Method init

tests/mod_per_interpreter_gil_with_singleton.cpp:53–60

    std::vector<py::handle> &get_objects() { return objects; }

    static void init() {
        // Ensure the singleton is created
        auto &instance = get_instance();
        (void) instance; // suppress unused variable warning
        assert(instance.objects.size() == 7);
        // Register cleanup at interpreter exit
        py::module_::import("atexit").attr("register")(py::cpp_function(&MySingleton::clear));
    }

    static void clear() {
        auto &instance = get_instance();