Binary operator '+' cannot be applied to two 'T' operands

Question

I am using Generics to add different types like Int, Double, Float, etc. I used the code below but I\'m getting error \"Binary operator \'+\' cannot be applied to two \'T\'

Answer 1

In Swift 4 / Xcode 9+ you can take advantage of the Numeric protocol.

func add(num1: T, num2: T) -> T {
    return num1 + num2
}

print(add(num1: 3.7, num2: 44.9)) // 48.6
print(add(num1: 27, num2: 100))  // 127

Using this means you won't have to create a special protocol yourself.

This will only work in the cases where you need the functionality provided by the Numeric protocol. You may need to do something similar to @adam's answer for % and other operators, or you can leverage other protocols provided by Apple in the Xcode 9 SDK.