[pypy-dev] cffi python long

[Armin Rigo]

Hi Nathan,

On Fri, Nov 8, 2013 at 4:35 PM, Amaury Forgeot d'Arc <amauryfa at gmail.com> wrote:
>> Is there a nicer way to pass python long ints (bigint) into C
>> efficiently?

It depends what the C code wants to do with it.  If it's just for
passing around, you can use ffi.from_handle().  If the C code expects
to read the value, then I fear you need to decompose it into some
format, either manually or using hex() or marshal.  The internal
format of longs in PyPy is not directly accessible: it is not using
64-bit integers, but 63-bit if the C compiler supports __int128_t and
31-bit otherwise.


A bientôt,

Armin.