extension Array where Element 代码学习

var fieldNames: [String] {

let p = UnsafePointer<Int32>(self.pointer)

return Array(utf8Strings: relativePointer(base: p.advanced(by: 3), offset: self.pointer.pointee.fieldNames))

}

间接类型推断？！

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protocol UTF8Initializable {

init?(validatingUTF8: UnsafePointer<CChar>)

}

extension String : UTF8Initializable {}

extension Array where Element : UTF8Initializable {

init(utf8Strings: UnsafePointer<CChar>) {

var strings = [Element]()

var pointer = utf8Strings

while let string = Element(validatingUTF8: pointer) {

strings.append(string)

while pointer.pointee != 0 {

pointer.advance()

}

pointer.advance()

guard pointer.pointee != 0 else {

break

}

}

self = strings

}

}