code: def ordd(item, inset):
      
      assert isinstance(inset, stypes.SpiceCell)
      assert inset.is_double()
      item = ctypes.c_double(item)
      return libspice.ordd_c(item, ctypes.byref(inset))
docs: The function returns the ordinal position of any given item in a
      double precision set.  If the item does not appear in the set, the
      function returns -1.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/ordd_c.html
  
      :param item: An item to locate within a set.
      :type item: float
      :param inset: A set to search for a given item.
      :type inset: SpiceDoubleCell
      :return: the ordinal position of item within the set
      :rtype: int