title: Boost - unordered_set tutorial/examples/ANYTHING?
body: <p>I'd like to use <code>unordered_set</code> in a project. </p>
  
  <p>However, documentation for it is either incomplete or just a technical reference, no examples.</p>
  
  <p>Can anyone provide links to online resources which deal with it? Books also welcome, preferably free. Google searching returned nothing of value.</p>
  
  <p>Thanks!</p>