title: What is The Rule of Three?
body: <ul>
  <li>What does <em>copying an object</em> mean?</li>
  <li>What are the <em>copy constructor</em> and the <em>copy assignment operator</em>?</li>
  <li>When do I need to declare them myself?</li>
  <li>How can I prevent my objects from being copied?</li>
  </ul>