Method cpp_function

include/pybind11/pytypes.h:2360–2366

public:
    PYBIND11_OBJECT_DEFAULT(function, object, PyCallable_Check)
    handle cpp_function() const {
        handle fun = detail::get_function(m_ptr);
        if (fun && PyCFunction_Check(fun.ptr())) {
            return fun;
        }
        return handle();
    }
    bool is_cpp_function() const { return (bool) cpp_function(); }
};