specialized subclass of generic superclass

generics_in_swift_2.swift

import Foundation

struct Something {}

class Base<T> {
  let something: T

  init(something: T) {
    self.something = something
  }
}

class Sub: Base<Something> {
  // whatever 'Sub' does
}

let instance = Sub(something: Something()) // 'Sub' cannot be constructed because it has no accessible initializers

struct Something {}

class Base {
let something: T

init(something: T) {
    self.something = something
}

}

class Sub: Base {
override init(something: Something) {
super.init(something: something)
}
// whatever 'Sub' does
}

let instance = Sub(something: Something())