[swift-users] Using ... as a concrete type conforming to protocol ... is not supported

[Hooman Mehr]

> On Mar 25, 2016, at 2:51 PM, Jason Sadler via swift-users <swift-users at swift.org> wrote:
> 
> (My particular use case can be seen here: https://gist.github.com/sadlerjw/2cc16b4375b02fe7f400 <https://gist.github.com/sadlerjw/2cc16b4375b02fe7f400> … and the best information I’ve been able to find on this so far is here: http://stackoverflow.com/questions/33112559/protocol-doesnt-conform-to-itself/33524927#33524927 <http://stackoverflow.com/questions/33112559/protocol-doesnt-conform-to-itself/33524927#33524927>)

Here is the best you can do for your particular use case:

protocol AnyEquatable { func equals(other: Any) -> Bool }

func ==<T: Equatable>(lhs: T, rhs: Any) -> Bool {
    
    if let rhs = rhs as? T { return lhs == rhs } else { return false }
}

extension Bool:   AnyEquatable { func equals(other: Any) -> Bool { return self == other } }

extension Int:    AnyEquatable { func equals(other: Any) -> Bool { return self == other } }

extension Double: AnyEquatable { func equals(other: Any) -> Bool { return self == other } }

extension String: AnyEquatable { func equals(other: Any) -> Bool { return self == other } }

extension Array {
    
    func indexOfAny(element : AnyEquatable) -> Index? { return indexOf { element.equals($0) } }
}

var array: [Any] = [false, 1, 2.0, "three"]

array.indexOfAny(2.0)

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