Creation of PyTuple in C++ module crashes

Question

Having some trouble with this code. Trying to return a tuple of tuples (coordinates) from a C++ module Im writing. It looks right to me, the dirty list contains two Coords so len is 2, the x and y values of the items in the list are 0,0 and 0,1 respectively. First time Im attempting this so I might very well have misunderstood the docs or something. Any hints?

PyObject* getDirty()
{
 int len = dirty.size();
 PyObject* tuple = PyTuple_New(len);
 int count = 0;
 for (std::list<Coord>::iterator i = dirty.begin(); i != dirty.end(); ++i)
 {
  PyTuple_SET_ITEM(tuple, count, PyTuple_Pack(2, (*i).x, (*i).y));
  ++count;
 }
 return tuple;
}

Edit: Oh, forgot to mention, the actual crash is on the PyTuple_Set_ITEM line.

Answer 1

The arguments to PyTuple_Pack, after the first one, must be PyObject pointers.

You might want instead

Py_BuildValue("(ii)", (*i).x, (*i).y)

...assuming the coordinates are actually of type int.