pybind11_json with c++ class

[pybind]

pybind11_json with c++ class

[schramm]

Ha! I definitely need to learn python. thank you a lot!

[martinRenou]

Do you mind showing the code of the class? I don't see what's wrong with this code.

[schramm]

class myClass
{
public:
    void take_json(const nlohmann::json& json) {
        std::cout << "This function took an nlohmann::json instance as argument: " << json.dump() << std::endl;
    }
};

PYBIND11_MODULE(myModule, module)
{
        py::class_<myClass>(module, "myClass") // for inheritance, we must include the base class
        .def(py::init<>())
        .def("take_json", &myClass::take_json, "pass py::object to a C++ function that takes an nlohmann::json");
}

on python:

a=myModule.myClass
a.take_json({"a": 1})

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-97ad54179472> in <module>
      1 a=myModule.myClass
----> 2 a.take_json({"a": 1})

TypeError: take_json(): incompatible function arguments. The following argument types are supported:
    1. (self: myModule.myClass, arg0: json) -> None

Invoked with: {'a': 1}

[JohanMabille]

Looks like you forgot the parenthesis at the end of the first line of python