title: std::queue iteration
body: <p>I need to iterate over <code>std::queue</code>.
  www.cplusplus.com says:</p>
  
  <blockquote>
    <p>By default, if no container class is specified for a particular queue class, the standard container class template deque is used.</p>
  </blockquote>
  
  <p>So can I somehow get to the queue's underlying deque and iterate over it?</p>