title: Is there a quick way to create a set?
body: <p>Currently I'm creating a new set like this:</p>
  
  <pre><code>    std::set&lt;A&gt; s;
      s.insert(a1);
      s.insert(a2);
      s.insert(a3);
      ...
      s.insert(a10);
  </code></pre>
  
  <p>Is there a way to create <code>s</code> in one line?</p>