>
This is a complex API because the type information is split over more than
one C type and there is an unrelated parameter (double G) splitting the two
associated C types. If your api insted contained related types next to each
other like this:

extern "C" void interp5C(spline *stat, double *f, double G);

Then you could write multi-argument typemaps for (spline *stat, double *f)
with access to both parameters in the one typemap.


> and this works, but I am not entirely convinced with this, because I am
> accessing "arg1" directly to refer to "stat", which I think it is not
> very clean.
>
> Correct.

Your marshalling seems complex too with a Matrix class and dim_vector class
which I don't follow. I'd be tempted to write a simple C/C++ function
wrapper with all this code in instead.

William

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