[英]How to use generics as params?(Swift 2.0)
Code in playground is here 操场上的代码就在这里
class ProductModel {
var productID : Int = 0
init(id:Int) {
productID = id
}
}
protocol GenericListProtocol {
typealias T = ProductModel
var list : [T] { get set }
var filteredlist : [T] { get set }
func setData(list : [T])
}
extension GenericListProtocol {
func setData(list: [T]) {
list.forEach { item in
guard let productItem = item as? ProductModel else {
return
}
print(productItem.productID)
}
}
}
class testProtocol {
class func myfunc<N:GenericListProtocol>(re:N){
var list : [ProductModel] = [ProductModel(id: 1),ProductModel(id: 2),ProductModel(id: 3),ProductModel(id: 4)]
re.setData(list)
}
}
But in the line re.setData(list)
但在行
re.setData(list)
get compile error: 得到编译错误:
Cannot convert value of type '[ProductModel]' to expected argument type '[_]'.
无法将'[ProductModel]'类型的值转换为预期的参数类型'[_]'。
My Question is How to use setData method in GenericListProtocol
? 我的问题是如何在
GenericListProtocol
使用setData方法?
Anyone could help will be appreciated. 任何人都可以提供帮助,我
Moving the ProductModel
type into the extension and removing the constraint from the generic protocol seems to work. 将
ProductModel
类型移动到扩展中并从通用协议中删除约束似乎可行。
class ProductModel {
var productID : Int = 0
init(id:Int) {
productID = id
}
}
protocol GenericListProtocol {
typealias T
var list : [T] { get set }
var filteredlist : [T] { get set }
func setData(list : [T])
}
extension GenericListProtocol {
func setData(list: [ProductModel]) {
list.forEach { item in
print(item.productID)
}
}
}
class testProtocol {
class func myfunc<N:GenericListProtocol>(re:N) {
let list : [ProductModel] = [ProductModel(id: 1),ProductModel(id: 2),ProductModel(id: 3),ProductModel(id: 4)]
re.setData(list)
}
}
I found this question interesting and thought how best we could solve it in generic way. 我发现这个问题很有意思,并认为我们如何以通用的方式解决它。
protocol Product {
var productID : Int {get set}
}
class ProductModel: Product {
var productID : Int = 0
init(id:Int) {
productID = id
}
}
protocol GenericListProtocol {
typealias T : Product
var list : [T] { get set }
var filteredlist : [T] { get set }
}
extension GenericListProtocol {
func setData(list: [T]) {
list.forEach { item in
print(item.productID)
}
}
}
class GenericListProtocolClass : GenericListProtocol
{
typealias T = ProductModel
var intVal = 0
var list = [T]()
var filteredlist = [T]()
}
class testProtocol {
class func myfunc(re: GenericListProtocolClass){
let list : [ProductModel] = [ProductModel(id: 1),ProductModel(id: 2),ProductModel(id: 3),ProductModel(id: 4)]
re.setData(list)
}
}
let temp = GenericListProtocolClass()
testProtocol.myfunc(temp)
Appreciate your thought and suggestion if it can be improved further. 如果可以进一步改进,请欣赏您的想法和建议。
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