<=> and obfuscation

[hammond at petrus.UUCP]

> > 	To exchange two items without an intermediate variable, try:
> > 
> > 	b ^= a ^= b ^= a
> 
> However, if a == b when you start out, you end up with a == 0 && b == 0.
> 
NO!, I just tried it on our compiler, if a!=0 && b!=0 && a==b then
after the suggested line the variables still have the same value.
>
> This also only works on integer style variables.

Good point.