How do I add two common values ​​in Swift?

I am trying to write a function to sum an array of numeric types. This is how I understood it:

protocol Numeric { }
extension Float: Numeric {}
extension Double: Numeric {}
extension Int: Numeric {}

func sum<T: Numeric >(array:Array<T>) -> T{
    var acc = 0.0
    for t:T in array{
        acc = acc + t
    }
    return acc
}

      

But I don't know how to define the behavior of the operator +

in the protocol Numeric

.

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2 answers


protocol Numeric {
    func +(lhs: Self, rhs: Self) -> Self
}

      

should be enough.



Source: http://natecook.com/blog/2014/08/generic-functions-for-incompatible-types/

+4


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I did it like this, but I was just trying to add two values ​​and not use an array, but thought it might help.



func addTwoValues<T:Numeric>(a: T, b: T) -> T {
return a + b
}
print("addTwoValuesInts = \(addTwoValues(a: 3, b: 4))")
print("addTwoValuesDoubles = \(addTwoValues(a: 3.5, b: 4.5))")

      

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