On Fri, 17 Jan 2020, ToddAndMargo via perl6-users wrote: > Hi All, > > https://docs.raku.org/routine/+$CIRCUMFLEX_ACCENT > > (Operators) infix +^ยง > > multi sub infix:<+^>($a, $b --> Int:D) > > Integer bitwise XOR operator: Coerces both arguments to Int and does a > bitwise XOR (exclusive OR) operation. > > > $ p6 'my uint8 $x=0b0101_0111; my uint8 $y = 0b0000_1111; my uint8 $z = > +^($x, $y ); say "0", $x.base(2); say "0000", $y.base(2); say $z.base(2);' > > 01010111 > 00001111 > 11111101 > > > XOR > A B A xor B > 0 0 0 > 1 0 1 > 0 1 1 > 1 1 0 > > That s not what I am seeing above. > > What am I doing wrong this time? > > And who set the high bit making $z negative? >
As was already mentioned, if you want to use the &infix:<+^> operator, you have to either call it by its full name as a sub: &infix:<+^>($x, $y) or you have to use it according to its syntax category, as an infix: $x +^ $y When you write +^($x,$y), its cousin &prefix:<+^> is called instead, because now you use +^ as a prefix operator. That one performs bitwise negation on its argument coerced to Int, and since you pass it a list of length two, you actually evaluate +^2. And that's how you get the high bit and a value of -3. Regards, Tobias -- "There's an old saying: Don't change anything... ever!" -- Mr. Monk
