My Kingdom For ...

[bearophile]

Gregor Richards:
> Walter's argument against !in makes perfect sense, and nobody ever
> acknowledges that. 'in' is not a boolean operation, and it wouldn't be
> good for 'in' to return a pointer and '!in' to return a bool. That's
> just silly.

"in" and "!in" may return both bools.
Another solution is to think "in" as an operator, and "!in" as two operators, where ! negates the result of the precedent "in", where "in" returns a pointer. I don't see this as silly :-)

Bye,
bearophile