On 07/18/2012 01:55 PM, Jim Rees wrote:
> Dave Jones wrote:
>
>
> Unsigned long isn't necessarily 32 bits.
> On 64-bit systems %lu can be up to 18446744073709551615
>
> Thanks. You caught me thinking "Intel." How embarrassing.
What? why even on Intel-64 long is 64bit. long is always the
same or bigger then a pointer (A pointer must always fit
in a long)
On the other hand int is 32bit in Intel-64 unlike some
other CPUs where int(s) may get to be 64bit as well.
Cheers
Boaz
> ...
> long is always the same or bigger then a pointer
> (A pointer must always fit in a long)
> ...
Linux may make that assumption, but it doesn't have
to be true. 64bit windows still has 32bit long.
C99 inttypes.h defines [u]intptr_t to be an integral type
that is large enough to hold a pointer to any data item.
(That in itself is problematic for implementations that
encode multiple characters into a machine word and need
to use 'fat' pointers in order to encode the offset.)
David
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