title: cocos2d-x using_ns_cc
body: <p>I need to know what is the functionality of this sentence in Cocos2D-X in C++:</p>
  
  <pre><code>USING_NS_CC
  </code></pre>
  
  <p>Example in code:</p>
  
  <pre><code>#include "HelloWorldScene.h"
  #include "SimpleAudioEngine.h"
  #include "GameOverScene.h"
  
  USING_NS_CC;
  
  HelloWorld::~HelloWorld()
  {
      if (_targets)
      {
          _targets-&gt;release();
          _targets = NULL;
      }
  
      if (_projectiles)
      {
          _projectiles-&gt;release();
          _projectiles = NULL;
      }
  
      // cpp don't need to call super dealloc
      // virtual destructor will do this
  }
  </code></pre>