A type with values that support addition and subtraction.

    protocol AdditiveArithmetic : Equatable


    The AdditiveArithmetic protocol provides a suitable basis for additive arithmetic on scalar values, such as integers and floating-point numbers, or vectors. You can write generic methods that operate on any numeric type in the standard library by using the AdditiveArithmetic protocol as a generic constraint.

    The following code declares a method that calculates the total of any sequence with AdditiveArithmetic elements.

    extension Sequence where Element: AdditiveArithmetic {
        func sum() -> Element {
            return reduce(.zero, +)

    The sum() method is now available on any sequence with values that conform to AdditiveArithmetic, whether it is an array of Double or a range of Int.

    let arraySum = [1.1, 2.2, 3.3, 4.4, 5.5].sum()
    // arraySum == 16.5
    let rangeSum = (1..<10).sum()
    // rangeSum == 45

    Conforming to the AdditiveArithmetic Protocol

    To add AdditiveArithmetic protocol conformance to your own custom type, implement the required operators, and provide a static zero property.


    Type Properties

    Type Operators


    Instance Methods


      Type Operators