title: Sorting a list of a custom type
body: <p>I want to have a stl <code>list</code> of objects where each object contains two <code>int</code>'s.
  Afterwards I want to sort the list with <code>stl::sort</code> after the value of the first <code>int</code>.
  How do I tell the sort function that it's supposed to sort after the first <code>int</code>?</p>