Interop between 2 nanobind modules

[jjcasmar]

I have a library A which is designed to be extensible via templates. This library A also expose some of its core functionality to python using nanobind.

Now I am writing a library B which is based on A, and it uses some of the core functionalities in A. I am also exposing B to python using nanobind.

Is it possible to pass objects from libA module to libB module?

[wjakob]

Yes.

[jjcasmar]

Do I need to do anything special?
Or can B::foo receive an A::object?

in module A

nb.class_<A::obj>(ma, "obj");

in module B

mb.def("foo", [](A::obj ao) {};);

import mb
import ma
mb.foo(ma.obj)

[wjakob]

This should just work fine. Such a case is even included in the test suite.

[jjcasmar]

Just a final question, if libA exposes an type to python, can I return that same type from libB?

in module A

nb.class_<A::obj>(ma, "obj");

in module B

mb.def("foo", []() {return A::obj{}};);

I tried to do something like that, but nanobind complains in python side that A::obj its not exposed to python (from B). Is there any way to achieve this?