gridloop1 with SCXX

static PyObject* gridloop1(PyObject* self, PyObject* args_)
{
  /* arguments: a, xcoor, ycoor */
  try {
    PWOSequence args (args_);
    NumPyArray_Float a ((PyArrayObject*) ((PyObject*) args[0])); 
    NumPyArray_Float xcoor ((PyArrayObject*) ((PyObject*) args[1])); 
    NumPyArray_Float ycoor ((PyArrayObject*) ((PyObject*) args[2])); 
    PWOCallable func1 (args[3]);

    // work with a, xcoor, ycoor, and func1
    ...

    return PWONone();
  }
  catch (PWException e) { return e; }
}