Ok, I now have this:
cythonHash.pxd:
cdef extern from "hash-table.h":
ctypedef struct HashTable
ctypedef void *HashTableKey
ctypedef unsigned long HashTableHashFunc(HashTableKey value)
ctypedef unsigned long HashTableEqualFunc(HashTableKey value)
HashTable *hash_table_new(HashTableHashFunc hash_func,
HashTableEqualFunc equal_func)
cdef inline unsigned long c_hash_func(HashTableKey value):
return 1
cdef inline unsigned long c_hash_equal(HashTableKey value):
return 1
cythonPT.pyx:
cimport cythonHash
from cythonHash cimport HashTable
class MY_Phrase_Table(object):
def __init__(self):
pp = HashTable #error here
print type(pp), pp
This yields in the following error: 'HashTable' is not a constant, variable
or function identifier.
I don't really get how I should reference to Hashtable. I thought it was
already declared from .pxd and the original .c file.
-----Original Message-----
From: Stefan Behnel [mailto:[email protected]]
Sent: vrijdag 4 september 2009 16:03
To: [email protected]
Cc: [email protected]
Subject: Re: [Cython] FW: cython and hash tables / dictionary
Sanne Korzec wrote:
> In the documentation
>
http://c-algorithms.sourceforge.net/doc/hash-table_8h.html#e361c4c0256ec6c74
> 1ecfeabef33d891 , I can find:
>
> HashTable* hash_table_new ( HashTableHashFunc hash_func,
> HashTableEqualFunc equal_func
> )
>
> To create a new hash table. But I can't find were the HashTableHashFunc
and
> HashTableEqualFunc are declared. The only thing I can find is in the
header
> file which state:
>
> typedef unsigned long(* HashTableHashFunc)(HashTableKey value)
> typedef unsigned long(* HashTableHashFunc)(HashTableKey value)
>
> Does this mean I have to write these functions myself?
Yes.
> In c?
You can write them in Cython:
cdef unsigned long c_hash(HashTableKey value):
return huge_calculation_on(value)
> And how then do I call them from cython?
You don't. Instead, you pass the function names (i.e. pointers) into
hash_table_new().
> My guess:
>
> hashtable.pyx
"hashtable.pxd", I assume?
> cdef extern from "hash_table.h":
>
> object HashTable hash_table_new(object hash_func, object equal_func)
That won't work. You can't use Python functions as their signature won't
match the required signatures. Instead, define HashTable as a struct and
the functions as a ctypedef.
Stefan
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