Division assignment operator (/=) is not exported properly to Python3
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 30/100
Research direction
The minimal reproduction is foo.cpp; start by compiling it with the stated Boost and Python 3 setup and inspect how exporting Foo::operator/= maps to idiv versus itruediv. Done means Python 3 invokes the correct in-place true-division method without a runtime crash, while Python 2 behavior remains unchanged.
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Description
The minimal example I have is for g++8.3.0 and boost1.67 on Ubuntu19.04 (although I have tested boost1.74 on a CentOS7.8 platform).
My understanding of the issue is that when the operator "/=" is exported for Python3, it is binded to __idiv__ and not __itruediv__, therefore causing a crash upon runtime. For Python2, there is no problem observed.
The problem solved by explicitly doing .def("__itruediv__", &Foo::operator/=). Is this a desired behaviour?
PS:
Compiling on Ubuntu19.04 as:
g++ foo.cpp -Wall -Wextra -shared -fPIC -o myModule.so -Wfatal-errors -I/usr/include/python3.7 -lboost_python3 (boost1.67 library and boost1.67-dev installed from packages).
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