ecial">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">box</span><span class="special">,</span> <span class="keyword">unsigned</span><span class="special">&gt;</span> <span class="identifier">value</span><span class="special">;</span>
</pre>
<p>
      </p>
<p>
        R-tree may be created using various algorithm and parameters. You should
        choose the algorithm you'll find the best for your purpose. In this example
        we will use quadratic a