On Fri, Oct 17, 2014 at 4:18 AM, Volker Braun <vbraun.n...@gmail.com> wrote:
> On Friday, October 17, 2014 11:02:53 AM UTC+1, Dima Pasechnik wrote:
>>
>> > cdef extern from "foo.h":
>> > int* vla_cast "(int (*)[])" (int*)
>> > int foo(int n, int* a)
>
> Hmm, and what should be in foo.h ?
>
>
> The header of your external C99 code that you want to call. I.e. only the
> "foo" function declaration is in the header.
>
> The vla_cast function is fake, and not in the foo.h header. We tell Cython
> that there is a vla_cast and that it takes int* to int*, so Cython thinks
> that it is ok to compose foo(3, vla_cast(data)). But in the generated C
> file, Cython will write "(int (*)[])" instead of "vla_cast".
>
>
> It seems that a C typedef for int (*)[] is not possible.
>>
>
> Yes, I forgot that the ctypedef also emits the C typedef so we can't use
> it just for a Cython typecast.
>
> cdef extern from *:
ctypedef int* int_array_ptr "int (*)[]"
That'll work for a cast, but not for a type declaration.
- Robert
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