[capi-sig] Getting Numbers in C

[Hrvoje Niksic]

> double PyNumber_AsDouble(PyObject * value)
> {
> 	if (PyFloat_Check(value) || PyInt_Check(value)) {
> 		return PyFloat_AsDouble(value);
> 	} else {
> 		PyObject *pyfloat;
> 		double d;
> 
> 		pyfloat = PyNumber_Float(value);
> 		d = PyNumber_AsDouble(pyfloat);

I assume this should be PyFloat_AsDouble?

> 		Py_XDECREF(pyfloat);
> 		return d;
> 	}
> }

What happens if PyNumber_Float raises an exception?  As far as I can
tell, PyNumber_AsDouble will result in a "bad argument" exception
being raised and will return -1, losing track of the original
exception in the process.

Come to think of it, error checking problems could very well be the
reason why the API doesn't provide a PyNumber_AsDouble.