casting on 64/32-bit environment

[Andrew Haley]

Miles Bader writes:
 > Holger Eitzenberger <holger@eitzenberger.org> writes:
 > >> Dose anyone have a reasonable explanation about that?
 > >
 > > make sure to use 'unsigned long' instead of 'unsigned int', as only the
 > > first one will be 64bit in a 64bit environment, the latter still will
 > > be 32bit.
 > 
 > You can't really assume this -- apparently on ms-windows "long" is
 > still 32 bit, even in a "64-bit" environment (stupid, I agree, but
 > I guess MS has too much badly written code that they don't want to
 > break...).

Indeed.  ptrdiff_t and size_t and intptr_t are the types to use,
depending on exactly what is wanted.

Andrew.