protocol ExampleProtocol {
var simpleDescription: String { get }
mutating func adjust()
}
class SimpleClass: ExampleProtocol {
var simpleDescription: String = "A very simple class."
var anotherProperty: Int = 69105
func adjust() {
simpleDescription += " Now 100% adjusted."
}
}
var a = SimpleClass()
a.adjust()
let aDescription = a.simpleDescription
struct SimpleStructure: ExampleProtocol {
var simpleDescription: String = "A simple Structure"
mutating func adjust() {
simpleDescription += " (adjusted)"
}
}
var b = SimpleStructure()
b.adjust()
let bDescription = b.simpleDescription
print(aDescription)
print(bDescription)
extension Int: ExampleProtocol {
var simpleDescription: String {
return "The number \(self)"
}
mutating func adjust() {
self += 42
}
}
print(7.simpleDescription)
var num = 7
num.adjust()
print(num.simpleDescription)
protocol OneProtocol {
var simpleDescription: String { get }
mutating func absoluteValue()
}
extension Double: OneProtocol {
var simpleDescription: String {
return "The number \(self)"
}
mutating func absoluteValue() {
if self < 0 {
self = -self
}
}
}
var nume: Double = -9
print(nume.simpleDescription)
nume.absoluteValue()
print(nume.simpleDescription)
//let p: SimpleClass = a
//print(p.simpleDescription) --> print (lldb)
//print(p.anotherProperty) --> print (lldb)
let p: ExampleProtocol = a
print(p.simpleDescription)
//print(p.anotherProperty) --> erreur