Function process

include/pybind11/cast.h:2291–2305

    }

private:
    // normal argument, possibly needing conversion
    template <typename T>
    void process(list & /*names_list*/, T &&x) {
        handle h = detail::make_caster<T>::cast(std::forward<T>(x), policy, {});
        if (!h) {
#if !defined(PYBIND11_DETAILED_ERROR_MESSAGES)
            throw cast_error_unable_to_convert_call_arg(std::to_string(m_args.size() - 1));
#else
            throw cast_error_unable_to_convert_call_arg(std::to_string(m_args.size() - 1),
                                                        type_id<T>());
#endif
        }
        m_args.push_back_steal(h.ptr()); // cast returns a new reference
    }

    // * unpacking
    void process(list & /*names_list*/, detail::args_proxy ap) {