Problems with inheritance in the STL : <p>In <a href="http://www.stepanovpapers.com/notes.pdf">http://www.stepanovpapers.com/notes.pdf</a>, Alexander Stepanov mentions:</p>

<blockquote>
  <p>It is interesting to note that the only examples of inheritance that
  remained in STL inherit from empty classes. Originally, there were
  many uses of inheritance inside the containers and even iterators, but
  they had to be removed because of the problems they caused.</p>
</blockquote>

<p>What are the technical problems that precluded the use of inheritance in the STL?</p>
