Promisify QT callbacks to angularjs promise

[TejaswiniUL]

Hi Folks,
I have started learning AngularJS and QT by my own. And I'm trying to write a promisify function that QT uses to an angularjs $q promise, but can't seem to get my head around it.

The QT promises are something like:

method(arg, arg, callback);

so if C++ had a method that would concatenate two strings the call would be:

method('A', 'B', function(result) {
  console.log(result);  //would print 'AB'
});

I'd like to be able to promisify this method so something like this would work:

var promiseMethod = $q.promisify(method);

promiseMethod('A', 'B')
  .then(result) {
     console.log(result);
  }

I started adding my decorator, but can't seem to get the actual method calls correct:

.config(function($provide) {
      $provide.decorator('$q', function($delegate, $rootScope) {
        $delegate.qtPromisify = function(fn) {

          /// ARGH!  what goes here!, this don't work.
          return function() {
            var args = Array.prototype.slice.call(arguments);
            return $delegate(function(resolve, reject) {
              var result = fn.apply(null, args);
              resolve(result);
            });
          }
        };
        return $delegate;
      });
    })

Can anyone share your suggestions on this??

Thanks & Regards
Tejaswini