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

So I didn't read the question properly. FloatingPointType is an existing protocol that is implemented by Double, Float and CGFloat, so

Yes. I did it only yesterday to add a function to SequenceType where the elements had to be Equatable. This is a modification to restrict the elements to Float

You need to use a where clause. This is my function below.

public extension SequenceType where Self.Generator.Element: FloatingPointType
{
    public func splitAt(separator: Generator.Element) -> [[Generator.Element]]
    {
        var ret: [[Generator.Element]] = []
        var thisPart: [Generator.Element] = []

        for element in self
        {
            if element == separator
            {
                ret.append(thisPart)
                thisPart = []
            }
            else
            {
                thisPart.append(element)
            }
        }
        ret.append(thisPart)
        return ret
    }
}

[Float(1), Float(2), Float(3), Float(4)].splitAt(Float(2))
// returns [[1],[3, 4]]
[Double(1), Double(2), Double(3), Double(4)].splitAt(Double(3))
// returns [[1, 2],[4]]

NB I couldn't make this work for an array but SequenceType is more general anyway.