[Guido]
> ...
> Actually, C is fairly careful: AFAIK on a 32-bit machine the type of
> 0xffffffff is unsigned long,
Close: it's unsigned int.
> so it's not strictly -1,
Not close: it's nothing at all like -1! Try this:
#include <stdio.h>
void main() {printf("%d\n", 5 / 0xffffffff);}
If it "acted like" -1 this would print -5 instead of 0 (and if it doesn't
print 0, your compiler is broken). Maybe more obvious is to do
printf("%g\n", (double)0xffffffff);
That should pring something close to <wink>
4.29497e+09
not
-1
> and you'll have to use a cast somewhere to be able to compare it
> to an int.
If you want it treated like -1, definitely, because it's not -1. If you
want it treated like 4294967295, then in the absence of an explict cast the
int you're comparing it to will get silently promoted to unsigned int too
(or with a warning msg, if your compiler is helpful).
>> uint8_t, uint16_t, uint32_t and uint64_t.
> Hm. This is a big deviation from tradition. Those types aren't
> currently used or defined.
Nor are they required to exist, not even in C99, where all the new "exact
size" typedefs are optional -- some boxes simply don't have these types.
Most Cray boxes don't have a two-byte type, for example, and some don't have
a 32-bit type.
> ...
> If you really prefer your proposal with specific sized types, perhaps
> you can show some coding example that would be easier using specific
> sizes rather than char/short/int/long/long long?
Since we can't promise to supply specific-sized types, let's cut that short.
You never need specific-sized types, and Python-Dev has had this argument
before. Whenever it's come up, the code that relied on specific-sized types
got simpler after making it portable. What you do need is a type *at least*
as big as the size you need in the end (and C99 has required typedefs for
that concept; Python could grow some too).
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