[Numpy-discussion] mtrand.c update 1.11 breaks my crappy code

[Robert Kern]

On Wed, Apr 6, 2016 at 2:18 PM, Neal Becker <ndbecker2 at gmail.com> wrote:
>
> I have C++ code that tries to share the mtrand state.  It unfortunately
> depends on the layout of RandomState which used to be:
>
> struct __pyx_obj_6mtrand_RandomState {
>   PyObject_HEAD
>   rk_state *internal_state;
>   PyObject *lock;
> };
>
> But with 1.11 it's:
> struct __pyx_obj_6mtrand_RandomState {
>   PyObject_HEAD
>   struct __pyx_vtabstruct_6mtrand_RandomState *__pyx_vtab;
>   rk_state *internal_state;
>   PyObject *lock;
>   PyObject *state_address;
> };
>
> So
> 1. Why the change?
> 2. How can I write portable code?

There is no C API to RandomState at this time, stable, portable or
otherwise. It's all private implementation detail. If you would like a
stable and portable C API for RandomState, you will need to contribute one
using PyCapsules to expose the underlying rk_state* pointer.

https://docs.python.org/2.7/c-api/capsule.html

--
Robert Kern
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/numpy-discussion/attachments/20160406/e39d9fa1/attachment.html>