What about having a protocol for having failable literal convertible
initializers for literal optionals?
struct AtLeast3<T> : FailableArrayLiteralConvertible {
...
init?(arrayLiteral elements: T...) {
guard elements.count >= 3 else { return nil }
...
}
}
var bar: AtLeast3? = [1, 2]? // bar is 'Optional<AtLeast3>.None'
bar = [1,2,3] // bar is 'Optional<AtLeast3>.Some([1,2,3])'
Seems handy for when your types are literal convertible in principle, but you
need to do some validation.
Thoughts?
- Dave Sweeris
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