Custom exception types via builtin_exception?

[inducer]

Since there doesn't seem to be a mechanism for exposing custom exception types, so far I'm hackering around that by inheriting from builtin_exception and overriding set_error. (That at least compiles, haven't actually tested it yet.) On a scale of 1 to 5, how bad should I be feeling about that approach?

[wjakob]

The best thing would be to port pybind11's exception translators to nanobind. The basic infrastructure is already in place: the internals data structure defined in src/internals.{h/cpp} provides a field

    std::vector<void (*)(const std::exception_ptr &)> exception_translators;

which is exactly the same in pybind11. One would simply have to hook this up to "user" (i.e., developer) code so that extra translators can be appended to the list.

[inducer]

#71 has some drafty work in this direction.