ios - Swift Generics Inheritance -

i'm trying create utils make http request. want use :

    var callback = callback<loginresultbean>(onsuccess: { (data) -> () in          print("true");         }) { (error) -> () in             print("false");     }     var handler = connectionhandler<loginresultbean>(url : "https://.....", callback : callback); 

loginbeanresult can change other model want retrieve server.

but doesn't compile cause of error : 'connectionhandler' requires 'loginresultbean' inherit 'basemodel'

but loginbeanresult inherit basemodel don't understand error.

here class code :

//basemodel.swift import objectmapper import foundation  class basemodel : nsobject, mappable {      required init?(_ map: map) {      }      func mapping(map: map)     {      } } 

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//loginbeanresult.swift import objectmapper import foundation  class loginresultbean : basemodel {     var jeton : string?;     var etat : string?;     var muna : string?;     var idabo : string?;     var codepostal : string?;     var ville : string?;      override func mapping(map: map) {         super.mapping(map);          self.jeton <- map["jeton"];         self.etat <- map["etat"];         self.muna <- map["muna"];         self.idabo <- map["idabo"];         self.codepostal <- map["codepostal"];         self.ville <- map["ville"];     } } 

.

//connectionhandler.swift import objectmapper import foundation  class connectionhandler<t: basemodel> {      var url : string;     var callback : callback<t>;      init(url : string, callback : callback<t>)     {         self.url = url;         self.callback = callback;     }      func sendrequest(params : basemodel)     {         let jsondata = mapper().tojsonstring(params, prettyprint:false)?.datausingencoding(nsutf8stringencoding);          let postlength : string = string(jsondata!.length);          let request : nsmutableurlrequest = nsmutableurlrequest();         let session = nsurlsession.sharedsession();          request.url = nsurl(string: url);         request.httpmethod = "post";         request.setvalue(postlength, forhttpheaderfield: "content-length");         request.setvalue("application/json", forhttpheaderfield: "content-type");         request.httpbody = jsondata;          let task = session.datataskwithrequest(request, completionhandler: {data, response, error -> void in              let response = mapper<response<t>>().map(string(data: data!, encoding: nsutf8stringencoding));             let code = response?.entete?.code;             let message = response?.entete?.message;             if(code == 0)             {                 self.callback.onsuccess(data: (response?.corp)!);             }             else             {                 let error = nserror(domain: "connectionhandler", code: code!, userinfo: nsdictionary(object: message!, forkey: nslocalizeddescriptionkey) [nsobject : anyobject]);                 self.callback.onfailure(error: error);             }         });          task.resume();             }  } 

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//callback.swift import objectmapper import foundation  class callback<t: basemodel> {     let onsuccess: (data : t) -> ()     let onfailure: (error : nserror) -> ()      init(onsuccess: (data : t) -> (), onfailure: (error : nserror) -> ())     {         self.onfailure = onfailure         self.onsuccess = onsuccess     } }