Extend array types using where clause in Swift

Question

I\'d like to use the Accelerate framework to extend [Float] and [Double] but each of these requires a different implementation.

I tried the obvious:

Answer 1

If you want to extend only array with specific type. You should extend _ArrayType protocol.

extension _ArrayType where Generator.Element == Int {

   func doSomething() {
       ... 
   }
}

If you extend Array you can only make sure your element is conformed some protocol else. i.e:

extension Array where Element: Equatable {

   func doSomething() {
       ... 
   }
}

Updated: With Swift 3.1 https://github.com/apple/swift/blob/master/CHANGELOG.md

extension Array where Element == Int {

   func doSomething() {
       ... 
   }
}