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



source to share

2 answers

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


should be enough.




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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