[Cython] how would I wrap something like this in a .pxd file

[Chris Colbert]

Thanks Lisandro,

I may just end up declaring each struct like this with a 'pass'

and then implementing the fields on the python side (this is how ctypes does it)

Cheers!

On Wed, Jul 1, 2009 at 3:01 PM, Lisandro Dalcin<dalcinl at gmail.com> wrote:
> On Wed, Jul 1, 2009 at 3:24 PM, Chris Colbert<sccolbert at gmail.com> wrote:
>> i just saw this line in the docs:
>>
>> 6. If the header file defines a function using a macro, declare it as
>> though it were an ordinary function, with appropriate argument and
>> result types.
>>
>> So i'll start there.
>>
>> Sorry for the bogus post.
>>
>
> IMHO, your post was not bogus... Making Cython use such kind of macros
> (which resembles a C++ template emulation) can be not so easy...
> Perhaps the easiest way would be to define a helper struct (one of
> each node_type) in some C header, and then include it using cdef
> extern from "mydefs.h": ...
>
>
>>
>> On Wed, Jul 1, 2009 at 1:52 PM, Chris Colbert<sccolbert at gmail.com> wrote:
>>> In wrapping a C library, I come across many #define statements that I
>>> need to use elsewhere. When they simply define a constant, I use an
>>> anonymous enum and all is well.
>>>
>>> But how would I wrap something like this that shown up in a header
>>> file that i'm cdef extern'ing from:
>>>
>>> #define CV_TREE_NODE_FIELDS(node_type)                               \
>>>
>>>    int       flags;                \
>>>
>>>    int       header_size;          \
>>>
>>>    struct    node_type* h_prev;      \
>>>
>>>    struct    node_type* h_next;     \
>>>
>>>    struct    node_type* v_prev;       \
>>>
>>>    struct    node_type* v_next ;
>>>
>>>
>>> or something like this:
>>>
>>> #define CV_IS_STORAGE(storage)  \
>>>
>>>    ((storage) != NULL &&       \
>>>
>>>    (((CvMemStorage*)(storage))->signature & CV_MAGIC_MASK) ==
>>> CV_STORAGE_MAGIC_VAL)
>>>
>>>
>>>
>>>
>>> Thanks and Cheers!
>>>
>>> Chris
>>>
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>
>
>
> --
> Lisandro Dalcín
> ---------------
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