Kuidas piirata meetodi sees generics-ide lubatud parameetritüüpe?

In Swift, to restrict the allowed types of parameters in generics within a method, the restriction syntax using protocols or classes is used via the where keyword or inheritance indication.

Example of restricting a parameter type to conform to the Equatable protocol:

func findIndex<T: Equatable>(of valueToFind: T, in array: [T]) -> Int? {
    for (index, value) in array.enumerated() {
        if value == valueToFind {
            return index
        }
    }
    return nil
}

For a more complex restriction, where can be used:

func compareItems<T, U>(item1: T, item2: U) where T: Comparable, T == U {
    if item1 < item2 {
        print("item1 is less than item2")
    }
}

Thus, restrictions allow the compiler to verify that parameter types meet the specified requirements, increasing code safety and predictability.