title: Accessing Parent Namespace in C++
body: <p>I've got a scenario like the following:</p>
  
  <pre><code>class criterion 
  {
  // stuff about criteria...
  };
  namespace hex {
  
       class criterion : public criterion //does not compile
       {                                  //This should inherit from the
       //A hex specific criterion         //criterion class in the global namespace
       };
  
  };
  </code></pre>
  
  <p>My question is -- how does one inherit from a class in a namspace which is the parent of another namespace?</p>
  
  <p>Billy3</p>