tos.push("Type Parameters")
println(tos.items)tos.push("Naming Type Parameters")
println(tos.items)When we run the above program using playground, we get the following result:
[Swift]
[Swift, Generics]
[Swift, Generics, Type Parameters]
[Swift, Generics, Type Parameters, Naming Type Parameters]Where Clauses
Type constraints enable the user to define requirements on the type parameters associated
with a generic function or type. For defining requirements for associated types 'where'
clauses are declared as part of type parameter list. 'where' keyword is placed immediately
after the list of type parameters followed by constraints of associated types, equality
relationships between types and associated types.
protocol Container {
typealias ItemType
mutating func append(item: ItemType)
var count: Int { get }
subscript(i: Int) -> ItemType { get }
}struct Stack<T>: Container {
// original Stack<T> implementation
var items = [T]()
mutating func push(item: T) {
items.append(item)
}mutating func pop() -> T {
return items.removeLast()
}