How to wrap C function taking int64_t?

[Jeff]

I'm trying to wrap a C library which has a number of functions which
take an int64_t parameter. This is a piece of my pxd file wrapping
the C library's header:

from stdio cimport *
from stdlib cimport *
from stdint cimport *

cdef extern from "ga.h":
void GA_Abs_value_patch64(int g_a, int64_t *lo, int64_t *hi)

But this produces errors such as "'int64_t' is not a type identifier"
and "undeclared name not builtin: int64_t".
I need this to work on 32- and 64-bit platforms, so... did I miss
something obvious? Thanks.

[Ken Watford]

Cython 0.12 doesn't have a stdint.pxd file, so unless you've defined
it somewhere you won't get any types out of it.

If you don't mind NumPy being one of your requirements, you can do:

from numpy cimport int64_t

[Lisandro Dalcin]

On 17 August 2010 15:14, Ken Watford <kwat...@gmail.com> wrote:
> Cython 0.12 doesn't have a stdint.pxd file, so unless you've defined
> it somewhere you won't get any types out of it.
>
> If you don't mind NumPy being one of your requirements, you can do:
>
> from numpy cimport int64_t
>

Please do not top-post...

> On Tue, Aug 17, 2010 at 2:03 PM, Jeff <jeff....@pnl.gov> wrote:
>> I'm trying to wrap a C library which has a number of functions which
>> take an int64_t parameter.  This is a piece of my pxd file wrapping
>> the C library's header:
>>
>> from stdio cimport *
>> from stdlib cimport *
>> from stdint cimport *
>>
>> cdef extern from "ga.h":
>>    void GA_Abs_value_patch64(int g_a, int64_t *lo, int64_t *hi)
>>
>> But this produces errors such as "'int64_t' is not a type identifier"
>> and "undeclared name not builtin: int64_t".
>> I need this to work on 32- and 64-bit platforms, so... did I miss
>> something obvious?  Thanks.
>

In cython-devel (to be released VERY soon) there is fairly good
support for C99 integrals:
http://hg.cython.org/cython-devel/file/tip/Cython/Includes/libc/stdint.pxd

So, you just need to write:

from libc.stdint cimport int64_t

--
Lisandro Dalcin
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[Ken Watford]

On Tue, Aug 17, 2010 at 2:31 PM, Lisandro Dalcin <dal...@gmail.com> wrote:
> On 17 August 2010 15:14, Ken Watford <kwat...@gmail.com> wrote:
>> Cython 0.12 doesn't have a stdint.pxd file, so unless you've defined
>> it somewhere you won't get any types out of it.
>>
>> If you don't mind NumPy being one of your requirements, you can do:
>>
>> from numpy cimport int64_t
>>
>
> Please do not top-post...

Sorry about that. My heuristic was:
if list is on Google Groups: top post
else: bottom post

Will have to pay more attention to that.

[Robert Bradshaw]

No problem, unless you've been on this list a while you wouldn't know.

As for the original question, you could also declare it directly, just
as we will in the next release:

cdef extern from "stdint.h":
ctypedef signed int int64_t

http://hg.cython.org/cython-devel/file/2bac73e04f8b/Cython/Includes/libc/stdint.pxd#l1

- Robert