On Feb 11, 2009, at 7:27 PM, Greg Ewing wrote:
> Robert Bradshaw wrote:
>> On Feb 11, 2009, at 12:47 PM, Lisandro Dalcin wrote:
>>
>>> cdef class A:
>>> cdef readonly Py_ssize_t n
>>
>> People used to be able to write "ctypedef unsigned
>> long size_t" and have it work.
>
> Only if size_t is actually the size of an unsigned
> long on the platform concerned, though. Otherwise
> the Python runtime's idea of the struct layout won't
> match what is actually there.
What I meant was to use size_t one would write
cdef extern from *:
ctypedef unsigned long size_t
which would work perfect as long as sizeof(unsigned long) == sizeof
(size_t), and would also usually work fine if the sizes were
different (if one never needed to pass to and from Python-land with a
value large enough to care (though of course this is a bug waiting to
happen)). Now that it's a builtin type, it broke the user being able
to declare it, and we had to make sure to continue to support all use-
cases.
- Robert
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