Could you translate this line of code to plain English?

Question

DogRider OP

Created Feb ’18

Replies 2

Boosts 0

Participants 3

protocol Container {

associatedtype Item

mutating func append(_ item: Item)

var count: Int { get }

subscript(i: Int) -> Item { get }

associatedtype Iterator: IteratorProtocol where Iterator.Element == Item

func makeIterator() -> Iterator

}

protocol ComparableContainer: Container where Item: Comparable { }

I'm having trouble understanding the last line of code. Does it mean "create ComparableContainer and make it conform to Container whose Item adopts Comparable" ?

Boost

Answer 1

KMT OP

Feb ’18

Quoting from The Swift Programming Language (Swift 4), that line "declares a ComparableContainer protocol which requires Item to conform to Comparable:"

0

Answer 2

QuinceyMorris OP

Feb ’18

Accepted Answer

It means:

"Create a different protocol called ComparableContainer which does everything that Container does, but requires that the associated type must conform to Comparable."

In other words, ComparableContainer defines a more restricted protocol than Container.

0