Class PickleableNew

tests/test_pickling.cpp:80–83

    };

    class PickleableNew : public Pickleable {
    public:
        using Pickleable::Pickleable;
    };

    py::class_<Pickleable> pyPickleable(m, "Pickleable");
    pyPickleable.def(py::init<std::string>())