Swift: 初始化器中的自身具有类型 (T) -> () -> T

Question

TL;DR:

NSObject 的 self 变量如何获取类型 (T) -> () -> T？

备注

我明白了为什么使用self这种方式是不合法的。但我正在尝试理解第二条错误消息。

代码

struct DummyStorer {
    let dummy: Dummy
}

struct Dummy {
    let storer = DummyStorer(dummy: self)
    // Use of unresolved identifier 'self'
    // OK, that's reasonable. But...
}

class Dummy : NSObject {
    let storer = DummyStorer(dummy: self)
    // Cannot convert value of type '(Dummy) -> () -> Dummy' to expected argument type 'Dummy'
    // ... how does the compiler arrive at this?
}

Answer 1

它是 NSObjectProtocol

的一部分

public protocol NSObjectProtocol {


    func isEqual(_ object: Any?) -> Bool

    var hash: Int { get }


    var superclass: AnyClass? { get }


    func `self`() -> Self         // << here !!

Swift: 初始化器中的自身具有类型 (T) -> () -> T

Swift: self in initializer has type (T) -> () -> T

types

initialization

swift