Cython avoid PyObject and object convertion

[Feiyang]

Hi, thanks in advance for any help!

I have a cython function defined like below

cdef double foo(str arg1, double arg2) nogil:

    if arg1 == "bar":

        return 1.0

    else:

        return 0.0

In another function, I need to apply this function to a a structured object. Currently, the structured c object is and the other function is defined as follows:

cdef struct fooArgs:

    PyObject* arg1

    double arg2

cdef double wrapped_foo(fooArgs* args) nogil:

    return foo(args.arg1, args.arg2)

I use a PyObject pointer because a str cannot be part of a c struct. but when I try to compile this, I get error "Cannot convert PyObject * to python object."

However, I can see in the generated C code

static double __pyx_f_4test_foo(PyObject *__pyx_v_arg1, CYTHON_UNUSED double __pyx_v_arg2) {

  double __pyx_r;

  int __pyx_t_1;

  int __pyx_lineno = 0;

  const char *__pyx_filename = NULL;

  int __pyx_clineno = 0;

  #ifdef WITH_THREAD

  PyGILState_STATE __pyx_gilstate_save;

  #endif

that a PyObject * is being used to represent arg1.

How should I tweak the signature of fooArgs or implementation of wrapped_foo, so that wrapped_foo can take a c struct as an argument, and use foo on the content of the struct?