Haven't been following this thread, so I don't know what the context is
here, but the brain teaser caught my eye.
On Tue, 2009-05-19 at 08:20 -0400, Jens Kilian wrote:
> Junio C Hamano <gitster <at> pobox.com> writes:
> > "Ugly" is not quite the word I am looking for. "My gut feels that there
> > has to be a way to write this more cleanly, but I am frustrated that I
> > cannot come up with one" might be the word...
>
> How about this:
>
> #include <stdio.h>
>
-#define MAGIC(type) ((~(type)0 / (type)0xff) << 7)
+#define MAGIC(type) ((type)(~(type)0 / 0xffU << 7))
> #define TEST(type) printf(#type " %llx\n", (unsigned long long)MAGIC(type))
>
> int
> main(void)
> {
> /*TEST(unsigned char); Doesn't work, and I'm too lazy to find out why. */
> TEST(unsigned int);
> TEST(unsigned long);
> TEST(unsigned long long);
> return 0;
> }
>
--John
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