Robert Kern wrote:
> On Wed, Apr 6, 2016 at 2:18 PM, Neal Becker <ndbeck...@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
I don't see how pycapsule helps here. What I need is, my C++ code receives
a RandomState object. I need to call e.g., rk_random, passing the pointer
to rk_state - code looks like this;
RandomState* r = (RandomState*)(rs.ptr());
// result_type buffer;
// rk_fill ((void*)&buffer, sizeof(buffer), r->internal_state);
if (sizeof(result_type) == sizeof (uint64_t))
return rk_ulong (r->internal_state);
else if (sizeof(result_type) == sizeof (uint32_t))
return rk_random (r->internal_state);
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