使用pybind11在c ++中调用python时如何通过引用传递参数

Question

I'm using PyBind11 to run a Python interpreter, and I need to call a Python function in c++ with some pointer arguments.

According to the docs of pybind11, it looks like that a argument being passed to Python side should be freed normally by the Python interpreter, instead of the c++ main program. But this time the argument is a pointer to a static object, it should NOT be freed by anyone. How to code such a binding/calling?

I know that pybind11::return_value_policy::reference can be used to prevent a returning result from being freed, but it is for a returning object, not for arguments.

Any hint will be appreciated!

Answer 1

You can define a python wrapper inside an embedded module and access it from inside the python code. Then you can specify an appropriate return value policy when defining the getter.

Then either call the getter directly from the python code, or, if you still want to use pass it as an argument, call the getter separately and store the result as a py::object which you can pass as an argument.