斯威夫特阵列扩展与结构和通用对象

Question

所以我有这样的代码：

struct Asset<T>: AssetProtocol{ 
    typealias AssetType = T 

    var parent: T! 
    var children: [T]! 
    init(parent: T, children: [T] = [T](),){ 
     self.parent = parent 
     self.children = children 
    } 
} 

protocol AssetProtocol{ 
    associatedtype AssetProtocolType 
    var parent: AssetProtocolType! { get } 
    var children: [AssetProtocolType]! { get } 
} 

extension Array where Element: AssetProtocol{ 
    fun getExtractParents() -> [<I’m not sure what type should be here the “T” doesn’t work>] { 
     // iterate here to get all the parents then return it. 
    } 
} 

有没有办法，我可以创造一个阵列扩展和里面的方法返回所有“父”是数组的方式？请注意，“父”的类型是通用的，如结构资产中所示。

Answer 1

所以我想我找到了答案。我不确定这是否正确或有效，但是它为我做了工作。

extension Array where Element: AssetProtocol{ 
    func extractParents() -> [Element.AssetProtocolType] { 
     var parents: [Element.AssetProtocolType] = [] 
     for element in self { 
      parents.append(element.parent) 
     } 

     return parents 
    } 
} 

我仍然开放的建议，如果有人会给...