> On 4 Oct 2017, at 11:42, Mike Kluev via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> on Tue, 3 Oct 2017 11:00:33 -0600 Dave DeLong <sw...@davedelong.com
> <mailto:sw...@davedelong.com>>
> wrote:
>
> > Because, ideally, I’d love to be able to do:
> >
> > infix operator and: LogicalConjunctionPrecedence // or whatever the
> > precedence is called
> > func and(lhs: Bool, rhs: Bool) → Bool { return lhs && rhs }
> >
> > let truthyValue = true and false
>
> +1 (i like your thinking, even if it is unlikely to happen in swift)
>
> (noteworthy, your example used "RIGHTWARDS ARROW" (U+2192) instead of ->,
> whether on purpose or not.)
>
> speaking of &&, was it just a copy-paste from C or is there a more
> fundamental reason to use that instead of &? in C they had to use two
> different operators because of the implicit int <-> bool promotions, but in
> swift "true & false" vs "1 & 2" would have been distinguishable.
The difference between the & and && operators isn't to do with the implicit
conversions; it's to do with whether both sides of the expression are evaluated
or not.
false && system('rm -rf')
You really don't want to do that if both sides are executed ...
Alex
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