C++ to ruby and python: passing a Swig ruby object to a python function

Hi all,

I have a weird case, but I expose my C++ classes to both ruby and Python.
We have a ruby "utility" gem that does a lot of things, and we do not to
rewrite it. But we like to be able to plug some python code. We have
"Measure" classes that derive from C++ that are being evaluated via their
`run` method by that ruby gem. We'd like to have Python Measure that could
be called via the gem too.

Essentially,* I'm trying to pass a ruby wrapper object to a python function
that expects a (python) wrapper and failing*. I'm currently trying to use
PyCall to instantiate that. So far, aside from finding a workaround way to
serialize my ruby object to a string and recreate a python one from that
string, I'm coming kinda empty. (In my actual project, none of the
arguments expected are easily serializable and use a couple dozen classes
as private members...)

*Does anyone have guidance on how I could achieve this? Somehow get the
underlying C++ memory from the ruby type to create the python type or
something?*


*I've created a Minimum Complete and Verifiable Example (MCVE) project to
illustrate my problem. More information can be found in the README*:
https://github.com/jmarrec/Cpp_Swig_Ruby_Python_MCVE

Bottom line, what I'm failing to do this is:
https://github.com/jmarrec/Cpp_Swig_Ruby_Python_MCVE/blob/master/ruby/test_pycall_workaround.rb#L44-L54

Thanks in advance for any pointers,
--
Julien Marrec, EBCP, BPI MFBA
Owner at EffiBEM <http://www.effibem.com>
T: +33 6 95 14 42 13

LinkedIn (en <https://www.linkedin.com/in/julienmarrec>) *| *(fr
<https://fr.linkedin.com/in/julienmarrec/fr>) :
<http://www.linkedin.com/in/julienmarrec>

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