title: Use of -> in a template in order to force the following symbol to be dependent
body: <p>From the question:</p>
  
  <p><a href="https://stackoverflow.com/questions/8299674/propper-use-of-this">Proper use of this-&gt;</a></p>
  
  <p>The answer states that -> can be used</p>
  
  <blockquote>
    <p>...in a template, in order to force the following symbol to be
    dependent—in this latter use, it is often unavoidable.</p>
  </blockquote>
  
  <p>What does this mean what what would a good example of this use be?  I don't quite what "dependent" means in this context, but it sounds like a useful trick.</p>