Swift中的相互非可选引用循环

在某个游戏的模型中,你有一个Player类.每个玩家都有一个无主的让对手：玩家代表他们正在对抗的对手.这些总是成对创建,并且玩家必须始终拥有对手,因为它是非可选的.然而,这很难建模,因为一个玩家必须先创建另一个玩家,并且第一个玩家在创建第二个玩家之前不会有对手！

通过一些丑陋的黑客攻击,我想出了这个解决方案：

class Player {
    private static let placeholder: Player = Player(opponent: .placeholder,name: "")

    private init(opponent: Player,name: String) {
        self.opponent = opponent
        self.name = name
    }

    unowned var opponent: Player
    let name: String

    class func getPair(named names: (String,String)) -> (Player,Player) {
        let p1 = Player(opponent: .placeholder,name: names.0)
        let p2 = Player(opponent: p1,name: names.1)
        p1.opponent = p2
        return (p1,p2)
    }
}

let pair = Player.getPair(named:("P1","P2"))

print(pair.0.opponent.name)
print(pair.1.opponent.name)

哪个效果很好.但是,我无法将对手变成常数.一种解决方案是让对手成为没有集合的计算属性,由私有var支持,但我想避免这种情况.

我试图用Swift指针进行一些黑客攻击,并提出：

class func getPair(named names: (String,Player) {
    var p1 = Player(opponent: .placeholder,name: names.0 + "FAKE")
    let p2 = Player(opponent: p1,name: names.1)

    withUnsafeMutablePointer(to: &p1) {
        var trueP1 = Player(opponent: p2,name: names.0)
        $0.moveAssign(from: &trueP1,count: 1)
    }
    return (p1,p2)
}

但这给了一个段错误.此外,在使用lldb进行调试时,我们可以看到在初始化p1之后,我们有：

(lldb) p p1
(Player2.Player) $R3 = 0x0000000101004390 {
  opponent = 0x0000000100702940 {
    opponent = <uninitialized>
    name = ""
  }
  name = "P1FAKE"
}

但是在函数结束时,lldb显示了这个：

(lldb) p p1
(Player2.Player) $R5 = 0x00000001010062d0 {
  opponent = 0x00000001010062a0 {
    opponent = 0x0000000101004390 {
      opponent = 0x0000000100702940 {
        opponent = <uninitialized>
        name = ""
      }
      name = "P1FAKE"
    }
    name = "P2"
  }
  name = "P1"
}

(lldb) p p2
(Player2.Player) $R4 = 0x00000001010062a0 {
  opponent = 0x0000000101004390 {
    opponent = 0x0000000100702940 {
      opponent = <uninitialized>
      name = ""
    }
    name = "P1FAKE"
  }
  name = "P2"
}

因此p1正确指向p2,但p2仍指向旧p1.更重要的是,p1实际上改变了地址！

我的问题是双重的：

>是否有更清晰,更“快捷”的方式来创建这种相互非可选引用的结构？
>如果没有,我对Swift中的UnsafeMutablePointers之类的误解是什么使得上面的代码不起作用？