I have this function:

class myClass: ObservableObject {
    
    func doSomethingElse<T:Decodable>(url: URL,
                                      config: URLSessionConfiguration,
                                      type: T.Type) -> AnyPublisher<Int, any Error> {
        return URLSession(configuration:config).dataTaskPublisher(for: url)
            .tryMap{ response in
                guard let valueResponse = response.response as? HTTPURLResponse else {
                    return 000
                }
                return valueResponse.statusCode
            }.mapError{error in
                return error
            }
            .eraseToAnyPublisher()
    }
}

and it works just fine but I'm trying to add this function to URLSession extension:

extension URLSession {
    
    func doSomethingElse<T:Decodable>(url: URL,
                                      config: URLSessionConfiguration,
                                      type: T.Type) -> AnyPublisher<Int, any Error> {
       return self(configuration:config).dataTaskPublisher(for: url)
            .tryMap{ response in
                guard let valueResponse = response.response as? HTTPURLResponse else {
                    return 000
                }
                return valueResponse.statusCode
            }.mapError{error in
                return error
            }
            .eraseToAnyPublisher()
    }

But I'm getting this error:

Cannot call value of non-function type 'URLSession'

Any of you knows why I'm getting this error? or how can configure URLSession to have the configuration?

I'll really appreciate your help

CodePudding user response：

self is the specific instance of URLSession. You want Self, which is the type

Self(configuration:config)...

You may also want doSomethingElse to be a static function, since it doesn't actually reference the specific instance of self:

static func doSomethingElse<T:Decodable>(url: URL,
                                      config: URLSessionConfiguration,
                                      type: T.Type) -> AnyPublisher<Int, any Error> {
        return Self(configuration:config).dataTaskPublisher(for: url)
            .tryMap{ response in
                guard let valueResponse = response.response as? HTTPURLResponse else {
                    return 000
                }
                return valueResponse.statusCode
            }.mapError{error in
                return error
            }
            .eraseToAnyPublisher()
    }

CodePudding user response：

Change

func doSomethingElse...{
   return self(configuration:...

To

static func doSomethingElse...{
   return Self(configuration:...

Call it as

URLSession.doSomethingElse...