Swift 3 extension with a floating point array

Question

I'm trying to extend an Array<Float> in Swift 3. The goal is to add a function and call a few self.append() statements in the body. Here's what I have so far:

extension Array where Element: FloatingPoint {

    mutating func test(a: Float) {
        self.append(a)
    }

}

I'm getting an error that append() needs a FloatingPoint, and that it cannot use Float. But doesn't the Float type conform to FloatingPoint? Btw in Swift 2.X, I extended _ArrayType which worked well. It seems to have disappeared in Swift 3, and the append() function is now in Array.

Qbyte · Accepted Answer · 2016-09-14 10:37:46Z

2

You can only append elements to the array of type Element:

extension Array where Element: FloatingPoint {

    mutating func test(a: Element) {
        self.append(a)
    }

}

Note: This extension extends all floating point arrays: [Double], [CGFloat], ...

answered Sep 14, 2016 at 10:37

Qbyte

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