Function TEST_SUBMODULE

tests/test_pickling.cpp:60–191

} // namespace exercise_trampoline

TEST_SUBMODULE(pickling, m) {
    m.def("simple_callable", []() { return 20220426; });

    // test_roundtrip
    class Pickleable {
    public:
        explicit Pickleable(const std::string &value) : m_value(value) {}
        const std::string &value() const { return m_value; }

        void setExtra1(int extra1) { m_extra1 = extra1; }
        void setExtra2(int extra2) { m_extra2 = extra2; }
        int extra1() const { return m_extra1; }
        int extra2() const { return m_extra2; }

    private:
        std::string m_value;
        int m_extra1 = 0;
        int m_extra2 = 0;
    };

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

    py::class_<Pickleable> pyPickleable(m, "Pickleable");
    pyPickleable.def(py::init<std::string>())
        .def("value", &Pickleable::value)
        .def("extra1", &Pickleable::extra1)
        .def("extra2", &Pickleable::extra2)
        .def("setExtra1", &Pickleable::setExtra1)
        .def("setExtra2", &Pickleable::setExtra2)
        // For details on the methods below, refer to
        // http://docs.python.org/3/library/pickle.html#pickling-class-instances
        .def("__getstate__", [](const Pickleable &p) {
            /* Return a tuple that fully encodes the state of the object */
            return py::make_tuple(p.value(), p.extra1(), p.extra2());
        });
    ignoreOldStyleInitWarnings([&pyPickleable]() {
        pyPickleable.def("__setstate__", [](Pickleable &p, const py::tuple &t) {
            if (t.size() != 3) {
                throw std::runtime_error("Invalid state!");
            }
            /* Invoke the constructor (need to use in-place version) */
            new (&p) Pickleable(t[0].cast<std::string>());

            /* Assign any additional state */
            p.setExtra1(t[1].cast<int>());
            p.setExtra2(t[2].cast<int>());
        });
    });

    py::class_<PickleableNew, Pickleable>(m, "PickleableNew")
        .def(py::init<std::string>())
        .def(py::pickle(
            [](const PickleableNew &p) {
                return py::make_tuple(p.value(), p.extra1(), p.extra2());
            },