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An example of Extension based on RxSwift in Swift.
public struct Extension<Base> {
public let base: Base
public init(_ base: Base) {
self.base = base
}
}
public protocol ExtensionCompatible {
associatedtype Compatible
var ex: Extension<Compatible> { get set }
static var ex: Extension<Compatible>.Type { get set }
}
public extension ExtensionCompatible {
public var ex: Extension<Self> {
get {
return Extension(self)
}
set {
// this enables using Extension to "mutate" base object
}
}
public static var ex: Extension<Self>.Type {
get {
return Extension<Self>.self
}
set {
// this enables using Extension to "mutate" base type
}
}
}
/// Int Extension
extension Int: ExtensionCompatible { }
public extension Extension where Base == Int {
public var cube: Int {
return base * base * base
}
public static var almostMax: Int {
return Int.max - 1
}
}
4.ex.cube // 64
Int.ex.almostMax // 9223372036854775806
/// String Extension
extension String: ExtensionCompatible { }
public extension Extension where Base == String {
public var reversed: String {
return String(base.characters.reversed())
}
public static func greet(to name: String) -> String {
return "Hi, \(name)."
}
}
"hello".ex.reversed // olleh
String.ex.greet(to: "Michael") // Hi, Michael.
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