title: What is pointer stability?
body: <p>The second paragraph in this <a href="https://abseil.io/docs/cpp/guides/container" rel="noreferrer">link</a> on Abseil containers says:</p>
  
  <blockquote>
    <p>For example, the Abseil containers often do not guarantee pointer stability after insertions or deletions.</p>
  </blockquote>
  
  <p>What does pointer stability mean in this context?</p>