所以我试过

var dict = Dictionary<Any,Int>()

和

var dict = Dictionary<AnyObject,Int>()

结果

error: type 'Any' does not conform to protocol 'Hashable'
var dict = Dictionary<Any,Int>()
           ^
<REPL>:5:12: error: cannot convert the expression's type '<<error type>>' to type '$T1'
var dict = Dictionary<Any,Int>()
           ^~~~~~~~~~~~~~~~~~~~~~

OK，我将使用Hashable

var dict = Dictionary<Hashable,Int>()

但

error: type 'Hashable' does not conform to protocol 'Equatable'
var dict = Dictionary<Hashable,Int>()
           ^
Swift.Equatable:2:8: note: '==' requirement refers to 'Self' type
  func ==(lhs: Self,rhs: Self) -> Bool
       ^
Swift.Hashable:1:10: note: type 'Hashable' does not conform to inherited protocol 'Equatable.Protocol'
protocol Hashable : Equatable
         ^
<REPL>:5:12: error: cannot convert the expression's type '<<error type>>' to type '$T1'
var dict = Dictionary<Hashable,Int>()
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~

所以Hashable继承自Equatable，但它不符合Equatable ???我不明白…

反正，不断尝试

typealias KeyType = protocol<Hashable,Equatable> // KeyType is both Hashable and Equatable
var dict = Dictionary<KeyType,Int>() // now you happy?

没有运气

error: type 'KeyType' does not conform to protocol 'Equatable'
var dict = Dictionary<KeyType,rhs: Self) -> Bool
       ^
Swift.Hashable:1:10: note: type 'KeyType' does not conform to inherited protocol 'Equatable.Protocol'
protocol Hashable : Equatable
         ^
<REPL>:6:12: error: cannot convert the expression's type '<<error type>>' to type '$T1'
var dict = Dictionary<KeyType,Int>()
           ^~~~~~~~~~~~~~~~~~~~~~~~~~

我现在这么迷路，我怎么能让编译器满意我的代码？

我想使用字典

var dict = Dictionary<Any,Int>()
dict[1] = 2
dict["key"] = 3
dict[SomeEnum.SomeValue] = 4

我知道我可以使用Dictionary< NSObject，Int&gt，但它不是我真正想要的。