Hi, I'm converting SWIG typemap'ed C extensions from numarray to numpy. I studied (and use parts of) numpy.i from the doc directory. I noticed that there is no decref for the TYPEMAP_INPLACE2 typemap. This uses a function obj_to_array_no_conversion() which in turn just returns the original PyObject* ( casted to a PyArrayObject* after some sanity checks) It looks to me that in this case there should be an explicit Py_INCREF() - in case the function is threaded (releases the Python GIL) since it holds a pointer to that object's data .

(Alternatively) Travis suggested (at the http://www.scipy.org/Converting_from_numarray wiki page) using PyArray_FromAny - is this incrementing the ref.count (implicitely) ? The numarray equivalent (NA_InputArray) IS incrementing the ref.count (as far as I know...). Furthermore on that same wiki page the PyArray_FromAny() is called together with PyArray_DescrFromType(<type>). After searching through the numpy source I found that in blasdot/_dotblas.c (in dotblas_matrixproduct() )there is an explicit Py_INCREF even on the dtype returned from PyArray_DescrFromType. I would argue that ref.counting is always very tricky territory ;-) Hopefully someone can enlighten me . Thanks, Sebastian Haase ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion