title: Multiple aliases for a namespace?
body: <p>Is it possible to have a namespace that has all the declarations of more than one other namespace? Like this:</p>
  
  <pre><code>namespace std {...};
  namespace glm {...};
  
  namespace mynamespace = std; //mynamespace is an alias for std
  namespace mynamespace += glm; //mynamespace will hold glm functions as well.
  </code></pre>