Swift Equatable

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判断两个实例的值、或者实例是否相等，必须遵循 Equatable 协议

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class IntegerRef: Equatable {
  let value: Int
  init(_ value: Int) {
    self.value = value
  }

  static func == (lhs: IntegerRef, rhs: IntegerRef) -> Bool {
    return lhs.value == rhs.value
  }
}

let a = IntegerRef(100)
let b = IntegerRef(100)

print(a == a, a == b, separator: ", ")
// Prints "true, true"

let c = a
print(a === c, b === c, separator: ", ")
// Prints "true, false"