Cannot return object by value

[davideanastasia]

I am currently trying to write a wrapper for a simple C++ class. One of the function merges two objects (both const ref) and creates a third object.

Code that creates the function is here: https://github.com/davideanastasia/pyblossom/blob/master/src/bloomfilter.cxx#L46
While binding is defined here: https://github.com/davideanastasia/pyblossom/blob/master/src/bindings.cxx#L28

When I run the associated unit test (https://github.com/davideanastasia/pyblossom/blob/master/tests/test_bloomfilter.py#L27), I am getting this:

`
tests/test_bloomfilter.py::test_merge Fatal Python error: Aborted

Current thread 0x0000ffffb9569010 (most recent call first):
File "/usr/local/lib/python3.6/dist-packages/_pytest/python.py", line 183 in pytest_pyfunc_call
File "/usr/local/lib/python3.6/dist-packages/pluggy/_callers.py", line 39 in _multicall
File "/usr/local/lib/python3.6/dist-packages/pluggy/_manager.py", line 80 in _hookexec
File "/usr/local/lib/python3.6/dist-packages/pluggy/_hooks.py", line 265 in call
File "/usr/local/lib/python3.6/dist-packages/_pytest/python.py", line 1641 in runtest
File "/usr/local/lib/python3.6/dist-packages/_pytest/runner.py", line 162 in pytest_runtest_call
File "/usr/local/lib/python3.6/dist-packages/pluggy/_callers.py", line 39 in _multicall
File "/usr/local/lib/python3.6/dist-packages/pluggy/_manager.py", line 80 in _hookexec
File "/usr/local/lib/python3.6/dist-packages/pluggy/_hooks.py", line 265 in call
File "/usr/local/lib/python3.6/dist-packages/_pytest/runner.py", line 255 in
File "/usr/local/lib/python3.6/dist-packages/_pytest/runner.py", line 311 in from_call
File "/usr/local/lib/python3.6/dist-packages/_pytest/runner.py", line 255 in call_runtest_hook
File "/usr/local/lib/python3.6/dist-packages/_pytest/runner.py", line 215 in call_and_report
File "/usr/local/lib/python3.6/dist-packages/_pytest/runner.py", line 126 in runtestprotocol
File "/usr/local/lib/python3.6/dist-packages/_pytest/runner.py", line 109 in pytest_runtest_protocol
File "/usr/local/lib/python3.6/dist-packages/pluggy/_callers.py", line 39 in _multicall
File "/usr/local/lib/python3.6/dist-packages/pluggy/_manager.py", line 80 in _hookexec
File "/usr/local/lib/python3.6/dist-packages/pluggy/_hooks.py", line 265 in call
File "/usr/local/lib/python3.6/dist-packages/_pytest/main.py", line 348 in pytest_runtestloop
File "/usr/local/lib/python3.6/dist-packages/pluggy/_callers.py", line 39 in _multicall
File "/usr/local/lib/python3.6/dist-packages/pluggy/_manager.py", line 80 in _hookexec
File "/usr/local/lib/python3.6/dist-packages/pluggy/_hooks.py", line 265 in call
File "/usr/local/lib/python3.6/dist-packages/_pytest/main.py", line 323 in _main
File "/usr/local/lib/python3.6/dist-packages/_pytest/main.py", line 269 in wrap_session
File "/usr/local/lib/python3.6/dist-packages/_pytest/main.py", line 316 in pytest_cmdline_main
File "/usr/local/lib/python3.6/dist-packages/pluggy/_callers.py", line 39 in _multicall
File "/usr/local/lib/python3.6/dist-packages/pluggy/_manager.py", line 80 in _hookexec
File "/usr/local/lib/python3.6/dist-packages/pluggy/_hooks.py", line 265 in call
File "/usr/local/lib/python3.6/dist-packages/_pytest/config/init.py", line 163 in main
File "/usr/local/lib/python3.6/dist-packages/_pytest/config/init.py", line 185 in console_main
File "/usr/local/bin/pytest", line 11 in
Makefile:15: recipe for target 'test' failed
make: *** [test] Aborted
`

I have also tried to allocate the object on the heap and return a pointer, and the code passes the associated unit test without any error. It is still not clear to me how python manages the lifecycle of the C++ objects and whether it calls the destructor in the expected way.