n><span class=special>.</span><span class=identifier>y0</span><span class=special>);</span>
<span class=special>}</span>

<span class=keyword>typedef</span> <span class=identifier>multi_index_container</span><span class=special>&lt;</span>
  <span class=identifier>rectangle</span><span class=special>,</span>
  <span class=identifier>indexed_by</span><span class=special>&lt;</span>
    <span class=comment>// sort by increasing area</span>
    <span class=identifier>ordered_non_unique</span><span class=specia