通过 LLDB 进一步调查发现这个协议有一些隐藏的要求

通过 LLDB 进一步调查发现这个协议有一些隐藏的要求。

(lldb) type lookup ErrorType
protocol ErrorType {
  var _domain: Swift.String { get }
  var _code: Swift.Int { get }
}
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这样一来 NSError 满足这个定义的原因就很明白了：它有这些属性，在 ivars 的支持下，不用动态查找就可以被 Swift 访问。还有一点不明白的是为什么 Swift 的一等公民（first class）枚举可以自动满足这个协议。也许其内部仍然存在一些魔法？

如果我们用我们新获得的知识再去实现结构体和类，一切就OK了。

struct MyErrorStruct : ErrorType {
  let _domain: String
  let _code: Int
}

class MyErrorClass : ErrorType {
  let _domain: String
  let _code: Int

  init(domain: String, code: Int) {
    _domain = domain
    _code = code
  }
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时间： 2024-10-25 14:05:45

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