title: Need help to make sense of NDKHelper
body: <p><a href="http://www.cocos2d-x.org/projects/cocos2d-x/wiki/How_to_work_on_iOS_-_C++Objective-C" rel="nofollow">Here</a> is the tutorial on how to call back and forth between c++ to object-c .</p>
  
  <p>But isn't object-c compatible with c++ in the first place?</p>
  
  <p>We can put c++ and object-c together directly, why the hard way around?</p>