On Jan 16, 2009, at 1:36 AM, Dag Sverre Seljebotn wrote:
> As I have to interface a lot with some Fortran code these days, and a
> full-fledged Cython<->Fortran-binding *may* come out of it (if I
> continue to manage using Cython for this task it would be a likely
> result in about a year, at least I structure my hacky scripts in that
> direction),
I know virtually nothing about Fortran, but this sure sounds cool and
I'm sure the number-crunching communities would really like it.
> I feel free to ask a somewhat tangential question:
>
> What is the best way of declaring Fortran types in C? I understand
> there
> is likely no perfect cross-platform solution here, but is the naive
> approach taken by f2py (C int == integer(4) == default Fortran
> integer)
> sufficient? Including libgfortran.h or similar is too compiler
> dependant
> and complicated (but I'd be willing to use a single header file with
> ifdefs for platforms and compilers, if anyone have such a thing...)
>
> Looking to a Cython binding, I think there would be a seperate type
> hierarchy for Fortran types ("cython.fortran.real8" etc.), using
> Fortran
> specific typedefs in C. Furthermore it would be very sweet to
> automatically be able to pass Python buffer objects as F90 assumed-
> shape
> arrays :-) (I think a Fortran wrapper module would then have to be
> generated, as there's no consistent ABI for those. The same goes for
> strings.).
I would follow whatever conventions are followed for C-Fortran
interfaces, if that makes any sense.
- Robert
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