[SPAM: 3.000] [Pyrex] size_t and reference passing in 64-bit platforms

[Francesc Alted]

Hi Michael,

Thanks for your suggestion, but this does not even compile. The next code:

--
#  Ei!, emacs, this is -*-Python-*- mode

cdef extern from "stdlib.h":
  #ctypedef int size_t
  # The correct correspondence between size_t and a basic type is *long*
  # instead of int, because they are the same size even for 64-bit platforms
  #ctypedef long size_t
  ctypedef size_t

cdef extern from "test_c.h":
   size_t read_c(size_t *id)

def readC(size_t id):
    cdef size_t id2
    id2 = id
    return read_c(&id2)
--

gives:

$ pyrexc test.pyx
test.pyx:11:24: Pointer base type cannot be a Python object
test.pyx:16:18: Cannot take address of Python variable

It seems like if size_t defined in that way is similar to object, i.e.:

cdef extern from "stdlib.h":
    ctypedef size_t

whould be equivalent to

cdef extern from "stdlib.h":
    ctypedef object size_t

which is not what we want.

A Divendres 09 Gener 2004 23:43, vareu escriure:
> On Sat, 2004-01-10 at 02:32, Francesc Alted wrote:
> > As size_t is not exactly a primitive type, I mapped it to a "int" type,
> > like in:
> >
> > cdef extern from "stdlib.h":
> >   ctypedef int size_t
>
> Try
> 	cdef extern from "stdlib.h":
> 	    ctypedef size_t
>
> This does not declare what "size_t" is, it just states that it is
> declared externally, somewhere.  The code for declaring external
> structures is quite similar.
>
> Hope this helps,
>     Michael

-- 
Francesc Alted