[Numpy-discussion] fwrite() failure in PyArray_ToFile

Sturla Molden sturla@molden...
Fri Sep 4 23:29:36 CDT 2009


Charles R Harris skrev:
> The size of long depends on the compiler as well as the operating 
> system. On linux x86_64, IIRC, it is 64 bits, on Windows64 I believe 
> it is 32. Ints always seem to be 32 bits.
If I remember the C standard correctly, a long is guaranteed to be at 
least 32 bits, whereas an int is guaranteed to be at least 16 bits. A 
short is at least 16 bits and a long long is 64 bits. Then there is 
intptr_t which is wide enough to store a pointer, but could be wider. A 
size_t usually has the size of a pointer but not always (on segment and 
offset architectures they might differ). Considering PEP353, should we 
be indexing with Py_ssize_t instead of npy_intp? I believe (correct me 
if I'm wrong) npy_intp is typedef'ed to Py_intptr_t.

S.M.








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