As an emacs C++ user YouCompleteMe is the only VIM plugin that makes me jealous. I want the code navigation and completion you get with VS or XCode but within emacs. I know there are other plugins that try to do this, but as the author mentioned, all the repeated works leads to an overall mediocre results in most cases.
Maybe the front end of something like irony-mode [0] can be adapted to use the YouCompleteMe backend.