ios - '(_, _, _) -> Void' is not convertible to 'Result<Post> -> Void' -

in view controller have code:

newpost!.save({ (post, error) in         //error here.           if let anerror = error {             print("error calling post on /posts")             print(anerror)             return         }         guard let post = post else {             print("error calling post on /posts: result nil")             return         }         // success!         print(post.description())         print(post.title)      }) 

i don't quite understand result<whatever> syntax, result should alamofire 2, post class created, result<post> -> void altogether mean , should change it?

update:

func save(completionhandler: (result<post>) -> void) {  let fields: [string: anyobject]? = self.tojson() if fields == nil {  print("error: error converting newpost fields json") return  } 

your completion handler definition , way have called different, try completion handler if want call way:

func save(completionhandler: (post:post?, error:string?) -> void) {      let fields: [string: anyobject]? = self.tojson()     if fields == nil {        completionhandler(nil, "error converting newpost fields json")        return     }     // rest of code, call completionhandler success } 

for swift 2:

func save(completionhandler: (post:post?, error:string?) -> void) {      guard let fields = self.tojson() else {          completionhandler(nil, "error converting newpost fields json")          return     }     // rest of code, call completionhandler success  } 

closures documentation