Re: [Swig-user] typemaps problem (C++/Python)

[wim <wi...@te...>]

Hi,

I've posted a different, minimal example of my problem on StackOverflow:
http://tinyurl.com/lt4fx8v

Thanks for any help!


On 02/20/2014 02:21 PM, wim wrote:
> Hi all,
>
> I'm having problems with customs typemaps. Basically I don't know what
> typemaps should be defined for a given wrapped C++ class, in order to be
> able to iterate over the vector in Python ("for item in myVector: ...").
>
> If I do "for i in xrange(len(myVector)): print(myVector[i])" then there
> is no problem. But iterators don't work.
>
> I've written a fairly comprehensive piece of test code that shows the
> problem, it's all at http://tinyurl.com/nys333f
>
> The test code defines a "Variant" in C++, that can take multiple data
> types (primitive ones such as bool and int, and custom ones such as
> Fraction): see "variant.h".
> The code is wrapped by "test.i", which uses "conversions.h" for
> converting a Variant <-> PyObject.
> When running a test ("play.py"), it's easy to see that iterators in
> Python are not wrapped (see "console output").
> Even when I define a whole bunch of other typemaps ("more_typemaps.i"),
> the output remains the same.
>
> So my questions are:
>    - What typemap(s) do I have to define, in order for the iterators to
> work in Python?
>    - Is my approach of creating helper functions ("check()",
> "convertPyToCpp()", "convertCppToPy()") a reasonable thing to do?
> Obviously the point of these functions is to reuse some code when
> creating for instance "out" and "argout" typemaps.
>    - Does my approach of calling "convertCppToPy()" with "$owner"
> prevents memory leaks?
>    - Can my code be simplified? Do I really have to deal with things like
> "SWIG_ConvertPtr" and "SWIG_NewPointerObj", or can I avoid them in some way?
>
> Sorry for the lengthy example, but it addresses some problems that I
> have spent many many hours on, and I just don't see a solution.
>
> Thanks a lot in advance!
>
> Wim
>
> ------------------------------------------------------------------------------
> Managing the Performance of Cloud-Based Applications
> Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
> Read the Whitepaper.
> http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk
> _______________________________________________
> Swig-user mailing list
> Swi...@li...
> https://lists.sourceforge.net/lists/listinfo/swig-user
>