embedding python interpreter

[niyue]

pybind11 supports embedding Python interpreter into a C++ program (https://pybind11.readthedocs.io/en/stable/advanced/embedding.html), and I briefly read nanobind's documentation, and it seems not mentioned in the doc. I wonder if this is supported by nanobind, and if it is not supported, is it part of the roadmap for the future? Thanks.

[wjakob]

This feature is outside of the scope of this project for reasons of maintainability and performance, see this section of the documentation. You will need to maintain a forked version of nanobind yourself if you wish to add such functionality.

[keithlostracco]

@niyue if you already have an embedded interpreter and have some sort of global object you can add a getter to the object that retrieves a nanobind module you create. @wjakob no fork/modifications to nanobind! :)

After finding Python and nanobind in CMakelists.txt you can simply call:
nanobind_build_library(nanobind-static) or nanobind_build_library(nanobind) for a shared lib

Then once everything is building you just need to make a NB_MODULE the same as usual

NB_MODULE(my_module, m) {
    m.doc() = "My embedded module!!!";
}

NB_MODULE creates the PyInit function for the module of the form PyObject* PyInit_my_module();

which you can pass directly to a getter or cache it's returned value so it doesn't get recreated each time you get it.